coffeescript/lib/coffee-script/nodes.js

// Generated by CoffeeScript 2.0.0-alpha
(function() {
  var Access, Arr, Assign, AwaitReturn, Base, Block, BooleanLiteral, Call, Class, Code, CodeFragment, Comment, ExecutableClassBody, Existence, Expansion, ExportAllDeclaration, ExportDeclaration, ExportDefaultDeclaration, ExportNamedDeclaration, ExportSpecifier, ExportSpecifierList, Extends, For, HoistTarget, IdentifierLiteral, If, ImportClause, ImportDeclaration, ImportDefaultSpecifier, ImportNamespaceSpecifier, ImportSpecifier, ImportSpecifierList, In, Index, InfinityLiteral, JS_FORBIDDEN, LEVEL_ACCESS, LEVEL_COND, LEVEL_LIST, LEVEL_OP, LEVEL_PAREN, LEVEL_TOP, Literal, ModuleDeclaration, ModuleSpecifier, ModuleSpecifierList, NEGATE, NO, NaNLiteral, NullLiteral, NumberLiteral, Obj, Op, Param, Parens, PassthroughLiteral, PropertyName, Range, RegexLiteral, RegexWithInterpolations, Return, SIMPLENUM, Scope, Slice, Splat, StatementLiteral, StringLiteral, StringWithInterpolations, SuperCall, Switch, TAB, THIS, TaggedTemplateCall, ThisLiteral, Throw, Try, UTILITIES, UndefinedLiteral, Value, While, YES, YieldReturn, addLocationDataFn, compact, del, ends, extend, flatten, fragmentsToText, isComplexOrAssignable, isLiteralArguments, isLiteralThis, isUnassignable, locationDataToString, merge, multident, ref1, ref2, some, starts, throwSyntaxError, unfoldSoak, utility,
    indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; },
    slice = [].slice;

  Error.stackTraceLimit = 2e308;

  Scope = require('./scope').Scope;

  ref1 = require('./lexer'), isUnassignable = ref1.isUnassignable, JS_FORBIDDEN = ref1.JS_FORBIDDEN;

  ref2 = require('./helpers'), compact = ref2.compact, flatten = ref2.flatten, extend = ref2.extend, merge = ref2.merge, del = ref2.del, starts = ref2.starts, ends = ref2.ends, some = ref2.some, addLocationDataFn = ref2.addLocationDataFn, locationDataToString = ref2.locationDataToString, throwSyntaxError = ref2.throwSyntaxError;

  exports.extend = extend;

  exports.addLocationDataFn = addLocationDataFn;

  YES = function() {
    return true;
  };

  NO = function() {
    return false;
  };

  THIS = function() {
    return this;
  };

  NEGATE = function() {
    this.negated = !this.negated;
    return this;
  };

  exports.CodeFragment = CodeFragment = class CodeFragment {
    constructor(parent, code) {
      var ref3;
      this.code = `${code}`;
      this.locationData = parent != null ? parent.locationData : void 0;
      this.type = (parent != null ? (ref3 = parent.constructor) != null ? ref3.name : void 0 : void 0) || 'unknown';
    }

    toString() {
      return `${this.code}${(this.locationData ? ": " + locationDataToString(this.locationData) : '')}`;
    }

  };

  fragmentsToText = function(fragments) {
    var fragment;
    return ((function() {
      var j, len1, results;
      results = [];
      for (j = 0, len1 = fragments.length; j < len1; j++) {
        fragment = fragments[j];
        results.push(fragment.code);
      }
      return results;
    })()).join('');
  };

  exports.Base = Base = (function() {
    class Base {
      compile(o, lvl) {
        return fragmentsToText(this.compileToFragments(o, lvl));
      }

      compileToFragments(o, lvl) {
        var node;
        o = extend({}, o);
        if (lvl) {
          o.level = lvl;
        }
        node = this.unfoldSoak(o) || this;
        node.tab = o.indent;
        if (o.level === LEVEL_TOP || !node.isStatement(o)) {
          return node.compileNode(o);
        } else {
          return node.compileClosure(o);
        }
      }

      compileClosure(o) {
        var args, argumentsNode, func, jumpNode, meth, parts, ref3, ref4;
        if (jumpNode = this.jumps()) {
          jumpNode.error('cannot use a pure statement in an expression');
        }
        o.sharedScope = true;
        func = new Code([], Block.wrap([this]));
        args = [];
        if ((argumentsNode = this.contains(isLiteralArguments)) || this.contains(isLiteralThis)) {
          args = [new ThisLiteral];
          if (argumentsNode) {
            meth = 'apply';
            args.push(new IdentifierLiteral('arguments'));
          } else {
            meth = 'call';
          }
          func = new Value(func, [new Access(new PropertyName(meth))]);
        }
        parts = (new Call(func, args)).compileNode(o);
        switch (false) {
          case !(func.isGenerator || ((ref3 = func.base) != null ? ref3.isGenerator : void 0)):
            parts.unshift(this.makeCode("(yield* "));
            parts.push(this.makeCode(")"));
            break;
          case !(func.isAsync || ((ref4 = func.base) != null ? ref4.isAsync : void 0)):
            parts.unshift(this.makeCode("(await "));
            parts.push(this.makeCode(")"));
        }
        return parts;
      }

      cache(o, level, isComplex) {
        var complex, ref, sub;
        complex = isComplex != null ? isComplex(this) : this.isComplex();
        if (complex) {
          ref = new IdentifierLiteral(o.scope.freeVariable('ref'));
          sub = new Assign(ref, this);
          if (level) {
            return [sub.compileToFragments(o, level), [this.makeCode(ref.value)]];
          } else {
            return [sub, ref];
          }
        } else {
          ref = level ? this.compileToFragments(o, level) : this;
          return [ref, ref];
        }
      }

      hoist() {
        var compileNode, compileToFragments, target;
        this.hoisted = true;
        target = new HoistTarget(this);
        compileNode = this.compileNode;
        compileToFragments = this.compileToFragments;
        this.compileNode = function(o) {
          return target.update(compileNode, o);
        };
        this.compileToFragments = function(o) {
          return target.update(compileToFragments, o);
        };
        return target;
      }

      cacheToCodeFragments(cacheValues) {
        return [fragmentsToText(cacheValues[0]), fragmentsToText(cacheValues[1])];
      }

      makeReturn(res) {
        var me;
        me = this.unwrapAll();
        if (res) {
          return new Call(new Literal(`${res}.push`), [me]);
        } else {
          return new Return(me);
        }
      }

      contains(pred) {
        var node;
        node = void 0;
        this.traverseChildren(false, function(n) {
          if (pred(n)) {
            node = n;
            return false;
          }
        });
        return node;
      }

      lastNonComment(list) {
        var i;
        i = list.length;
        while (i--) {
          if (!(list[i] instanceof Comment)) {
            return list[i];
          }
        }
        return null;
      }

      toString(idt = '', name = this.constructor.name) {
        var tree;
        tree = '\n' + idt + name;
        if (this.soak) {
          tree += '?';
        }
        this.eachChild(function(node) {
          return tree += node.toString(idt + TAB);
        });
        return tree;
      }

      eachChild(func) {
        var attr, child, j, k, len1, len2, ref3, ref4;
        if (!this.children) {
          return this;
        }
        ref3 = this.children;
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          attr = ref3[j];
          if (this[attr]) {
            ref4 = flatten([this[attr]]);
            for (k = 0, len2 = ref4.length; k < len2; k++) {
              child = ref4[k];
              if (func(child) === false) {
                return this;
              }
            }
          }
        }
        return this;
      }

      traverseChildren(crossScope, func) {
        return this.eachChild(function(child) {
          var recur;
          recur = func(child);
          if (recur !== false) {
            return child.traverseChildren(crossScope, func);
          }
        });
      }

      replaceInContext(match, replacement) {
        var attr, child, children, i, j, k, len1, len2, ref3, ref4;
        if (!this.children) {
          return false;
        }
        ref3 = this.children;
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          attr = ref3[j];
          if (children = this[attr]) {
            if (Array.isArray(children)) {
              for (i = k = 0, len2 = children.length; k < len2; i = ++k) {
                child = children[i];
                if (match(child)) {
                  [].splice.apply(children, [i, i - i + 1].concat(ref4 = replacement(child, this))), ref4;
                  return true;
                } else {
                  if (child.replaceInContext(match, replacement)) {
                    return true;
                  }
                }
              }
            } else if (match(children)) {
              this[attr] = replacement(children, this);
              return true;
            } else {
              if (children.replaceInContext(match, replacement)) {
                return true;
              }
            }
          }
        }
      }

      invert() {
        return new Op('!', this);
      }

      unwrapAll() {
        var node;
        node = this;
        while (node !== (node = node.unwrap())) {
          continue;
        }
        return node;
      }

      updateLocationDataIfMissing(locationData) {
        if (this.locationData) {
          return this;
        }
        this.locationData = locationData;
        return this.eachChild(function(child) {
          return child.updateLocationDataIfMissing(locationData);
        });
      }

      error(message) {
        return throwSyntaxError(message, this.locationData);
      }

      makeCode(code) {
        return new CodeFragment(this, code);
      }

      wrapInBraces(fragments) {
        return [].concat(this.makeCode('('), fragments, this.makeCode(')'));
      }

      joinFragmentArrays(fragmentsList, joinStr) {
        var answer, fragments, i, j, len1;
        answer = [];
        for (i = j = 0, len1 = fragmentsList.length; j < len1; i = ++j) {
          fragments = fragmentsList[i];
          if (i) {
            answer.push(this.makeCode(joinStr));
          }
          answer = answer.concat(fragments);
        }
        return answer;
      }

    };

    Base.prototype.children = [];

    Base.prototype.isStatement = NO;

    Base.prototype.jumps = NO;

    Base.prototype.isComplex = YES;

    Base.prototype.isChainable = NO;

    Base.prototype.isAssignable = NO;

    Base.prototype.isNumber = NO;

    Base.prototype.unwrap = THIS;

    Base.prototype.unfoldSoak = NO;

    Base.prototype.assigns = NO;

    return Base;

  })();

  exports.HoistTarget = HoistTarget = (function(superClass) {
    class HoistTarget extends superClass {
      static expand(fragments) {
        var fragment, i, j, ref3;
        for (i = j = fragments.length - 1; j >= 0; i = j += -1) {
          fragment = fragments[i];
          if (fragment.fragments) {
            [].splice.apply(fragments, [i, i - i + 1].concat(ref3 = this.expand(fragment.fragments))), ref3;
          }
        }
        return fragments;
      }

      constructor(source1) {
        super();
        this.source = source1;
        this.options = {};
        this.targetFragments = {
          fragments: []
        };
      }

      isStatement(o) {
        return this.source.isStatement(o);
      }

      update(compile, o) {
        return this.targetFragments.fragments = compile.call(this.source, merge(o, this.options));
      }

      compileToFragments(o, level) {
        this.options.indent = o.indent;
        this.options.level = level != null ? level : o.level;
        return [this.targetFragments];
      }

      compileNode(o) {
        return this.compileToFragments(o);
      }

      compileClosure(o) {
        return this.compileToFragments(o);
      }

    };

    HoistTarget.__super__ = superClass.prototype;

    return HoistTarget;

  })(Base);

  exports.Block = Block = (function(superClass) {
    class Block extends superClass {
      constructor(nodes) {
        super();
        this.expressions = compact(flatten(nodes || []));
      }

      push(node) {
        this.expressions.push(node);
        return this;
      }

      pop() {
        return this.expressions.pop();
      }

      unshift(node) {
        this.expressions.unshift(node);
        return this;
      }

      unwrap() {
        if (this.expressions.length === 1) {
          return this.expressions[0];
        } else {
          return this;
        }
      }

      isEmpty() {
        return !this.expressions.length;
      }

      isStatement(o) {
        var exp, j, len1, ref3;
        ref3 = this.expressions;
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          exp = ref3[j];
          if (exp.isStatement(o)) {
            return true;
          }
        }
        return false;
      }

      jumps(o) {
        var exp, j, jumpNode, len1, ref3;
        ref3 = this.expressions;
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          exp = ref3[j];
          if (jumpNode = exp.jumps(o)) {
            return jumpNode;
          }
        }
      }

      makeReturn(res) {
        var expr, len;
        len = this.expressions.length;
        while (len--) {
          expr = this.expressions[len];
          if (!(expr instanceof Comment)) {
            this.expressions[len] = expr.makeReturn(res);
            if (expr instanceof Return && !expr.expression) {
              this.expressions.splice(len, 1);
            }
            break;
          }
        }
        return this;
      }

      compileToFragments(o = {}, level) {
        if (o.scope) {
          return Block.__super__.compileToFragments.call(this, o, level);
        } else {
          return this.compileRoot(o);
        }
      }

      compileNode(o) {
        var answer, compiledNodes, fragments, index, j, len1, node, ref3, top;
        this.tab = o.indent;
        top = o.level === LEVEL_TOP;
        compiledNodes = [];
        ref3 = this.expressions;
        for (index = j = 0, len1 = ref3.length; j < len1; index = ++j) {
          node = ref3[index];
          node = node.unwrapAll();
          node = node.unfoldSoak(o) || node;
          if (node instanceof Block) {
            compiledNodes.push(node.compileNode(o));
          } else if (node.hoisted) {
            node.compileToFragments(o);
          } else if (top) {
            node.front = true;
            fragments = node.compileToFragments(o);
            if (!node.isStatement(o)) {
              fragments.unshift(this.makeCode(`${this.tab}`));
              fragments.push(this.makeCode(";"));
            }
            compiledNodes.push(fragments);
          } else {
            compiledNodes.push(node.compileToFragments(o, LEVEL_LIST));
          }
        }
        if (top) {
          if (this.spaced) {
            return [].concat(this.joinFragmentArrays(compiledNodes, '\n\n'), this.makeCode("\n"));
          } else {
            return this.joinFragmentArrays(compiledNodes, '\n');
          }
        }
        if (compiledNodes.length) {
          answer = this.joinFragmentArrays(compiledNodes, ', ');
        } else {
          answer = [this.makeCode("void 0")];
        }
        if (compiledNodes.length > 1 && o.level >= LEVEL_LIST) {
          return this.wrapInBraces(answer);
        } else {
          return answer;
        }
      }

      compileRoot(o) {
        var exp, fragments, i, j, len1, name, prelude, preludeExps, ref3, ref4, rest;
        o.indent = o.bare ? '' : TAB;
        o.level = LEVEL_TOP;
        this.spaced = true;
        o.scope = new Scope(null, this, null, (ref3 = o.referencedVars) != null ? ref3 : []);
        ref4 = o.locals || [];
        for (j = 0, len1 = ref4.length; j < len1; j++) {
          name = ref4[j];
          o.scope.parameter(name);
        }
        prelude = [];
        if (!o.bare) {
          preludeExps = (function() {
            var k, len2, ref5, results;
            ref5 = this.expressions;
            results = [];
            for (i = k = 0, len2 = ref5.length; k < len2; i = ++k) {
              exp = ref5[i];
              if (!(exp.unwrap() instanceof Comment)) {
                break;
              }
              results.push(exp);
            }
            return results;
          }).call(this);
          rest = this.expressions.slice(preludeExps.length);
          this.expressions = preludeExps;
          if (preludeExps.length) {
            prelude = this.compileNode(merge(o, {
              indent: ''
            }));
            prelude.push(this.makeCode("\n"));
          }
          this.expressions = rest;
        }
        fragments = this.compileWithDeclarations(o);
        HoistTarget.expand(fragments);
        if (o.bare) {
          return fragments;
        }
        return [].concat(prelude, this.makeCode("(function() {\n"), fragments, this.makeCode("\n}).call(this);\n"));
      }

      compileWithDeclarations(o) {
        var assigns, declars, exp, fragments, i, j, len1, post, ref3, ref4, ref5, rest, scope, spaced;
        fragments = [];
        post = [];
        ref3 = this.expressions;
        for (i = j = 0, len1 = ref3.length; j < len1; i = ++j) {
          exp = ref3[i];
          exp = exp.unwrap();
          if (!(exp instanceof Comment || exp instanceof Literal)) {
            break;
          }
        }
        o = merge(o, {
          level: LEVEL_TOP
        });
        if (i) {
          rest = this.expressions.splice(i, 9e9);
          ref4 = [this.spaced, false], spaced = ref4[0], this.spaced = ref4[1];
          ref5 = [this.compileNode(o), spaced], fragments = ref5[0], this.spaced = ref5[1];
          this.expressions = rest;
        }
        post = this.compileNode(o);
        scope = o.scope;
        if (scope.expressions === this) {
          declars = o.scope.hasDeclarations();
          assigns = scope.hasAssignments;
          if (declars || assigns) {
            if (i) {
              fragments.push(this.makeCode('\n'));
            }
            fragments.push(this.makeCode(`${this.tab}var `));
            if (declars) {
              fragments.push(this.makeCode(scope.declaredVariables().join(', ')));
            }
            if (assigns) {
              if (declars) {
                fragments.push(this.makeCode(`,\n${this.tab + TAB}`));
              }
              fragments.push(this.makeCode(scope.assignedVariables().join(`,\n${this.tab + TAB}`)));
            }
            fragments.push(this.makeCode(`;\n${(this.spaced ? '\n' : '')}`));
          } else if (fragments.length && post.length) {
            fragments.push(this.makeCode("\n"));
          }
        }
        return fragments.concat(post);
      }

      static wrap(nodes) {
        if (nodes.length === 1 && nodes[0] instanceof Block) {
          return nodes[0];
        }
        return new Block(nodes);
      }

    };

    Block.__super__ = superClass.prototype;

    Block.prototype.children = ['expressions'];

    return Block;

  })(Base);

  exports.Literal = Literal = (function(superClass) {
    class Literal extends superClass {
      constructor(value1) {
        super();
        this.value = value1;
      }

      assigns(name) {
        return name === this.value;
      }

      compileNode(o) {
        return [this.makeCode(this.value)];
      }

      toString() {
        return ` ${(this.isStatement() ? Literal.__super__.toString.call(this, ...arguments) : this.constructor.name)}: ${this.value}`;
      }

    };

    Literal.__super__ = superClass.prototype;

    Literal.prototype.isComplex = NO;

    return Literal;

  })(Base);

  exports.NumberLiteral = NumberLiteral = (function(superClass) {
    class NumberLiteral extends superClass {};

    NumberLiteral.__super__ = superClass.prototype;

    return NumberLiteral;

  })(Literal);

  exports.InfinityLiteral = InfinityLiteral = (function(superClass) {
    class InfinityLiteral extends superClass {
      compileNode() {
        return [this.makeCode('2e308')];
      }

    };

    InfinityLiteral.__super__ = superClass.prototype;

    return InfinityLiteral;

  })(NumberLiteral);

  exports.NaNLiteral = NaNLiteral = (function(superClass) {
    class NaNLiteral extends superClass {
      constructor() {
        super('NaN');
      }

      compileNode(o) {
        var code;
        code = [this.makeCode('0/0')];
        if (o.level >= LEVEL_OP) {
          return this.wrapInBraces(code);
        } else {
          return code;
        }
      }

    };

    NaNLiteral.__super__ = superClass.prototype;

    return NaNLiteral;

  })(NumberLiteral);

  exports.StringLiteral = StringLiteral = (function(superClass) {
    class StringLiteral extends superClass {};

    StringLiteral.__super__ = superClass.prototype;

    return StringLiteral;

  })(Literal);

  exports.RegexLiteral = RegexLiteral = (function(superClass) {
    class RegexLiteral extends superClass {};

    RegexLiteral.__super__ = superClass.prototype;

    return RegexLiteral;

  })(Literal);

  exports.PassthroughLiteral = PassthroughLiteral = (function(superClass) {
    class PassthroughLiteral extends superClass {};

    PassthroughLiteral.__super__ = superClass.prototype;

    return PassthroughLiteral;

  })(Literal);

  exports.IdentifierLiteral = IdentifierLiteral = (function(superClass) {
    class IdentifierLiteral extends superClass {};

    IdentifierLiteral.__super__ = superClass.prototype;

    IdentifierLiteral.prototype.isAssignable = YES;

    return IdentifierLiteral;

  })(Literal);

  exports.PropertyName = PropertyName = (function(superClass) {
    class PropertyName extends superClass {};

    PropertyName.__super__ = superClass.prototype;

    PropertyName.prototype.isAssignable = YES;

    return PropertyName;

  })(Literal);

  exports.StatementLiteral = StatementLiteral = (function(superClass) {
    class StatementLiteral extends superClass {
      jumps(o) {
        if (this.value === 'break' && !((o != null ? o.loop : void 0) || (o != null ? o.block : void 0))) {
          return this;
        }
        if (this.value === 'continue' && !(o != null ? o.loop : void 0)) {
          return this;
        }
      }

      compileNode(o) {
        return [this.makeCode(`${this.tab}${this.value};`)];
      }

    };

    StatementLiteral.__super__ = superClass.prototype;

    StatementLiteral.prototype.isStatement = YES;

    StatementLiteral.prototype.makeReturn = THIS;

    return StatementLiteral;

  })(Literal);

  exports.ThisLiteral = ThisLiteral = (function(superClass) {
    class ThisLiteral extends superClass {
      constructor() {
        super('this');
      }

      compileNode(o) {
        var code, ref3;
        code = ((ref3 = o.scope.method) != null ? ref3.bound : void 0) ? o.scope.method.context : this.value;
        return [this.makeCode(code)];
      }

    };

    ThisLiteral.__super__ = superClass.prototype;

    return ThisLiteral;

  })(Literal);

  exports.UndefinedLiteral = UndefinedLiteral = (function(superClass) {
    class UndefinedLiteral extends superClass {
      constructor() {
        super('undefined');
      }

      compileNode(o) {
        return [this.makeCode(o.level >= LEVEL_ACCESS ? '(void 0)' : 'void 0')];
      }

    };

    UndefinedLiteral.__super__ = superClass.prototype;

    return UndefinedLiteral;

  })(Literal);

  exports.NullLiteral = NullLiteral = (function(superClass) {
    class NullLiteral extends superClass {
      constructor() {
        super('null');
      }

    };

    NullLiteral.__super__ = superClass.prototype;

    return NullLiteral;

  })(Literal);

  exports.BooleanLiteral = BooleanLiteral = (function(superClass) {
    class BooleanLiteral extends superClass {};

    BooleanLiteral.__super__ = superClass.prototype;

    return BooleanLiteral;

  })(Literal);

  exports.Return = Return = (function(superClass) {
    class Return extends superClass {
      constructor(expression1) {
        super();
        this.expression = expression1;
      }

      compileToFragments(o, level) {
        var expr, ref3;
        expr = (ref3 = this.expression) != null ? ref3.makeReturn() : void 0;
        if (expr && !(expr instanceof Return)) {
          return expr.compileToFragments(o, level);
        } else {
          return Return.__super__.compileToFragments.call(this, o, level);
        }
      }

      compileNode(o) {
        var answer;
        answer = [];
        answer.push(this.makeCode(this.tab + `return${(this.expression ? " " : "")}`));
        if (this.expression) {
          answer = answer.concat(this.expression.compileToFragments(o, LEVEL_PAREN));
        }
        answer.push(this.makeCode(";"));
        return answer;
      }

    };

    Return.__super__ = superClass.prototype;

    Return.prototype.children = ['expression'];

    Return.prototype.isStatement = YES;

    Return.prototype.makeReturn = THIS;

    Return.prototype.jumps = THIS;

    return Return;

  })(Base);

  exports.YieldReturn = YieldReturn = (function(superClass) {
    class YieldReturn extends superClass {
      compileNode(o) {
        if (o.scope.parent == null) {
          this.error('yield can only occur inside functions');
        }
        return YieldReturn.__super__.compileNode.call(this, ...arguments);
      }

    };

    YieldReturn.__super__ = superClass.prototype;

    return YieldReturn;

  })(Return);

  exports.AwaitReturn = AwaitReturn = (function(superClass) {
    class AwaitReturn extends superClass {
      compileNode(o) {
        if (o.scope.parent == null) {
          this.error('await can only occur inside functions');
        }
        return AwaitReturn.__super__.compileNode.call(this, ...arguments);
      }

    };

    AwaitReturn.__super__ = superClass.prototype;

    return AwaitReturn;

  })(Return);

  exports.Value = Value = (function(superClass) {
    class Value extends superClass {
      constructor(base, props, tag) {
        if (!props && base instanceof Value) {
          return base;
        }
        super();
        this.base = base;
        this.properties = props || [];
        if (tag) {
          this[tag] = true;
        }
        return this;
      }

      add(props) {
        this.properties = this.properties.concat(props);
        return this;
      }

      hasProperties() {
        return !!this.properties.length;
      }

      bareLiteral(type) {
        return !this.properties.length && this.base instanceof type;
      }

      isArray() {
        return this.bareLiteral(Arr);
      }

      isRange() {
        return this.bareLiteral(Range);
      }

      isComplex() {
        return this.hasProperties() || this.base.isComplex();
      }

      isAssignable() {
        return this.hasProperties() || this.base.isAssignable();
      }

      isNumber() {
        return this.bareLiteral(NumberLiteral);
      }

      isString() {
        return this.bareLiteral(StringLiteral);
      }

      isRegex() {
        return this.bareLiteral(RegexLiteral);
      }

      isUndefined() {
        return this.bareLiteral(UndefinedLiteral);
      }

      isNull() {
        return this.bareLiteral(NullLiteral);
      }

      isBoolean() {
        return this.bareLiteral(BooleanLiteral);
      }

      isAtomic() {
        var j, len1, node, ref3;
        ref3 = this.properties.concat(this.base);
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          node = ref3[j];
          if (node.soak || node instanceof Call) {
            return false;
          }
        }
        return true;
      }

      isNotCallable() {
        return this.isNumber() || this.isString() || this.isRegex() || this.isArray() || this.isRange() || this.isSplice() || this.isObject() || this.isUndefined() || this.isNull() || this.isBoolean();
      }

      isStatement(o) {
        return !this.properties.length && this.base.isStatement(o);
      }

      assigns(name) {
        return !this.properties.length && this.base.assigns(name);
      }

      jumps(o) {
        return !this.properties.length && this.base.jumps(o);
      }

      isObject(onlyGenerated) {
        if (this.properties.length) {
          return false;
        }
        return (this.base instanceof Obj) && (!onlyGenerated || this.base.generated);
      }

      isSplice() {
        var lastProp, ref3;
        ref3 = this.properties, lastProp = ref3[ref3.length - 1];
        return lastProp instanceof Slice;
      }

      looksStatic(className) {
        var ref3;
        return (this["this"] || this.base instanceof ThisLiteral || this.base.value === className) && this.properties.length === 1 && ((ref3 = this.properties[0].name) != null ? ref3.value : void 0) !== 'prototype';
      }

      unwrap() {
        if (this.properties.length) {
          return this;
        } else {
          return this.base;
        }
      }

      cacheReference(o) {
        var base, bref, name, nref, ref3;
        ref3 = this.properties, name = ref3[ref3.length - 1];
        if (this.properties.length < 2 && !this.base.isComplex() && !(name != null ? name.isComplex() : void 0)) {
          return [this, this];
        }
        base = new Value(this.base, this.properties.slice(0, -1));
        if (base.isComplex()) {
          bref = new IdentifierLiteral(o.scope.freeVariable('base'));
          base = new Value(new Parens(new Assign(bref, base)));
        }
        if (!name) {
          return [base, bref];
        }
        if (name.isComplex()) {
          nref = new IdentifierLiteral(o.scope.freeVariable('name'));
          name = new Index(new Assign(nref, name.index));
          nref = new Index(nref);
        }
        return [base.add(name), new Value(bref || base.base, [nref || name])];
      }

      compileNode(o) {
        var fragments, j, len1, prop, props;
        this.base.front = this.front;
        props = this.properties;
        fragments = this.base.compileToFragments(o, (props.length ? LEVEL_ACCESS : null));
        if (props.length && SIMPLENUM.test(fragmentsToText(fragments))) {
          fragments.push(this.makeCode('.'));
        }
        for (j = 0, len1 = props.length; j < len1; j++) {
          prop = props[j];
          fragments.push(...prop.compileToFragments(o));
        }
        return fragments;
      }

      unfoldSoak(o) {
        return this.unfoldedSoak != null ? this.unfoldedSoak : this.unfoldedSoak = (() => {
          var fst, i, ifn, j, len1, prop, ref, ref3, snd;
          if (ifn = this.base.unfoldSoak(o)) {
            ifn.body.properties.push(...this.properties);
            return ifn;
          }
          ref3 = this.properties;
          for (i = j = 0, len1 = ref3.length; j < len1; i = ++j) {
            prop = ref3[i];
            if (!prop.soak) {
              continue;
            }
            prop.soak = false;
            fst = new Value(this.base, this.properties.slice(0, i));
            snd = new Value(this.base, this.properties.slice(i));
            if (fst.isComplex()) {
              ref = new IdentifierLiteral(o.scope.freeVariable('ref'));
              fst = new Parens(new Assign(ref, fst));
              snd.base = ref;
            }
            return new If(new Existence(fst), snd, {
              soak: true
            });
          }
          return false;
        })();
      }

    };

    Value.__super__ = superClass.prototype;

    Value.prototype.children = ['base', 'properties'];

    return Value;

  })(Base);

  exports.Comment = Comment = (function(superClass) {
    class Comment extends superClass {
      constructor(comment1) {
        super();
        this.comment = comment1;
      }

      compileNode(o, level) {
        var code, comment;
        comment = this.comment.replace(/^(\s*)#(?=\s)/gm, "$1 *");
        code = `/*${multident(comment, this.tab)}${(indexOf.call(comment, '\n') >= 0 ? `\n${this.tab}` : '')} */`;
        if ((level || o.level) === LEVEL_TOP) {
          code = o.indent + code;
        }
        return [this.makeCode("\n"), this.makeCode(code)];
      }

    };

    Comment.__super__ = superClass.prototype;

    Comment.prototype.isStatement = YES;

    Comment.prototype.makeReturn = THIS;

    return Comment;

  })(Base);

  exports.Call = Call = (function(superClass) {
    class Call extends superClass {
      constructor(variable1, args1 = [], soak1) {
        super();
        this.variable = variable1;
        this.args = args1;
        this.soak = soak1;
        this.isNew = false;
        if (this.variable instanceof Value && this.variable.isNotCallable()) {
          this.variable.error("literal is not a function");
        }
      }

      newInstance() {
        var base, ref3;
        base = ((ref3 = this.variable) != null ? ref3.base : void 0) || this.variable;
        if (base instanceof Call && !base.isNew) {
          base.newInstance();
        } else {
          this.isNew = true;
        }
        return this;
      }

      unfoldSoak(o) {
        var call, ifn, j, left, len1, list, ref3, ref4, rite;
        if (this.soak) {
          if (this instanceof SuperCall) {
            left = new Literal(this.superReference(o));
            rite = new Value(left);
          } else {
            if (ifn = unfoldSoak(o, this, 'variable')) {
              return ifn;
            }
            ref3 = new Value(this.variable).cacheReference(o), left = ref3[0], rite = ref3[1];
          }
          rite = new Call(rite, this.args);
          rite.isNew = this.isNew;
          left = new Literal(`typeof ${left.compile(o)} === \"function\"`);
          return new If(left, new Value(rite), {
            soak: true
          });
        }
        call = this;
        list = [];
        while (true) {
          if (call.variable instanceof Call) {
            list.push(call);
            call = call.variable;
            continue;
          }
          if (!(call.variable instanceof Value)) {
            break;
          }
          list.push(call);
          if (!((call = call.variable.base) instanceof Call)) {
            break;
          }
        }
        ref4 = list.reverse();
        for (j = 0, len1 = ref4.length; j < len1; j++) {
          call = ref4[j];
          if (ifn) {
            if (call.variable instanceof Call) {
              call.variable = ifn;
            } else {
              call.variable.base = ifn;
            }
          }
          ifn = unfoldSoak(o, call, 'variable');
        }
        return ifn;
      }

      compileNode(o) {
        var arg, argIndex, compiledArgs, fragments, j, len1, preface, ref3, ref4;
        if ((ref3 = this.variable) != null) {
          ref3.front = this.front;
        }
        compiledArgs = [];
        ref4 = this.args;
        for (argIndex = j = 0, len1 = ref4.length; j < len1; argIndex = ++j) {
          arg = ref4[argIndex];
          if (argIndex) {
            compiledArgs.push(this.makeCode(", "));
          }
          compiledArgs.push(...arg.compileToFragments(o, LEVEL_LIST));
        }
        fragments = [];
        if (this instanceof SuperCall) {
          preface = this.superReference(o);
          if (preface === 'super') {
            preface += '(';
          } else {
            preface += `.call(${this.superThis(o)}`;
            if (compiledArgs.length) {
              preface += ", ";
            }
          }
          fragments.push(this.makeCode(preface));
        } else {
          if (this.isNew) {
            fragments.push(this.makeCode('new '));
          }
          fragments.push(...this.variable.compileToFragments(o, LEVEL_ACCESS));
          fragments.push(this.makeCode("("));
        }
        fragments.push(...compiledArgs);
        fragments.push(this.makeCode(")"));
        return fragments;
      }

    };

    Call.__super__ = superClass.prototype;

    Call.prototype.children = ['variable', 'args'];

    return Call;

  })(Base);

  exports.SuperCall = SuperCall = (function(superClass) {
    class SuperCall extends superClass {
      constructor(args) {
        super(null, args != null ? args : [new Splat(new IdentifierLiteral('arguments'))]);
        this.isBare = args != null;
      }

      isStatement(o) {
        var ref3;
        return ((ref3 = this.expressions) != null ? ref3.length : void 0) && o.level === LEVEL_TOP;
      }

      compileNode(o) {
        var ref, ref3, ref4, replacement, superCall;
        if (!((ref3 = this.expressions) != null ? ref3.length : void 0)) {
          return SuperCall.__super__.compileNode.call(this, ...arguments);
        }
        superCall = new Literal(fragmentsToText(SuperCall.__super__.compileNode.call(this, ...arguments)));
        replacement = new Block(this.expressions.slice());
        if (o.level > LEVEL_TOP) {
          ref4 = superCall.cache(o, null, YES), superCall = ref4[0], ref = ref4[1];
          replacement.push(ref);
        }
        replacement.unshift(superCall);
        return replacement.compileToFragments(o, o.level === LEVEL_TOP ? o.level : LEVEL_LIST);
      }

      superReference(o) {
        var accesses, base, bref, klass, method, name, nref, variable;
        method = o.scope.namedMethod();
        if (method != null ? method.ctor : void 0) {
          return 'super';
        } else if (method != null ? method.klass : void 0) {
          klass = method.klass, name = method.name, variable = method.variable;
          if (klass.isComplex()) {
            bref = new IdentifierLiteral(o.scope.parent.freeVariable('base'));
            base = new Value(new Parens(new Assign(bref, klass)));
            variable.base = base;
            variable.properties.splice(0, klass.properties.length);
          }
          if (name.isComplex() || (name instanceof Index && name.index.isAssignable())) {
            nref = new IdentifierLiteral(o.scope.parent.freeVariable('name'));
            name.index = new Assign(nref, name.index);
          }
          accesses = [new Access(new PropertyName('__super__'))];
          if (method.isStatic) {
            accesses.push(new Access(new PropertyName('constructor')));
          }
          accesses.push(nref != null ? new Index(nref) : name);
          return (new Value(bref != null ? bref : klass, accesses)).compile(o);
        } else {
          return this.error('cannot call super outside of an instance method.');
        }
      }

      superThis(o) {
        var method;
        method = o.scope.method;
        return (method && !method.klass && method.context) || "this";
      }

    };

    SuperCall.__super__ = superClass.prototype;

    SuperCall.prototype.children = ['expressions'];

    return SuperCall;

  })(Call);

  exports.RegexWithInterpolations = RegexWithInterpolations = (function(superClass) {
    class RegexWithInterpolations extends superClass {
      constructor(args = []) {
        super(new Value(new IdentifierLiteral('RegExp')), args, false);
      }

    };

    RegexWithInterpolations.__super__ = superClass.prototype;

    return RegexWithInterpolations;

  })(Call);

  exports.TaggedTemplateCall = TaggedTemplateCall = (function(superClass) {
    class TaggedTemplateCall extends superClass {
      constructor(variable, arg, soak) {
        if (arg instanceof StringLiteral) {
          arg = new StringWithInterpolations(Block.wrap([new Value(arg)]));
        }
        super(variable, [arg], soak);
      }

      compileNode(o) {
        return this.variable.compileToFragments(o, LEVEL_ACCESS).concat(this.args[0].compileToFragments(o, LEVEL_LIST));
      }

    };

    TaggedTemplateCall.__super__ = superClass.prototype;

    return TaggedTemplateCall;

  })(Call);

  exports.Extends = Extends = (function(superClass) {
    class Extends extends superClass {
      constructor(child1, parent1) {
        super();
        this.child = child1;
        this.parent = parent1;
      }

      compileToFragments(o) {
        return new Call(new Value(new Literal(utility('extend', o))), [this.child, this.parent]).compileToFragments(o);
      }

    };

    Extends.__super__ = superClass.prototype;

    Extends.prototype.children = ['child', 'parent'];

    return Extends;

  })(Base);

  exports.Access = Access = (function(superClass) {
    class Access extends superClass {
      constructor(name1, tag) {
        super();
        this.name = name1;
        this.soak = tag === 'soak';
      }

      compileToFragments(o) {
        var name, node, ref3;
        name = this.name.compileToFragments(o);
        node = this.name.unwrap();
        if (node instanceof PropertyName) {
          if (ref3 = node.value, indexOf.call(JS_FORBIDDEN, ref3) >= 0) {
            return [this.makeCode('["'), ...name, this.makeCode('"]')];
          } else {
            return [this.makeCode('.'), ...name];
          }
        } else {
          return [this.makeCode('['), ...name, this.makeCode(']')];
        }
      }

    };

    Access.__super__ = superClass.prototype;

    Access.prototype.children = ['name'];

    Access.prototype.isComplex = NO;

    return Access;

  })(Base);

  exports.Index = Index = (function(superClass) {
    class Index extends superClass {
      constructor(index1) {
        super();
        this.index = index1;
      }

      compileToFragments(o) {
        return [].concat(this.makeCode("["), this.index.compileToFragments(o, LEVEL_PAREN), this.makeCode("]"));
      }

      isComplex() {
        return this.index.isComplex();
      }

    };

    Index.__super__ = superClass.prototype;

    Index.prototype.children = ['index'];

    return Index;

  })(Base);

  exports.Range = Range = (function(superClass) {
    class Range extends superClass {
      constructor(from1, to1, tag) {
        super();
        this.from = from1;
        this.to = to1;
        this.exclusive = tag === 'exclusive';
        this.equals = this.exclusive ? '' : '=';
      }

      compileVariables(o) {
        var isComplex, ref3, ref4, ref5, step;
        o = merge(o, {
          top: true
        });
        isComplex = del(o, 'isComplex');
        ref3 = this.cacheToCodeFragments(this.from.cache(o, LEVEL_LIST, isComplex)), this.fromC = ref3[0], this.fromVar = ref3[1];
        ref4 = this.cacheToCodeFragments(this.to.cache(o, LEVEL_LIST, isComplex)), this.toC = ref4[0], this.toVar = ref4[1];
        if (step = del(o, 'step')) {
          ref5 = this.cacheToCodeFragments(step.cache(o, LEVEL_LIST, isComplex)), this.step = ref5[0], this.stepVar = ref5[1];
        }
        this.fromNum = this.from.isNumber() ? Number(this.fromVar) : null;
        this.toNum = this.to.isNumber() ? Number(this.toVar) : null;
        return this.stepNum = (step != null ? step.isNumber() : void 0) ? Number(this.stepVar) : null;
      }

      compileNode(o) {
        var cond, condPart, from, gt, idx, idxName, known, lt, namedIndex, ref3, ref4, stepPart, to, varPart;
        if (!this.fromVar) {
          this.compileVariables(o);
        }
        if (!o.index) {
          return this.compileArray(o);
        }
        known = (this.fromNum != null) && (this.toNum != null);
        idx = del(o, 'index');
        idxName = del(o, 'name');
        namedIndex = idxName && idxName !== idx;
        varPart = `${idx} = ${this.fromC}`;
        if (this.toC !== this.toVar) {
          varPart += `, ${this.toC}`;
        }
        if (this.step !== this.stepVar) {
          varPart += `, ${this.step}`;
        }
        ref3 = [`${idx} <${this.equals}`, `${idx} >${this.equals}`], lt = ref3[0], gt = ref3[1];
        condPart = this.stepNum != null ? this.stepNum > 0 ? `${lt} ${this.toVar}` : `${gt} ${this.toVar}` : known ? ((ref4 = [this.fromNum, this.toNum], from = ref4[0], to = ref4[1], ref4), from <= to ? `${lt} ${to}` : `${gt} ${to}`) : (cond = this.stepVar ? `${this.stepVar} > 0` : `${this.fromVar} <= ${this.toVar}`, `${cond} ? ${lt} ${this.toVar} : ${gt} ${this.toVar}`);
        stepPart = this.stepVar ? `${idx} += ${this.stepVar}` : known ? namedIndex ? from <= to ? `++${idx}` : `--${idx}` : from <= to ? `${idx}++` : `${idx}--` : namedIndex ? `${cond} ? ++${idx} : --${idx}` : `${cond} ? ${idx}++ : ${idx}--`;
        if (namedIndex) {
          varPart = `${idxName} = ${varPart}`;
        }
        if (namedIndex) {
          stepPart = `${idxName} = ${stepPart}`;
        }
        return [this.makeCode(`${varPart}; ${condPart}; ${stepPart}`)];
      }

      compileArray(o) {
        var args, body, cond, hasArgs, i, idt, j, known, post, pre, range, ref3, ref4, result, results, vars;
        known = (this.fromNum != null) && (this.toNum != null);
        if (known && Math.abs(this.fromNum - this.toNum) <= 20) {
          range = (function() {
            results = [];
            for (var j = ref3 = this.fromNum, ref4 = this.toNum; ref3 <= ref4 ? j <= ref4 : j >= ref4; ref3 <= ref4 ? j++ : j--){ results.push(j); }
            return results;
          }).apply(this);
          if (this.exclusive) {
            range.pop();
          }
          return [this.makeCode(`[${range.join(', ')}]`)];
        }
        idt = this.tab + TAB;
        i = o.scope.freeVariable('i', {
          single: true
        });
        result = o.scope.freeVariable('results');
        pre = `\n${idt}${result} = [];`;
        if (known) {
          o.index = i;
          body = fragmentsToText(this.compileNode(o));
        } else {
          vars = `${i} = ${this.fromC}` + (this.toC !== this.toVar ? `, ${this.toC}` : '');
          cond = `${this.fromVar} <= ${this.toVar}`;
          body = `var ${vars}; ${cond} ? ${i} <${this.equals} ${this.toVar} : ${i} >${this.equals} ${this.toVar}; ${cond} ? ${i}++ : ${i}--`;
        }
        post = `{ ${result}.push(${i}); }\n${idt}return ${result};\n${o.indent}`;
        hasArgs = function(node) {
          return node != null ? node.contains(isLiteralArguments) : void 0;
        };
        if (hasArgs(this.from) || hasArgs(this.to)) {
          args = ', arguments';
        }
        return [this.makeCode(`(function() {${pre}\n${idt}for (${body})${post}}).apply(this${args != null ? args : ''})`)];
      }

    };

    Range.__super__ = superClass.prototype;

    Range.prototype.children = ['from', 'to'];

    return Range;

  })(Base);

  exports.Slice = Slice = (function(superClass) {
    class Slice extends superClass {
      constructor(range1) {
        super();
        this.range = range1;
      }

      compileNode(o) {
        var compiled, compiledText, from, fromCompiled, ref3, to, toStr;
        ref3 = this.range, to = ref3.to, from = ref3.from;
        fromCompiled = from && from.compileToFragments(o, LEVEL_PAREN) || [this.makeCode('0')];
        if (to) {
          compiled = to.compileToFragments(o, LEVEL_PAREN);
          compiledText = fragmentsToText(compiled);
          if (!(!this.range.exclusive && +compiledText === -1)) {
            toStr = ', ' + (this.range.exclusive ? compiledText : to.isNumber() ? `${+compiledText + 1}` : (compiled = to.compileToFragments(o, LEVEL_ACCESS), `+${fragmentsToText(compiled)} + 1 || 9e9`));
          }
        }
        return [this.makeCode(`.slice(${fragmentsToText(fromCompiled)}${toStr || ''})`)];
      }

    };

    Slice.__super__ = superClass.prototype;

    Slice.prototype.children = ['range'];

    return Slice;

  })(Base);

  exports.Obj = Obj = (function(superClass) {
    class Obj extends superClass {
      constructor(props, generated = false) {
        super();
        this.generated = generated;
        this.objects = this.properties = props || [];
      }

      compileNode(o) {
        var answer, i, idt, indent, j, join, k, key, lastNoncom, len1, len2, node, prop, props, ref3, value;
        props = this.properties;
        if (this.generated) {
          for (j = 0, len1 = props.length; j < len1; j++) {
            node = props[j];
            if (node instanceof Value) {
              node.error('cannot have an implicit value in an implicit object');
            }
          }
        }
        idt = o.indent += TAB;
        lastNoncom = this.lastNonComment(this.properties);
        answer = [];
        answer.push(this.makeCode(`{${(props.length === 0 ? '}' : '\n')}`));
        for (i = k = 0, len2 = props.length; k < len2; i = ++k) {
          prop = props[i];
          join = i === props.length - 1 ? '' : prop === lastNoncom || prop instanceof Comment ? '\n' : ',\n';
          indent = prop instanceof Comment ? '' : idt;
          if (prop instanceof Assign) {
            if (prop.context !== 'object') {
              prop.operatorToken.error(`unexpected ${prop.operatorToken.value}`);
            }
            if (prop.variable instanceof Value && prop.variable.hasProperties()) {
              prop.variable.error('invalid object key');
            }
          }
          if (prop instanceof Value && prop["this"]) {
            prop = new Assign(prop.properties[0].name, prop, 'object');
          }
          if (!(prop instanceof Comment) && !(prop instanceof Assign)) {
            if (prop.isComplex()) {
              ref3 = prop.base.cache(o), key = ref3[0], value = ref3[1];
              if (key instanceof IdentifierLiteral) {
                key = new PropertyName(key.value);
              }
              prop = new Assign(key, value, 'object');
            } else {
              prop = new Assign(prop, prop, 'object');
            }
          }
          if (indent) {
            answer.push(this.makeCode(indent));
          }
          answer.push(...prop.compileToFragments(o, LEVEL_TOP));
          if (join) {
            answer.push(this.makeCode(join));
          }
        }
        if (props.length !== 0) {
          answer.push(this.makeCode(`\n${this.tab}}`));
        }
        if (this.front) {
          return this.wrapInBraces(answer);
        } else {
          return answer;
        }
      }

      assigns(name) {
        var j, len1, prop, ref3;
        ref3 = this.properties;
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          prop = ref3[j];
          if (prop.assigns(name)) {
            return true;
          }
        }
        return false;
      }

    };

    Obj.__super__ = superClass.prototype;

    Obj.prototype.children = ['properties'];

    return Obj;

  })(Base);

  exports.Arr = Arr = (function(superClass) {
    class Arr extends superClass {
      constructor(objs) {
        super();
        this.objects = objs || [];
      }

      compileNode(o) {
        var answer, compiledObjs, fragments, index, j, len1, obj;
        if (!this.objects.length) {
          return [this.makeCode('[]')];
        }
        o.indent += TAB;
        answer = [];
        compiledObjs = (function() {
          var j, len1, ref3, results;
          ref3 = this.objects;
          results = [];
          for (j = 0, len1 = ref3.length; j < len1; j++) {
            obj = ref3[j];
            results.push(obj.compileToFragments(o, LEVEL_LIST));
          }
          return results;
        }).call(this);
        for (index = j = 0, len1 = compiledObjs.length; j < len1; index = ++j) {
          fragments = compiledObjs[index];
          if (index) {
            answer.push(this.makeCode(", "));
          }
          answer.push(...fragments);
        }
        if (fragmentsToText(answer).indexOf('\n') >= 0) {
          answer.unshift(this.makeCode(`[\n${o.indent}`));
          answer.push(this.makeCode(`\n${this.tab}]`));
        } else {
          answer.unshift(this.makeCode("["));
          answer.push(this.makeCode("]"));
        }
        return answer;
      }

      assigns(name) {
        var j, len1, obj, ref3;
        ref3 = this.objects;
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          obj = ref3[j];
          if (obj.assigns(name)) {
            return true;
          }
        }
        return false;
      }

    };

    Arr.__super__ = superClass.prototype;

    Arr.prototype.children = ['objects'];

    return Arr;

  })(Base);

  exports.Class = Class = (function(superClass) {
    class Class extends superClass {
      constructor(variable1, parent1, body1 = new Block) {
        super();
        this.variable = variable1;
        this.parent = parent1;
        this.body = body1;
      }

      compileNode(o) {
        var assign, executableBody, result;
        this.name = this.determineName();
        executableBody = this.walkBody();
        if (executableBody) {
          this.compileNode = this.compileClassDeclaration;
          result = new ExecutableClassBody(this, executableBody).compileToFragments(o);
          this.compileNode = this.constructor.prototype.compileNode;
        } else {
          result = this.compileClassDeclaration(o);
          if ((this.name == null) && o.level === LEVEL_TOP) {
            result = this.wrapInBraces(result);
          }
        }
        if (this.variable) {
          assign = new Assign(this.variable, new Literal(''), null, {
            moduleDeclaration: this.moduleDeclaration
          });
          return [...assign.compileToFragments(o), ...result];
        } else {
          return result;
        }
      }

      compileClassDeclaration(o) {
        var ref3, result;
        if (this.externalCtor || this.boundMethods.length) {
          if (this.ctor == null) {
            this.ctor = this.makeDefaultConstructor();
          }
        }
        if ((ref3 = this.ctor) != null) {
          ref3.noReturn = true;
        }
        if (this.boundMethods.length) {
          this.proxyBoundMethods(o);
        }
        o.indent += TAB;
        result = [];
        result.push(this.makeCode("class "));
        if (this.name) {
          result.push(this.makeCode(`${this.name} `));
        }
        if (this.parent) {
          result.push(this.makeCode('extends '), ...this.parent.compileToFragments(o), this.makeCode(' '));
        }
        result.push(this.makeCode('{'));
        if (!this.body.isEmpty()) {
          this.body.spaced = true;
          result.push(this.makeCode('\n'));
          result.push(...this.body.compileToFragments(o, LEVEL_TOP));
          result.push(this.makeCode(`\n${this.tab}`));
        }
        result.push(this.makeCode('}'));
        return result;
      }

      determineName() {
        var message, name, node, ref3, tail;
        if (!this.variable) {
          return null;
        }
        ref3 = this.variable.properties, tail = ref3[ref3.length - 1];
        node = tail ? tail instanceof Access && tail.name : this.variable.base;
        if (!(node instanceof IdentifierLiteral || node instanceof PropertyName)) {
          return null;
        }
        name = node.value;
        if (!tail) {
          message = isUnassignable(name);
          if (message) {
            this.variable.error(message);
          }
        }
        if (indexOf.call(JS_FORBIDDEN, name) >= 0) {
          return `_${name}`;
        } else {
          return name;
        }
      }

      walkBody() {
        var assign, end, executableBody, expression, expressions, exprs, i, initializer, initializerExpression, j, k, len1, len2, method, properties, pushSlice, ref3, start;
        this.ctor = null;
        this.boundMethods = [];
        executableBody = null;
        initializer = [];
        expressions = this.body.expressions;
        i = 0;
        ref3 = expressions.slice();
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          expression = ref3[j];
          if (expression instanceof Value && expression.isObject(true)) {
            properties = expression.base.properties;
            exprs = [];
            end = 0;
            start = 0;
            pushSlice = function() {
              if (end > start) {
                return exprs.push(new Value(new Obj(properties.slice(start, end), true)));
              }
            };
            while (assign = properties[end]) {
              if (initializerExpression = this.addInitializerExpression(assign)) {
                pushSlice();
                exprs.push(initializerExpression);
                initializer.push(initializerExpression);
                start = end + 1;
              } else if (initializer[initializer.length - 1] instanceof Comment) {
                exprs.pop();
                initializer.pop();
                start--;
              }
              end++;
            }
            pushSlice();
            [].splice.apply(expressions, [i, i - i + 1].concat(exprs)), exprs;
            i += exprs.length;
          } else {
            if (initializerExpression = this.addInitializerExpression(expression)) {
              initializer.push(initializerExpression);
              expressions[i] = initializerExpression;
            } else if (initializer[initializer.length - 1] instanceof Comment) {
              initializer.pop();
            }
            i += 1;
          }
        }
        for (k = 0, len2 = initializer.length; k < len2; k++) {
          method = initializer[k];
          if (method instanceof Code) {
            if (method.ctor) {
              if (this.ctor) {
                method.error('Cannot define more than one constructor in a class');
              }
              this.ctor = method;
            } else if (method.bound && method.isStatic) {
              method.context = this.name;
            } else if (method.bound) {
              this.boundMethods.push(method.name);
              method.bound = false;
            }
          }
        }
        if (this.parent || initializer.length !== expressions.length) {
          this.body.expressions = (function() {
            var l, len3, results;
            results = [];
            for (l = 0, len3 = initializer.length; l < len3; l++) {
              expression = initializer[l];
              results.push(expression.hoist());
            }
            return results;
          })();
          return new Block(expressions);
        }
      }

      addInitializerExpression(node) {
        switch (false) {
          case !(node instanceof Comment):
            return node;
          case !this.validInitializerMethod(node):
            return this.addInitializerMethod(node);
          default:
            return null;
        }
      }

      validInitializerMethod(node) {
        if (!(node instanceof Assign && node.value instanceof Code)) {
          return false;
        }
        if (node.context === 'object' && !node.variable.hasProperties()) {
          return true;
        }
        return node.variable.looksStatic(this.name) && (this.name || !node.value.bound);
      }

      addInitializerMethod(assign) {
        var method, methodName, variable;
        variable = assign.variable;
        method = assign.value;
        method.isMethod = true;
        method.isStatic = variable.looksStatic(this.name);
        method.klass = new IdentifierLiteral(this.name);
        method.variable = variable;
        if (method.isStatic) {
          method.name = variable.properties[0];
        } else {
          methodName = variable.base;
          method.name = new (methodName.isComplex() ? Index : Access)(methodName);
          if (methodName.value === 'constructor') {
            method.ctor = (this.parent ? 'derived' : 'base');
          }
          if (method.bound && method.ctor) {
            method.error('Cannot define a constructor as a bound function');
          }
        }
        return method;
      }

      makeDefaultConstructor() {
        var applyArgs, applyCtor, ctor;
        ctor = this.addInitializerMethod(new Assign(new Value(new PropertyName('constructor')), new Code));
        this.body.unshift(ctor);
        if (this.parent) {
          ctor.body.push(new SuperCall);
        }
        if (this.externalCtor) {
          applyCtor = new Value(this.externalCtor, [new Access(new PropertyName('apply'))]);
          applyArgs = [new ThisLiteral, new IdentifierLiteral('arguments')];
          ctor.body.push(new Call(applyCtor, applyArgs));
          ctor.body.makeReturn();
        }
        return ctor;
      }

      proxyBoundMethods(o) {
        var name;
        this.ctor.thisAssignments = (function() {
          var j, ref3, results;
          ref3 = this.boundMethods;
          results = [];
          for (j = ref3.length - 1; j >= 0; j += -1) {
            name = ref3[j];
            name = new Value(new ThisLiteral, [name]).compile(o);
            results.push(new Literal(`${name} = ${utility('bind', o)}(${name}, this)`));
          }
          return results;
        }).call(this);
        return null;
      }

    };

    Class.__super__ = superClass.prototype;

    Class.prototype.children = ['variable', 'parent', 'body'];

    return Class;

  })(Base);

  exports.ExecutableClassBody = ExecutableClassBody = (function(superClass) {
    class ExecutableClassBody extends superClass {
      constructor(_class, body1 = new Block) {
        super();
        this["class"] = _class;
        this.body = body1;
      }

      compileNode(o) {
        var args, argumentsNode, directives, externalCtor, ident, jumpNode, klass, params, parent, ref3, wrapper;
        if (jumpNode = this.body.jumps()) {
          jumpNode.error('Class bodies cannot contain pure statements');
        }
        if (argumentsNode = this.body.contains(isLiteralArguments)) {
          argumentsNode.error("Class bodies shouldn't reference arguments");
        }
        this.name = (ref3 = this["class"].name) != null ? ref3 : this.defaultClassVariableName;
        directives = this.walkBody();
        this.setContext();
        ident = new IdentifierLiteral(this.name);
        params = [];
        args = [];
        wrapper = new Code(params, this.body);
        klass = new Parens(new Call(wrapper, args));
        this.body.spaced = true;
        o.classScope = wrapper.makeScope(o.scope);
        if (this.externalCtor) {
          externalCtor = new IdentifierLiteral(o.classScope.freeVariable('ctor', {
            reserve: false
          }));
          this["class"].externalCtor = externalCtor;
          this.externalCtor.variable.base = externalCtor;
        }
        if (this["class"].parent) {
          parent = new IdentifierLiteral(o.classScope.freeVariable('superClass', {
            reserve: false
          }));
          params.push(new Param(parent));
          args.push(this["class"].parent);
          this["class"].parent = parent;
          this.body.unshift(new Literal(`${this.name}.__super__ = ${parent.value}.prototype`));
        }
        if (this.name !== this["class"].name) {
          this.body.expressions.unshift(new Assign(new IdentifierLiteral(this.name), this["class"]));
        } else {
          this.body.expressions.unshift(this["class"]);
        }
        this.body.expressions.unshift(...directives);
        this.body.push(ident);
        return klass.compileToFragments(o);
      }

      walkBody() {
        var directives, expr, index;
        directives = [];
        index = 0;
        while (expr = this.body.expressions[index]) {
          if (!(expr instanceof Comment || expr instanceof Value && expr.isString())) {
            break;
          }
          if (expr.hoisted) {
            index++;
          } else {
            directives.push(...this.body.expressions.splice(index, 1));
          }
        }
        this.traverseChildren(false, (child) => {
          var cont, i, j, len1, node, ref3;
          if (child instanceof Class || child instanceof HoistTarget) {
            return false;
          }
          cont = true;
          if (child instanceof Block) {
            ref3 = child.expressions;
            for (i = j = 0, len1 = ref3.length; j < len1; i = ++j) {
              node = ref3[i];
              if (node instanceof Value && node.isObject(true)) {
                cont = false;
                child.expressions[i] = this.addProperties(node.base.properties);
              } else if (node instanceof Assign && node.variable.looksStatic(this.name)) {
                node.value.isStatic = true;
              } else if (node instanceof Code && node.isMethod) {
                node.klass = new IdentifierLiteral(this.name);
              }
            }
            child.expressions = flatten(child.expressions);
          }
          return cont;
        });
        return directives;
      }

      setContext() {
        return this.body.traverseChildren(false, (node) => {
          if (node instanceof ThisLiteral) {
            return node.value = this.name;
          } else if (node instanceof Code && node.bound) {
            return node.context = this.name;
          }
        });
      }

      addProperties(assigns) {
        var assign, base, name, prototype, result, value, variable;
        result = (function() {
          var j, len1, results;
          results = [];
          for (j = 0, len1 = assigns.length; j < len1; j++) {
            assign = assigns[j];
            variable = assign.variable;
            base = variable != null ? variable.base : void 0;
            value = assign.value;
            delete assign.context;
            if (assign instanceof Comment) {

            } else if (base.value === 'constructor') {
              if (value instanceof Code) {
                base.error('constructors must be defined at the top level of a class body');
              }
              assign = this.externalCtor = new Assign(new Value, value);
            } else if (!assign.variable["this"]) {
              name = new (base.isComplex() ? Index : Access)(base);
              prototype = new Access(new PropertyName('prototype'));
              variable = new Value(new ThisLiteral(), [prototype, name]);
              assign.variable = variable;
            } else if (assign.value instanceof Code) {
              assign.value.isStatic = true;
            }
            results.push(assign);
          }
          return results;
        }).call(this);
        return compact(result);
      }

    };

    ExecutableClassBody.__super__ = superClass.prototype;

    ExecutableClassBody.prototype.children = ['class', 'body'];

    ExecutableClassBody.prototype.defaultClassVariableName = '_Class';

    return ExecutableClassBody;

  })(Base);

  exports.ModuleDeclaration = ModuleDeclaration = (function(superClass) {
    class ModuleDeclaration extends superClass {
      constructor(clause, source1) {
        super();
        this.clause = clause;
        this.source = source1;
        this.checkSource();
      }

      checkSource() {
        if ((this.source != null) && this.source instanceof StringWithInterpolations) {
          return this.source.error('the name of the module to be imported from must be an uninterpolated string');
        }
      }

      checkScope(o, moduleDeclarationType) {
        if (o.indent.length !== 0) {
          return this.error(`${moduleDeclarationType} statements must be at top-level scope`);
        }
      }

    };

    ModuleDeclaration.__super__ = superClass.prototype;

    ModuleDeclaration.prototype.children = ['clause', 'source'];

    ModuleDeclaration.prototype.isStatement = YES;

    ModuleDeclaration.prototype.jumps = THIS;

    ModuleDeclaration.prototype.makeReturn = THIS;

    return ModuleDeclaration;

  })(Base);

  exports.ImportDeclaration = ImportDeclaration = (function(superClass) {
    class ImportDeclaration extends superClass {
      compileNode(o) {
        var code, ref3;
        this.checkScope(o, 'import');
        o.importedSymbols = [];
        code = [];
        code.push(this.makeCode(`${this.tab}import `));
        if (this.clause != null) {
          code.push(...this.clause.compileNode(o));
        }
        if (((ref3 = this.source) != null ? ref3.value : void 0) != null) {
          if (this.clause !== null) {
            code.push(this.makeCode(' from '));
          }
          code.push(this.makeCode(this.source.value));
        }
        code.push(this.makeCode(';'));
        return code;
      }

    };

    ImportDeclaration.__super__ = superClass.prototype;

    return ImportDeclaration;

  })(ModuleDeclaration);

  exports.ImportClause = ImportClause = (function(superClass) {
    class ImportClause extends superClass {
      constructor(defaultBinding, namedImports) {
        super();
        this.defaultBinding = defaultBinding;
        this.namedImports = namedImports;
      }

      compileNode(o) {
        var code;
        code = [];
        if (this.defaultBinding != null) {
          code.push(...this.defaultBinding.compileNode(o));
          if (this.namedImports != null) {
            code.push(this.makeCode(', '));
          }
        }
        if (this.namedImports != null) {
          code.push(...this.namedImports.compileNode(o));
        }
        return code;
      }

    };

    ImportClause.__super__ = superClass.prototype;

    ImportClause.prototype.children = ['defaultBinding', 'namedImports'];

    return ImportClause;

  })(Base);

  exports.ExportDeclaration = ExportDeclaration = (function(superClass) {
    class ExportDeclaration extends superClass {
      compileNode(o) {
        var code, ref3;
        this.checkScope(o, 'export');
        code = [];
        code.push(this.makeCode(`${this.tab}export `));
        if (this instanceof ExportDefaultDeclaration) {
          code.push(this.makeCode('default '));
        }
        if (!(this instanceof ExportDefaultDeclaration) && (this.clause instanceof Assign || this.clause instanceof Class)) {
          if (this.clause instanceof Class && !this.clause.variable) {
            this.clause.error('anonymous classes cannot be exported');
          }
          code.push(this.makeCode('var '));
          this.clause.moduleDeclaration = 'export';
        }
        if ((this.clause.body != null) && this.clause.body instanceof Block) {
          code = code.concat(this.clause.compileToFragments(o, LEVEL_TOP));
        } else {
          code = code.concat(this.clause.compileNode(o));
        }
        if (((ref3 = this.source) != null ? ref3.value : void 0) != null) {
          code.push(this.makeCode(` from ${this.source.value}`));
        }
        code.push(this.makeCode(';'));
        return code;
      }

    };

    ExportDeclaration.__super__ = superClass.prototype;

    return ExportDeclaration;

  })(ModuleDeclaration);

  exports.ExportNamedDeclaration = ExportNamedDeclaration = (function(superClass) {
    class ExportNamedDeclaration extends superClass {};

    ExportNamedDeclaration.__super__ = superClass.prototype;

    return ExportNamedDeclaration;

  })(ExportDeclaration);

  exports.ExportDefaultDeclaration = ExportDefaultDeclaration = (function(superClass) {
    class ExportDefaultDeclaration extends superClass {};

    ExportDefaultDeclaration.__super__ = superClass.prototype;

    return ExportDefaultDeclaration;

  })(ExportDeclaration);

  exports.ExportAllDeclaration = ExportAllDeclaration = (function(superClass) {
    class ExportAllDeclaration extends superClass {};

    ExportAllDeclaration.__super__ = superClass.prototype;

    return ExportAllDeclaration;

  })(ExportDeclaration);

  exports.ModuleSpecifierList = ModuleSpecifierList = (function(superClass) {
    class ModuleSpecifierList extends superClass {
      constructor(specifiers) {
        super();
        this.specifiers = specifiers;
      }

      compileNode(o) {
        var code, compiledList, fragments, index, j, len1, specifier;
        code = [];
        o.indent += TAB;
        compiledList = (function() {
          var j, len1, ref3, results;
          ref3 = this.specifiers;
          results = [];
          for (j = 0, len1 = ref3.length; j < len1; j++) {
            specifier = ref3[j];
            results.push(specifier.compileToFragments(o, LEVEL_LIST));
          }
          return results;
        }).call(this);
        if (this.specifiers.length !== 0) {
          code.push(this.makeCode(`{\n${o.indent}`));
          for (index = j = 0, len1 = compiledList.length; j < len1; index = ++j) {
            fragments = compiledList[index];
            if (index) {
              code.push(this.makeCode(`,\n${o.indent}`));
            }
            code.push(...fragments);
          }
          code.push(this.makeCode("\n}"));
        } else {
          code.push(this.makeCode('{}'));
        }
        return code;
      }

    };

    ModuleSpecifierList.__super__ = superClass.prototype;

    ModuleSpecifierList.prototype.children = ['specifiers'];

    return ModuleSpecifierList;

  })(Base);

  exports.ImportSpecifierList = ImportSpecifierList = (function(superClass) {
    class ImportSpecifierList extends superClass {};

    ImportSpecifierList.__super__ = superClass.prototype;

    return ImportSpecifierList;

  })(ModuleSpecifierList);

  exports.ExportSpecifierList = ExportSpecifierList = (function(superClass) {
    class ExportSpecifierList extends superClass {};

    ExportSpecifierList.__super__ = superClass.prototype;

    return ExportSpecifierList;

  })(ModuleSpecifierList);

  exports.ModuleSpecifier = ModuleSpecifier = (function(superClass) {
    class ModuleSpecifier extends superClass {
      constructor(original, alias, moduleDeclarationType1) {
        super();
        this.original = original;
        this.alias = alias;
        this.moduleDeclarationType = moduleDeclarationType1;
        this.identifier = this.alias != null ? this.alias.value : this.original.value;
      }

      compileNode(o) {
        var code;
        o.scope.add(this.identifier, this.moduleDeclarationType);
        code = [];
        code.push(this.makeCode(this.original.value));
        if (this.alias != null) {
          code.push(this.makeCode(` as ${this.alias.value}`));
        }
        return code;
      }

    };

    ModuleSpecifier.__super__ = superClass.prototype;

    ModuleSpecifier.prototype.children = ['original', 'alias'];

    return ModuleSpecifier;

  })(Base);

  exports.ImportSpecifier = ImportSpecifier = (function(superClass) {
    class ImportSpecifier extends superClass {
      constructor(imported, local) {
        super(imported, local, 'import');
      }

      compileNode(o) {
        var ref3;
        if ((ref3 = this.identifier, indexOf.call(o.importedSymbols, ref3) >= 0) || o.scope.check(this.identifier)) {
          this.error(`'${this.identifier}' has already been declared`);
        } else {
          o.importedSymbols.push(this.identifier);
        }
        return ImportSpecifier.__super__.compileNode.call(this, o);
      }

    };

    ImportSpecifier.__super__ = superClass.prototype;

    return ImportSpecifier;

  })(ModuleSpecifier);

  exports.ImportDefaultSpecifier = ImportDefaultSpecifier = (function(superClass) {
    class ImportDefaultSpecifier extends superClass {};

    ImportDefaultSpecifier.__super__ = superClass.prototype;

    return ImportDefaultSpecifier;

  })(ImportSpecifier);

  exports.ImportNamespaceSpecifier = ImportNamespaceSpecifier = (function(superClass) {
    class ImportNamespaceSpecifier extends superClass {};

    ImportNamespaceSpecifier.__super__ = superClass.prototype;

    return ImportNamespaceSpecifier;

  })(ImportSpecifier);

  exports.ExportSpecifier = ExportSpecifier = (function(superClass) {
    class ExportSpecifier extends superClass {
      constructor(local, exported) {
        super(local, exported, 'export');
      }

    };

    ExportSpecifier.__super__ = superClass.prototype;

    return ExportSpecifier;

  })(ModuleSpecifier);

  exports.Assign = Assign = (function(superClass) {
    class Assign extends superClass {
      constructor(variable1, value1, context1, options = {}) {
        super();
        this.variable = variable1;
        this.value = value1;
        this.context = context1;
        this.param = options.param, this.subpattern = options.subpattern, this.operatorToken = options.operatorToken, this.moduleDeclaration = options.moduleDeclaration;
      }

      isStatement(o) {
        return (o != null ? o.level : void 0) === LEVEL_TOP && (this.context != null) && (this.moduleDeclaration || indexOf.call(this.context, "?") >= 0);
      }

      checkAssignability(o, varBase) {
        if (Object.prototype.hasOwnProperty.call(o.scope.positions, varBase.value) && o.scope.variables[o.scope.positions[varBase.value]].type === 'import') {
          return varBase.error(`'${varBase.value}' is read-only`);
        }
      }

      assigns(name) {
        return this[this.context === 'object' ? 'value' : 'variable'].assigns(name);
      }

      unfoldSoak(o) {
        return unfoldSoak(o, this, 'variable');
      }

      compileNode(o) {
        var answer, compiledName, isValue, j, name, properties, prototype, ref3, ref4, ref5, ref6, ref7, ref8, val, varBase;
        if (isValue = this.variable instanceof Value) {
          if (this.variable.isArray() || this.variable.isObject()) {
            return this.compilePatternMatch(o);
          }
          if (this.variable.isSplice()) {
            return this.compileSplice(o);
          }
          if ((ref3 = this.context) === '||=' || ref3 === '&&=' || ref3 === '?=') {
            return this.compileConditional(o);
          }
          if ((ref4 = this.context) === '**=' || ref4 === '//=' || ref4 === '%%=') {
            return this.compileSpecialMath(o);
          }
        }
        if (this.value instanceof Code) {
          if (this.value.isStatic) {
            this.value.klass = this.variable.base;
            this.value.name = this.variable.properties[0];
            this.value.variable = this.variable;
          } else if (((ref5 = this.variable.properties) != null ? ref5.length : void 0) >= 2) {
            ref6 = this.variable.properties, properties = 3 <= ref6.length ? slice.call(ref6, 0, j = ref6.length - 2) : (j = 0, []), prototype = ref6[j++], name = ref6[j++];
            if (((ref7 = prototype.name) != null ? ref7.value : void 0) === 'prototype') {
              this.value.klass = new Value(this.variable.base, properties);
              this.value.name = name;
              this.value.variable = this.variable;
            }
          }
        }
        if (!this.context) {
          varBase = this.variable.unwrapAll();
          if (!varBase.isAssignable()) {
            this.variable.error(`'${this.variable.compile(o)}' can't be assigned`);
          }
          if (!(typeof varBase.hasProperties === "function" ? varBase.hasProperties() : void 0)) {
            if (this.moduleDeclaration) {
              this.checkAssignability(o, varBase);
              o.scope.add(varBase.value, this.moduleDeclaration);
            } else if (this.param) {
              o.scope.add(varBase.value, 'var');
            } else {
              this.checkAssignability(o, varBase);
              o.scope.find(varBase.value);
            }
          }
        }
        val = this.value.compileToFragments(o, LEVEL_LIST);
        if (isValue && this.variable.base instanceof Obj) {
          this.variable.front = true;
        }
        compiledName = this.variable.compileToFragments(o, LEVEL_LIST);
        if (this.context === 'object') {
          if (this.variable.isComplex()) {
            compiledName.unshift(this.makeCode('['));
            compiledName.push(this.makeCode(']'));
          } else if (ref8 = fragmentsToText(compiledName), indexOf.call(JS_FORBIDDEN, ref8) >= 0) {
            compiledName.unshift(this.makeCode('"'));
            compiledName.push(this.makeCode('"'));
          }
          return compiledName.concat(this.makeCode(": "), val);
        }
        answer = compiledName.concat(this.makeCode(` ${this.context || '='} `), val);
        if (o.level <= LEVEL_LIST) {
          return answer;
        } else {
          return this.wrapInBraces(answer);
        }
      }

      compilePatternMatch(o) {
        var acc, assigns, code, defaultValue, expandedIdx, fragments, i, idx, isObject, ivar, j, len1, message, name, obj, objects, olen, ref, ref3, ref4, ref5, ref6, rest, top, val, value, vvar, vvarText;
        top = o.level === LEVEL_TOP;
        value = this.value;
        objects = this.variable.base.objects;
        if (!(olen = objects.length)) {
          code = value.compileToFragments(o);
          if (o.level >= LEVEL_OP) {
            return this.wrapInBraces(code);
          } else {
            return code;
          }
        }
        obj = objects[0];
        if (olen === 1 && obj instanceof Expansion) {
          obj.error('Destructuring assignment has no target');
        }
        isObject = this.variable.isObject();
        if (top && olen === 1 && !(obj instanceof Splat)) {
          defaultValue = null;
          if (obj instanceof Assign && obj.context === 'object') {
            ref3 = obj, (ref4 = ref3.variable, idx = ref4.base), obj = ref3.value;
            if (obj instanceof Assign) {
              defaultValue = obj.value;
              obj = obj.variable;
            }
          } else {
            if (obj instanceof Assign) {
              defaultValue = obj.value;
              obj = obj.variable;
            }
            idx = isObject ? obj["this"] ? obj.properties[0].name : new PropertyName(obj.unwrap().value) : new NumberLiteral(0);
          }
          acc = idx.unwrap() instanceof PropertyName;
          value = new Value(value);
          value.properties.push(new (acc ? Access : Index)(idx));
          message = isUnassignable(obj.unwrap().value);
          if (message) {
            obj.error(message);
          }
          if (defaultValue) {
            value = new Op('?', value, defaultValue);
          }
          return new Assign(obj, value, null, {
            param: this.param
          }).compileToFragments(o, LEVEL_TOP);
        }
        vvar = value.compileToFragments(o, LEVEL_LIST);
        vvarText = fragmentsToText(vvar);
        assigns = [];
        expandedIdx = false;
        if (!(value.unwrap() instanceof IdentifierLiteral) || this.variable.assigns(vvarText)) {
          assigns.push([this.makeCode(`${(ref = o.scope.freeVariable('ref'))} = `), ...vvar]);
          vvar = [this.makeCode(ref)];
          vvarText = ref;
        }
        for (i = j = 0, len1 = objects.length; j < len1; i = ++j) {
          obj = objects[i];
          idx = i;
          if (!expandedIdx && obj instanceof Splat) {
            name = obj.name.unwrap().value;
            obj = obj.unwrap();
            val = `${olen} <= ${vvarText}.length ? ${utility('slice', o)}.call(${vvarText}, ${i}`;
            if (rest = olen - i - 1) {
              ivar = o.scope.freeVariable('i', {
                single: true
              });
              val += `, ${ivar} = ${vvarText}.length - ${rest}) : (${ivar} = ${i}, [])`;
            } else {
              val += ") : []";
            }
            val = new Literal(val);
            expandedIdx = `${ivar}++`;
          } else if (!expandedIdx && obj instanceof Expansion) {
            if (rest = olen - i - 1) {
              if (rest === 1) {
                expandedIdx = `${vvarText}.length - 1`;
              } else {
                ivar = o.scope.freeVariable('i', {
                  single: true
                });
                val = new Literal(`${ivar} = ${vvarText}.length - ${rest}`);
                expandedIdx = `${ivar}++`;
                assigns.push(val.compileToFragments(o, LEVEL_LIST));
              }
            }
            continue;
          } else {
            if (obj instanceof Splat || obj instanceof Expansion) {
              obj.error("multiple splats/expansions are disallowed in an assignment");
            }
            defaultValue = null;
            if (obj instanceof Assign && obj.context === 'object') {
              ref5 = obj, (ref6 = ref5.variable, idx = ref6.base), obj = ref5.value;
              if (obj instanceof Assign) {
                defaultValue = obj.value;
                obj = obj.variable;
              }
            } else {
              if (obj instanceof Assign) {
                defaultValue = obj.value;
                obj = obj.variable;
              }
              idx = isObject ? obj["this"] ? obj.properties[0].name : new PropertyName(obj.unwrap().value) : new Literal(expandedIdx || idx);
            }
            name = obj.unwrap().value;
            acc = idx.unwrap() instanceof PropertyName;
            val = new Value(new Literal(vvarText), [new (acc ? Access : Index)(idx)]);
            if (defaultValue) {
              val = new Op('?', val, defaultValue);
            }
          }
          if (name != null) {
            message = isUnassignable(name);
            if (message) {
              obj.error(message);
            }
          }
          assigns.push(new Assign(obj, val, null, {
            param: this.param,
            subpattern: true
          }).compileToFragments(o, LEVEL_LIST));
        }
        if (!(top || this.subpattern)) {
          assigns.push(vvar);
        }
        fragments = this.joinFragmentArrays(assigns, ', ');
        if (o.level < LEVEL_LIST) {
          return fragments;
        } else {
          return this.wrapInBraces(fragments);
        }
      }

      compileConditional(o) {
        var fragments, left, ref3, right;
        ref3 = this.variable.cacheReference(o), left = ref3[0], right = ref3[1];
        if (!left.properties.length && left.base instanceof Literal && !(left.base instanceof ThisLiteral) && !o.scope.check(left.base.value)) {
          this.variable.error(`the variable \"${left.base.value}\" can't be assigned with ${this.context} because it has not been declared before`);
        }
        if (indexOf.call(this.context, "?") >= 0) {
          o.isExistentialEquals = true;
          return new If(new Existence(left), right, {
            type: 'if'
          }).addElse(new Assign(right, this.value, '=')).compileToFragments(o);
        } else {
          fragments = new Op(this.context.slice(0, -1), left, new Assign(right, this.value, '=')).compileToFragments(o);
          if (o.level <= LEVEL_LIST) {
            return fragments;
          } else {
            return this.wrapInBraces(fragments);
          }
        }
      }

      compileSpecialMath(o) {
        var left, ref3, right;
        ref3 = this.variable.cacheReference(o), left = ref3[0], right = ref3[1];
        return new Assign(left, new Op(this.context.slice(0, -1), right, this.value)).compileToFragments(o);
      }

      compileSplice(o) {
        var answer, exclusive, from, fromDecl, fromRef, name, ref3, ref4, ref5, to, valDef, valRef;
        ref3 = this.variable.properties.pop().range, from = ref3.from, to = ref3.to, exclusive = ref3.exclusive;
        name = this.variable.compile(o);
        if (from) {
          ref4 = this.cacheToCodeFragments(from.cache(o, LEVEL_OP)), fromDecl = ref4[0], fromRef = ref4[1];
        } else {
          fromDecl = fromRef = '0';
        }
        if (to) {
          if ((from != null ? from.isNumber() : void 0) && to.isNumber()) {
            to = to.compile(o) - fromRef;
            if (!exclusive) {
              to += 1;
            }
          } else {
            to = to.compile(o, LEVEL_ACCESS) + ' - ' + fromRef;
            if (!exclusive) {
              to += ' + 1';
            }
          }
        } else {
          to = "9e9";
        }
        ref5 = this.value.cache(o, LEVEL_LIST), valDef = ref5[0], valRef = ref5[1];
        answer = [].concat(this.makeCode(`[].splice.apply(${name}, [${fromDecl}, ${to}].concat(`), valDef, this.makeCode(")), "), valRef);
        if (o.level > LEVEL_TOP) {
          return this.wrapInBraces(answer);
        } else {
          return answer;
        }
      }

    };

    Assign.__super__ = superClass.prototype;

    Assign.prototype.children = ['variable', 'value'];

    return Assign;

  })(Base);

  exports.Code = Code = (function(superClass) {
    class Code extends superClass {
      constructor(params, body, tag) {
        super();
        this.params = params || [];
        this.body = body || new Block;
        this.bound = tag === 'boundfunc';
        this.isGenerator = false;
        this.isAsync = false;
        this.isMethod = false;
        this.body.traverseChildren(false, (node) => {
          if ((node instanceof Op && node.isYield()) || node instanceof YieldReturn) {
            this.isGenerator = true;
          }
          if ((node instanceof Op && node.isAwait()) || node instanceof AwaitReturn) {
            this.isAsync = true;
          }
          if (this.isGenerator && this.isAsync) {
            return node.error("function can't contain both yield and await");
          }
        });
      }

      isStatement() {
        return this.isMethod;
      }

      makeScope(parentScope) {
        return new Scope(parentScope, this.body, this);
      }

      compileNode(o) {
        var answer, body, condition, exprs, haveSplatParam, i, ifTrue, j, k, len1, len2, m, modifiers, name, param, paramNames, params, paramsAfterSplat, ref, ref3, ref4, ref5, ref6, ref7, signature, splatParamName, thisAssignments, val, wasEmpty;
        if (this.ctor) {
          if (this.isAsync) {
            this.variable.error('Class constructor may not be async');
          }
          if (this.isGenerator) {
            this.variable.error('Class constructor may not be a generator');
          }
        }
        if (this.bound) {
          if ((ref3 = o.scope.method) != null ? ref3.bound : void 0) {
            this.context = o.scope.method.context;
          }
          if (!this.context) {
            this.context = 'this';
          }
        }
        o.scope = del(o, 'classScope') || this.makeScope(o.scope);
        o.scope.shared = del(o, 'sharedScope');
        o.indent += TAB;
        delete o.bare;
        delete o.isExistentialEquals;
        params = [];
        exprs = [];
        thisAssignments = (ref4 = (ref5 = this.thisAssignments) != null ? ref5.slice() : void 0) != null ? ref4 : [];
        paramsAfterSplat = [];
        haveSplatParam = false;
        paramNames = [];
        this.eachParamName(function(name, node, param) {
          var target;
          if (indexOf.call(paramNames, name) >= 0) {
            node.error(`multiple parameters named '${name}'`);
          }
          paramNames.push(name);
          if (node["this"]) {
            name = node.properties[0].name.value;
            if (indexOf.call(JS_FORBIDDEN, name) >= 0) {
              name = `_${name}`;
            }
            target = new IdentifierLiteral(o.scope.freeVariable(name));
            param.renameParam(node, target);
            return thisAssignments.push(new Assign(node, target));
          }
        });
        ref6 = this.params;
        for (i = j = 0, len1 = ref6.length; j < len1; i = ++j) {
          param = ref6[i];
          if (param.splat || param instanceof Expansion) {
            if (haveSplatParam) {
              param.error('only one splat or expansion parameter is allowed per function definition');
            } else if (param instanceof Expansion && this.params.length === 1) {
              param.error('an expansion parameter cannot be the only parameter in a function definition');
            }
            haveSplatParam = true;
            if (param.splat) {
              params.push(ref = param.asReference(o));
              splatParamName = fragmentsToText(ref.compileNode(o));
              if (param.isComplex()) {
                exprs.push(new Assign(new Value(param.name), ref, '=', {
                  param: true
                }));
              }
            } else {
              splatParamName = o.scope.freeVariable('args');
              params.push(new Value(new IdentifierLiteral(splatParamName)));
            }
            o.scope.parameter(splatParamName);
          } else {
            if (param.isComplex()) {
              val = ref = param.asReference(o);
              if (param.value) {
                val = new Op('?', ref, param.value);
              }
              exprs.push(new Assign(new Value(param.name), val, '=', {
                param: true
              }));
            }
            if (!haveSplatParam) {
              if (!param.isComplex()) {
                ref = param.value != null ? new Assign(new Value(param.name), param.value, '=') : param;
              }
              o.scope.parameter(fragmentsToText((param.value != null ? param : ref).compileToFragments(o)));
              params.push(ref);
            } else {
              paramsAfterSplat.push(param);
              if ((param.value != null) && !param.isComplex()) {
                condition = new Literal(param.name.value + ' === undefined');
                ifTrue = new Assign(new Value(param.name), param.value, '=');
                exprs.push(new If(condition, ifTrue));
              }
              if (((ref7 = param.name) != null ? ref7.value : void 0) != null) {
                o.scope.add(param.name.value, 'var', true);
              }
            }
          }
        }
        if (paramsAfterSplat.length !== 0) {
          exprs.unshift(new Assign(new Value(new Arr([
            new Splat(new IdentifierLiteral(splatParamName)), ...(function() {
              var k, len2, results;
              results = [];
              for (k = 0, len2 = paramsAfterSplat.length; k < len2; k++) {
                param = paramsAfterSplat[k];
                results.push(param.asReference(o));
              }
              return results;
            })()
          ])), new Value(new IdentifierLiteral(splatParamName))));
        }
        wasEmpty = this.body.isEmpty();
        if (!this.expandCtorSuper(thisAssignments)) {
          this.body.expressions.unshift(...thisAssignments);
        }
        this.body.expressions.unshift(...exprs);
        if (!(wasEmpty || this.noReturn)) {
          this.body.makeReturn();
        }
        modifiers = [];
        if (this.isMethod && this.isStatic) {
          modifiers.push('static');
        }
        if (this.isAsync) {
          modifiers.push('async');
        }
        if (!this.isMethod && !this.bound) {
          modifiers.push('function');
        }
        if (this.isGenerator) {
          modifiers.push('*');
        }
        signature = [this.makeCode('(')];
        for (i = k = 0, len2 = params.length; k < len2; i = ++k) {
          param = params[i];
          if (i) {
            signature.push(this.makeCode(', '));
          }
          if (haveSplatParam && i === params.length - 1) {
            signature.push(this.makeCode('...'));
          }
          signature.push(...param.compileToFragments(o));
        }
        signature.push(this.makeCode(')'));
        if (!this.body.isEmpty()) {
          body = this.body.compileWithDeclarations(o);
        }
        if (this.isMethod) {
          name = this.name.compileToFragments(o);
          if (name[0].code === '.') {
            name.shift();
          }
        }
        answer = this.joinFragmentArrays((function() {
          var l, len3, results;
          results = [];
          for (l = 0, len3 = modifiers.length; l < len3; l++) {
            m = modifiers[l];
            results.push(this.makeCode(m));
          }
          return results;
        }).call(this), ' ');
        if (modifiers.length && name) {
          answer.push(this.makeCode(' '));
        }
        if (name) {
          answer.push(...name);
        }
        answer.push(...signature);
        if (this.bound && !this.isMethod) {
          answer.push(this.makeCode(' =>'));
        }
        answer.push(this.makeCode(' {'));
        if (body != null ? body.length : void 0) {
          answer.push(this.makeCode('\n'), ...body, this.makeCode(`\n${this.tab}`));
        }
        answer.push(this.makeCode('}'));
        if (this.isMethod) {
          return [this.makeCode(this.tab), ...answer];
        }
        if (this.front || (o.level >= LEVEL_ACCESS)) {
          return this.wrapInBraces(answer);
        } else {
          return answer;
        }
      }

      eachParamName(iterator) {
        var j, len1, param, ref3, results;
        ref3 = this.params;
        results = [];
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          param = ref3[j];
          results.push(param.eachName(iterator));
        }
        return results;
      }

      traverseChildren(crossScope, func) {
        if (crossScope) {
          return Code.__super__.traverseChildren.call(this, crossScope, func);
        }
      }

      replaceInContext(child, replacement) {
        if (this.bound) {
          return Code.__super__.replaceInContext.call(this, child, replacement);
        } else {
          return false;
        }
      }

      expandCtorSuper(thisAssignments) {
        var haveThisParam, param, ref3, seenSuper;
        if (!this.ctor) {
          return false;
        }
        this.eachSuperCall(Block.wrap(this.params), function(superCall) {
          return superCall.error("'super' is not allowed in constructor parameter defaults");
        });
        seenSuper = this.eachSuperCall(this.body, (superCall) => {
          if (this.ctor === 'base') {
            superCall.error("'super' is only allowed in derived class constructors");
          }
          return superCall.expressions = thisAssignments;
        });
        haveThisParam = thisAssignments.length && thisAssignments.length !== ((ref3 = this.thisAssignments) != null ? ref3.length : void 0);
        if (this.ctor === 'derived' && !seenSuper && haveThisParam) {
          param = thisAssignments[0].variable;
          param.error("Can't use @params in derived class constructors without calling super");
        }
        return seenSuper;
      }

      eachSuperCall(context, iterator) {
        var seenSuper;
        seenSuper = false;
        context.traverseChildren(true, (child) => {
          if (child instanceof SuperCall) {
            seenSuper = true;
            iterator(child);
          } else if (child instanceof ThisLiteral && this.ctor === 'derived' && !seenSuper) {
            child.error("Can't reference 'this' before calling super in derived class constructors");
          }
          return !(child instanceof SuperCall) && (!(child instanceof Code) || child.bound);
        });
        return seenSuper;
      }

    };

    Code.__super__ = superClass.prototype;

    Code.prototype.children = ['params', 'body'];

    Code.prototype.jumps = NO;

    return Code;

  })(Base);

  exports.Param = Param = (function(superClass) {
    class Param extends superClass {
      constructor(name1, value1, splat) {
        var message, token;
        super();
        this.name = name1;
        this.value = value1;
        this.splat = splat;
        message = isUnassignable(this.name.unwrapAll().value);
        if (message) {
          this.name.error(message);
        }
        if (this.name instanceof Obj && this.name.generated) {
          token = this.name.objects[0].operatorToken;
          token.error(`unexpected ${token.value}`);
        }
      }

      compileToFragments(o) {
        return this.name.compileToFragments(o, LEVEL_LIST);
      }

      asReference(o) {
        var name, node;
        if (this.reference) {
          return this.reference;
        }
        node = this.name;
        if (node["this"]) {
          name = node.properties[0].name.value;
          if (indexOf.call(JS_FORBIDDEN, name) >= 0) {
            name = `_${name}`;
          }
          node = new IdentifierLiteral(o.scope.freeVariable(name));
        } else if (node.isComplex()) {
          node = new IdentifierLiteral(o.scope.freeVariable('arg'));
        }
        node = new Value(node);
        node.updateLocationDataIfMissing(this.locationData);
        return this.reference = node;
      }

      isComplex() {
        return this.name.isComplex();
      }

      eachName(iterator, name = this.name) {
        var atParam, j, len1, node, obj, ref3, ref4;
        atParam = (obj) => {
          return iterator(`@${obj.properties[0].name.value}`, obj, this);
        };
        if (name instanceof Literal) {
          return iterator(name.value, name, this);
        }
        if (name instanceof Value) {
          return atParam(name);
        }
        ref4 = (ref3 = name.objects) != null ? ref3 : [];
        for (j = 0, len1 = ref4.length; j < len1; j++) {
          obj = ref4[j];
          if (obj instanceof Assign && (obj.context == null)) {
            obj = obj.variable;
          }
          if (obj instanceof Assign) {
            if (obj.value instanceof Assign) {
              obj = obj.value;
            }
            this.eachName(iterator, obj.value.unwrap());
          } else if (obj instanceof Splat) {
            node = obj.name.unwrap();
            iterator(node.value, node, this);
          } else if (obj instanceof Value) {
            if (obj.isArray() || obj.isObject()) {
              this.eachName(iterator, obj.base);
            } else if (obj["this"]) {
              atParam(obj);
            } else {
              iterator(obj.base.value, obj.base, this);
            }
          } else if (!(obj instanceof Expansion)) {
            obj.error(`illegal parameter ${obj.compile()}`);
          }
        }
      }

      renameParam(node, newNode) {
        var isNode, replacement;
        isNode = function(candidate) {
          return candidate === node;
        };
        replacement = (node, parent) => {
          var key;
          if (parent instanceof Obj) {
            key = node;
            if (node["this"]) {
              key = node.properties[0].name;
            }
            return new Assign(new Value(key), newNode, 'object');
          } else {
            return newNode;
          }
        };
        return this.replaceInContext(isNode, replacement);
      }

    };

    Param.__super__ = superClass.prototype;

    Param.prototype.children = ['name', 'value'];

    return Param;

  })(Base);

  exports.Splat = Splat = (function(superClass) {
    class Splat extends superClass {
      constructor(name) {
        super();
        this.name = name.compile ? name : new Literal(name);
      }

      assigns(name) {
        return this.name.assigns(name);
      }

      compileToFragments(o) {
        return [this.makeCode('...'), ...this.name.compileToFragments(o)];
      }

      unwrap() {
        return this.name;
      }

    };

    Splat.__super__ = superClass.prototype;

    Splat.prototype.children = ['name'];

    Splat.prototype.isAssignable = YES;

    return Splat;

  })(Base);

  exports.Expansion = Expansion = (function(superClass) {
    class Expansion extends superClass {
      compileNode(o) {
        return this.error('Expansion must be used inside a destructuring assignment or parameter list');
      }

      asReference(o) {
        return this;
      }

      eachName(iterator) {}

    };

    Expansion.__super__ = superClass.prototype;

    Expansion.prototype.isComplex = NO;

    return Expansion;

  })(Base);

  exports.While = While = (function(superClass) {
    class While extends superClass {
      constructor(condition, options) {
        super();
        this.condition = (options != null ? options.invert : void 0) ? condition.invert() : condition;
        this.guard = options != null ? options.guard : void 0;
      }

      makeReturn(res) {
        if (res) {
          return While.__super__.makeReturn.call(this, ...arguments);
        } else {
          this.returns = !this.jumps({
            loop: true
          });
          return this;
        }
      }

      addBody(body1) {
        this.body = body1;
        return this;
      }

      jumps() {
        var expressions, j, jumpNode, len1, node;
        expressions = this.body.expressions;
        if (!expressions.length) {
          return false;
        }
        for (j = 0, len1 = expressions.length; j < len1; j++) {
          node = expressions[j];
          if (jumpNode = node.jumps({
            loop: true
          })) {
            return jumpNode;
          }
        }
        return false;
      }

      compileNode(o) {
        var answer, body, rvar, set;
        o.indent += TAB;
        set = '';
        body = this.body;
        if (body.isEmpty()) {
          body = this.makeCode('');
        } else {
          if (this.returns) {
            body.makeReturn(rvar = o.scope.freeVariable('results'));
            set = `${this.tab}${rvar} = [];\n`;
          }
          if (this.guard) {
            if (body.expressions.length > 1) {
              body.expressions.unshift(new If((new Parens(this.guard)).invert(), new StatementLiteral("continue")));
            } else {
              if (this.guard) {
                body = Block.wrap([new If(this.guard, body)]);
              }
            }
          }
          body = [].concat(this.makeCode("\n"), body.compileToFragments(o, LEVEL_TOP), this.makeCode(`\n${this.tab}`));
        }
        answer = [].concat(this.makeCode(set + this.tab + "while ("), this.condition.compileToFragments(o, LEVEL_PAREN), this.makeCode(") {"), body, this.makeCode("}"));
        if (this.returns) {
          answer.push(this.makeCode(`\n${this.tab}return ${rvar};`));
        }
        return answer;
      }

    };

    While.__super__ = superClass.prototype;

    While.prototype.children = ['condition', 'guard', 'body'];

    While.prototype.isStatement = YES;

    return While;

  })(Base);

  exports.Op = Op = (function(superClass) {
    var CONVERSIONS, INVERSIONS;

    class Op extends superClass {
      constructor(op, first, second, flip) {
        if (op === 'in') {
          return new In(first, second);
        }
        if (op === 'do') {
          return Op.prototype.generateDo(first);
        }
        if (op === 'new') {
          if (first instanceof Call && !first["do"] && !first.isNew) {
            return first.newInstance();
          }
          if (first instanceof Code && first.bound || first["do"]) {
            first = new Parens(first);
          }
        }
        super();
        this.operator = CONVERSIONS[op] || op;
        this.first = first;
        this.second = second;
        this.flip = !!flip;
        return this;
      }

      isNumber() {
        var ref3;
        return this.isUnary() && ((ref3 = this.operator) === '+' || ref3 === '-') && this.first instanceof Value && this.first.isNumber();
      }

      isAwait() {
        return this.operator === 'await';
      }

      isYield() {
        var ref3;
        return (ref3 = this.operator) === 'yield' || ref3 === 'yield*';
      }

      isUnary() {
        return !this.second;
      }

      isComplex() {
        return !this.isNumber();
      }

      isChainable() {
        var ref3;
        return (ref3 = this.operator) === '<' || ref3 === '>' || ref3 === '>=' || ref3 === '<=' || ref3 === '===' || ref3 === '!==';
      }

      invert() {
        var allInvertable, curr, fst, op, ref3;
        if (this.isChainable() && this.first.isChainable()) {
          allInvertable = true;
          curr = this;
          while (curr && curr.operator) {
            allInvertable && (allInvertable = curr.operator in INVERSIONS);
            curr = curr.first;
          }
          if (!allInvertable) {
            return new Parens(this).invert();
          }
          curr = this;
          while (curr && curr.operator) {
            curr.invert = !curr.invert;
            curr.operator = INVERSIONS[curr.operator];
            curr = curr.first;
          }
          return this;
        } else if (op = INVERSIONS[this.operator]) {
          this.operator = op;
          if (this.first.unwrap() instanceof Op) {
            this.first.invert();
          }
          return this;
        } else if (this.second) {
          return new Parens(this).invert();
        } else if (this.operator === '!' && (fst = this.first.unwrap()) instanceof Op && ((ref3 = fst.operator) === '!' || ref3 === 'in' || ref3 === 'instanceof')) {
          return fst;
        } else {
          return new Op('!', this);
        }
      }

      unfoldSoak(o) {
        var ref3;
        return ((ref3 = this.operator) === '++' || ref3 === '--' || ref3 === 'delete') && unfoldSoak(o, this, 'first');
      }

      generateDo(exp) {
        var call, func, j, len1, param, passedParams, ref, ref3;
        passedParams = [];
        func = exp instanceof Assign && (ref = exp.value.unwrap()) instanceof Code ? ref : exp;
        ref3 = func.params || [];
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          param = ref3[j];
          if (param.value) {
            passedParams.push(param.value);
            delete param.value;
          } else {
            passedParams.push(param);
          }
        }
        call = new Call(exp, passedParams);
        call["do"] = true;
        return call;
      }

      compileNode(o) {
        var answer, isChain, lhs, message, ref3, rhs;
        isChain = this.isChainable() && this.first.isChainable();
        if (!isChain) {
          this.first.front = this.front;
        }
        if (this.operator === 'delete' && o.scope.check(this.first.unwrapAll().value)) {
          this.error('delete operand may not be argument or var');
        }
        if ((ref3 = this.operator) === '--' || ref3 === '++') {
          message = isUnassignable(this.first.unwrapAll().value);
          if (message) {
            this.first.error(message);
          }
        }
        if (this.isYield() || this.isAwait()) {
          return this.compileContinuation(o);
        }
        if (this.isUnary()) {
          return this.compileUnary(o);
        }
        if (isChain) {
          return this.compileChain(o);
        }
        switch (this.operator) {
          case '?':
            return this.compileExistence(o);
          case '**':
            return this.compilePower(o);
          case '//':
            return this.compileFloorDivision(o);
          case '%%':
            return this.compileModulo(o);
          default:
            lhs = this.first.compileToFragments(o, LEVEL_OP);
            rhs = this.second.compileToFragments(o, LEVEL_OP);
            answer = [].concat(lhs, this.makeCode(` ${this.operator} `), rhs);
            if (o.level <= LEVEL_OP) {
              return answer;
            } else {
              return this.wrapInBraces(answer);
            }
        }
      }

      compileChain(o) {
        var fragments, fst, ref3, shared;
        ref3 = this.first.second.cache(o), this.first.second = ref3[0], shared = ref3[1];
        fst = this.first.compileToFragments(o, LEVEL_OP);
        fragments = fst.concat(this.makeCode(` ${(this.invert ? '&&' : '||')} `), shared.compileToFragments(o), this.makeCode(` ${this.operator} `), this.second.compileToFragments(o, LEVEL_OP));
        return this.wrapInBraces(fragments);
      }

      compileExistence(o) {
        var fst, ref;
        if (this.first.isComplex()) {
          ref = new IdentifierLiteral(o.scope.freeVariable('ref'));
          fst = new Parens(new Assign(ref, this.first));
        } else {
          fst = this.first;
          ref = fst;
        }
        return new If(new Existence(fst), ref, {
          type: 'if'
        }).addElse(this.second).compileToFragments(o);
      }

      compileUnary(o) {
        var op, parts, plusMinus;
        parts = [];
        op = this.operator;
        parts.push([this.makeCode(op)]);
        if (op === '!' && this.first instanceof Existence) {
          this.first.negated = !this.first.negated;
          return this.first.compileToFragments(o);
        }
        if (o.level >= LEVEL_ACCESS) {
          return (new Parens(this)).compileToFragments(o);
        }
        plusMinus = op === '+' || op === '-';
        if ((op === 'new' || op === 'typeof' || op === 'delete') || plusMinus && this.first instanceof Op && this.first.operator === op) {
          parts.push([this.makeCode(' ')]);
        }
        if ((plusMinus && this.first instanceof Op) || (op === 'new' && this.first.isStatement(o))) {
          this.first = new Parens(this.first);
        }
        parts.push(this.first.compileToFragments(o, LEVEL_OP));
        if (this.flip) {
          parts.reverse();
        }
        return this.joinFragmentArrays(parts, '');
      }

      compileContinuation(o) {
        var op, parts, ref3, ref4;
        parts = [];
        op = this.operator;
        if (o.scope.parent == null) {
          this.error(`${this.operator} can only occur inside functions`);
        }
        if (((ref3 = o.scope.method) != null ? ref3.bound : void 0) && o.scope.method.isGenerator) {
          this.error('yield cannot occur inside bound (fat arrow) functions');
        }
        if (indexOf.call(Object.keys(this.first), 'expression') >= 0 && !(this.first instanceof Throw)) {
          if (this.first.expression != null) {
            parts.push(this.first.expression.compileToFragments(o, LEVEL_OP));
          }
        } else {
          if (o.level >= LEVEL_PAREN) {
            parts.push([this.makeCode("(")]);
          }
          parts.push([this.makeCode(op)]);
          if (((ref4 = this.first.base) != null ? ref4.value : void 0) !== '') {
            parts.push([this.makeCode(" ")]);
          }
          parts.push(this.first.compileToFragments(o, LEVEL_OP));
          if (o.level >= LEVEL_PAREN) {
            parts.push([this.makeCode(")")]);
          }
        }
        return this.joinFragmentArrays(parts, '');
      }

      compilePower(o) {
        var pow;
        pow = new Value(new IdentifierLiteral('Math'), [new Access(new PropertyName('pow'))]);
        return new Call(pow, [this.first, this.second]).compileToFragments(o);
      }

      compileFloorDivision(o) {
        var div, floor, second;
        floor = new Value(new IdentifierLiteral('Math'), [new Access(new PropertyName('floor'))]);
        second = this.second.isComplex() ? new Parens(this.second) : this.second;
        div = new Op('/', this.first, second);
        return new Call(floor, [div]).compileToFragments(o);
      }

      compileModulo(o) {
        var mod;
        mod = new Value(new Literal(utility('modulo', o)));
        return new Call(mod, [this.first, this.second]).compileToFragments(o);
      }

      toString(idt) {
        return Op.__super__.toString.call(this, idt, this.constructor.name + ' ' + this.operator);
      }

    };

    Op.__super__ = superClass.prototype;

    CONVERSIONS = {
      '==': '===',
      '!=': '!==',
      'of': 'in',
      'yieldfrom': 'yield*'
    };

    INVERSIONS = {
      '!==': '===',
      '===': '!=='
    };

    Op.prototype.children = ['first', 'second'];

    return Op;

  })(Base);

  exports.In = In = (function(superClass) {
    class In extends superClass {
      constructor(object, array) {
        super();
        this.object = object;
        this.array = array;
      }

      compileNode(o) {
        var hasSplat, j, len1, obj, ref3;
        if (this.array instanceof Value && this.array.isArray() && this.array.base.objects.length) {
          ref3 = this.array.base.objects;
          for (j = 0, len1 = ref3.length; j < len1; j++) {
            obj = ref3[j];
            if (!(obj instanceof Splat)) {
              continue;
            }
            hasSplat = true;
            break;
          }
          if (!hasSplat) {
            return this.compileOrTest(o);
          }
        }
        return this.compileLoopTest(o);
      }

      compileOrTest(o) {
        var cmp, cnj, i, item, j, len1, ref, ref3, ref4, ref5, sub, tests;
        ref3 = this.object.cache(o, LEVEL_OP), sub = ref3[0], ref = ref3[1];
        ref4 = this.negated ? [' !== ', ' && '] : [' === ', ' || '], cmp = ref4[0], cnj = ref4[1];
        tests = [];
        ref5 = this.array.base.objects;
        for (i = j = 0, len1 = ref5.length; j < len1; i = ++j) {
          item = ref5[i];
          if (i) {
            tests.push(this.makeCode(cnj));
          }
          tests = tests.concat((i ? ref : sub), this.makeCode(cmp), item.compileToFragments(o, LEVEL_ACCESS));
        }
        if (o.level < LEVEL_OP) {
          return tests;
        } else {
          return this.wrapInBraces(tests);
        }
      }

      compileLoopTest(o) {
        var fragments, ref, ref3, sub;
        ref3 = this.object.cache(o, LEVEL_LIST), sub = ref3[0], ref = ref3[1];
        fragments = [].concat(this.makeCode(utility('indexOf', o) + ".call("), this.array.compileToFragments(o, LEVEL_LIST), this.makeCode(", "), ref, this.makeCode(") " + (this.negated ? '< 0' : '>= 0')));
        if (fragmentsToText(sub) === fragmentsToText(ref)) {
          return fragments;
        }
        fragments = sub.concat(this.makeCode(', '), fragments);
        if (o.level < LEVEL_LIST) {
          return fragments;
        } else {
          return this.wrapInBraces(fragments);
        }
      }

      toString(idt) {
        return In.__super__.toString.call(this, idt, this.constructor.name + (this.negated ? '!' : ''));
      }

    };

    In.__super__ = superClass.prototype;

    In.prototype.children = ['object', 'array'];

    In.prototype.invert = NEGATE;

    return In;

  })(Base);

  exports.Try = Try = (function(superClass) {
    class Try extends superClass {
      constructor(attempt, errorVariable, recovery, ensure) {
        super();
        this.attempt = attempt;
        this.errorVariable = errorVariable;
        this.recovery = recovery;
        this.ensure = ensure;
      }

      jumps(o) {
        var ref3;
        return this.attempt.jumps(o) || ((ref3 = this.recovery) != null ? ref3.jumps(o) : void 0);
      }

      makeReturn(res) {
        if (this.attempt) {
          this.attempt = this.attempt.makeReturn(res);
        }
        if (this.recovery) {
          this.recovery = this.recovery.makeReturn(res);
        }
        return this;
      }

      compileNode(o) {
        var catchPart, ensurePart, generatedErrorVariableName, message, placeholder, tryPart;
        o.indent += TAB;
        tryPart = this.attempt.compileToFragments(o, LEVEL_TOP);
        catchPart = this.recovery ? (generatedErrorVariableName = o.scope.freeVariable('error', {
          reserve: false
        }), placeholder = new IdentifierLiteral(generatedErrorVariableName), this.errorVariable ? (message = isUnassignable(this.errorVariable.unwrapAll().value), message ? this.errorVariable.error(message) : void 0, this.recovery.unshift(new Assign(this.errorVariable, placeholder))) : void 0, [].concat(this.makeCode(" catch ("), placeholder.compileToFragments(o), this.makeCode(") {\n"), this.recovery.compileToFragments(o, LEVEL_TOP), this.makeCode(`\n${this.tab}}`))) : !(this.ensure || this.recovery) ? (generatedErrorVariableName = o.scope.freeVariable('error', {
          reserve: false
        }), [this.makeCode(` catch (${generatedErrorVariableName}) {}`)]) : [];
        ensurePart = this.ensure ? [].concat(this.makeCode(" finally {\n"), this.ensure.compileToFragments(o, LEVEL_TOP), this.makeCode(`\n${this.tab}}`)) : [];
        return [].concat(this.makeCode(`${this.tab}try {\n`), tryPart, this.makeCode(`\n${this.tab}}`), catchPart, ensurePart);
      }

    };

    Try.__super__ = superClass.prototype;

    Try.prototype.children = ['attempt', 'recovery', 'ensure'];

    Try.prototype.isStatement = YES;

    return Try;

  })(Base);

  exports.Throw = Throw = (function(superClass) {
    class Throw extends superClass {
      constructor(expression1) {
        super();
        this.expression = expression1;
      }

      compileNode(o) {
        return [].concat(this.makeCode(this.tab + "throw "), this.expression.compileToFragments(o), this.makeCode(";"));
      }

    };

    Throw.__super__ = superClass.prototype;

    Throw.prototype.children = ['expression'];

    Throw.prototype.isStatement = YES;

    Throw.prototype.jumps = NO;

    Throw.prototype.makeReturn = THIS;

    return Throw;

  })(Base);

  exports.Existence = Existence = (function(superClass) {
    class Existence extends superClass {
      constructor(expression1) {
        super();
        this.expression = expression1;
      }

      compileNode(o) {
        var cmp, cnj, code, ref3;
        this.expression.front = this.front;
        code = this.expression.compile(o, LEVEL_OP);
        if (this.expression.unwrap() instanceof IdentifierLiteral && !o.scope.check(code)) {
          ref3 = this.negated ? ['===', '||'] : ['!==', '&&'], cmp = ref3[0], cnj = ref3[1];
          code = `typeof ${code} ${cmp} \"undefined\" ${cnj} ${code} ${cmp} null`;
        } else {
          code = `${code} ${(this.negated ? '==' : '!=')} null`;
        }
        return [this.makeCode(o.level <= LEVEL_COND ? code : `(${code})`)];
      }

    };

    Existence.__super__ = superClass.prototype;

    Existence.prototype.children = ['expression'];

    Existence.prototype.invert = NEGATE;

    return Existence;

  })(Base);

  exports.Parens = Parens = (function(superClass) {
    class Parens extends superClass {
      constructor(body1) {
        super();
        this.body = body1;
      }

      unwrap() {
        return this.body;
      }

      isComplex() {
        return this.body.isComplex();
      }

      compileNode(o) {
        var bare, expr, fragments;
        expr = this.body.unwrap();
        if (expr instanceof Value && expr.isAtomic()) {
          expr.front = this.front;
          return expr.compileToFragments(o);
        }
        fragments = expr.compileToFragments(o, LEVEL_PAREN);
        bare = o.level < LEVEL_OP && (expr instanceof Op || expr instanceof Call || (expr instanceof For && expr.returns));
        if (bare) {
          return fragments;
        } else {
          return this.wrapInBraces(fragments);
        }
      }

    };

    Parens.__super__ = superClass.prototype;

    Parens.prototype.children = ['body'];

    return Parens;

  })(Base);

  exports.StringWithInterpolations = StringWithInterpolations = (function(superClass) {
    class StringWithInterpolations extends superClass {
      constructor(body1) {
        super();
        this.body = body1;
      }

      unwrap() {
        return this;
      }

      isComplex() {
        return this.body.isComplex();
      }

      compileNode(o) {
        var element, elements, expr, fragments, j, len1, value;
        expr = this.body.unwrap();
        elements = [];
        expr.traverseChildren(false, function(node) {
          if (node instanceof StringLiteral) {
            elements.push(node);
            return true;
          } else if (node instanceof Parens) {
            elements.push(node);
            return false;
          }
          return true;
        });
        fragments = [];
        fragments.push(this.makeCode('`'));
        for (j = 0, len1 = elements.length; j < len1; j++) {
          element = elements[j];
          if (element instanceof StringLiteral) {
            value = element.value.slice(1, -1);
            value = value.replace(/(\\*)(`|\$\{)/g, function(match, backslashes, toBeEscaped) {
              if (backslashes.length % 2 === 0) {
                return `${backslashes}\\${toBeEscaped}`;
              } else {
                return match;
              }
            });
            fragments.push(this.makeCode(value));
          } else {
            fragments.push(this.makeCode('${'));
            fragments.push(...element.compileToFragments(o, LEVEL_PAREN));
            fragments.push(this.makeCode('}'));
          }
        }
        fragments.push(this.makeCode('`'));
        return fragments;
      }

    };

    StringWithInterpolations.__super__ = superClass.prototype;

    StringWithInterpolations.prototype.children = ['body'];

    return StringWithInterpolations;

  })(Base);

  exports.For = For = (function(superClass) {
    class For extends superClass {
      constructor(body, source) {
        var ref3;
        super();
        this.source = source.source, this.guard = source.guard, this.step = source.step, this.name = source.name, this.index = source.index;
        this.body = Block.wrap([body]);
        this.own = !!source.own;
        this.object = !!source.object;
        this.from = !!source.from;
        if (this.from && this.index) {
          this.index.error('cannot use index with for-from');
        }
        if (this.own && !this.object) {
          source.ownTag.error(`cannot use own with for-${(this.from ? 'from' : 'in')}`);
        }
        if (this.object) {
          ref3 = [this.index, this.name], this.name = ref3[0], this.index = ref3[1];
        }
        if (this.index instanceof Value) {
          this.index.error('index cannot be a pattern matching expression');
        }
        this.range = this.source instanceof Value && this.source.base instanceof Range && !this.source.properties.length && !this.from;
        this.pattern = this.name instanceof Value;
        if (this.range && this.index) {
          this.index.error('indexes do not apply to range loops');
        }
        if (this.range && this.pattern) {
          this.name.error('cannot pattern match over range loops');
        }
        this.returns = false;
      }

      compileNode(o) {
        var body, bodyFragments, compare, compareDown, declare, declareDown, defPart, defPartFragments, down, forPartFragments, guardPart, idt1, increment, index, ivar, kvar, kvarAssign, last, lvar, name, namePart, ref, ref3, ref4, resultPart, returnResult, rvar, scope, source, step, stepNum, stepVar, svar, varPart;
        body = Block.wrap([this.body]);
        ref3 = body.expressions, last = ref3[ref3.length - 1];
        if ((last != null ? last.jumps() : void 0) instanceof Return) {
          this.returns = false;
        }
        source = this.range ? this.source.base : this.source;
        scope = o.scope;
        if (!this.pattern) {
          name = this.name && (this.name.compile(o, LEVEL_LIST));
        }
        index = this.index && (this.index.compile(o, LEVEL_LIST));
        if (name && !this.pattern) {
          scope.find(name);
        }
        if (index) {
          scope.find(index);
        }
        if (this.returns) {
          rvar = scope.freeVariable('results');
        }
        if (this.from) {
          if (this.pattern) {
            ivar = scope.freeVariable('x', {
              single: true
            });
          }
        } else {
          ivar = (this.object && index) || scope.freeVariable('i', {
            single: true
          });
        }
        kvar = ((this.range || this.from) && name) || index || ivar;
        kvarAssign = kvar !== ivar ? `${kvar} = ` : "";
        if (this.step && !this.range) {
          ref4 = this.cacheToCodeFragments(this.step.cache(o, LEVEL_LIST, isComplexOrAssignable)), step = ref4[0], stepVar = ref4[1];
          if (this.step.isNumber()) {
            stepNum = Number(stepVar);
          }
        }
        if (this.pattern) {
          name = ivar;
        }
        varPart = '';
        guardPart = '';
        defPart = '';
        idt1 = this.tab + TAB;
        if (this.range) {
          forPartFragments = source.compileToFragments(merge(o, {
            index: ivar,
            name: name,
            step: this.step,
            isComplex: isComplexOrAssignable
          }));
        } else {
          svar = this.source.compile(o, LEVEL_LIST);
          if ((name || this.own) && !(this.source.unwrap() instanceof IdentifierLiteral)) {
            defPart += `${this.tab}${(ref = scope.freeVariable('ref'))} = ${svar};\n`;
            svar = ref;
          }
          if (name && !this.pattern && !this.from) {
            namePart = `${name} = ${svar}[${kvar}]`;
          }
          if (!this.object && !this.from) {
            if (step !== stepVar) {
              defPart += `${this.tab}${step};\n`;
            }
            down = stepNum < 0;
            if (!(this.step && (stepNum != null) && down)) {
              lvar = scope.freeVariable('len');
            }
            declare = `${kvarAssign}${ivar} = 0, ${lvar} = ${svar}.length`;
            declareDown = `${kvarAssign}${ivar} = ${svar}.length - 1`;
            compare = `${ivar} < ${lvar}`;
            compareDown = `${ivar} >= 0`;
            if (this.step) {
              if (stepNum != null) {
                if (down) {
                  compare = compareDown;
                  declare = declareDown;
                }
              } else {
                compare = `${stepVar} > 0 ? ${compare} : ${compareDown}`;
                declare = `(${stepVar} > 0 ? (${declare}) : ${declareDown})`;
              }
              increment = `${ivar} += ${stepVar}`;
            } else {
              increment = `${(kvar !== ivar ? `++${ivar}` : `${ivar}++`)}`;
            }
            forPartFragments = [this.makeCode(`${declare}; ${compare}; ${kvarAssign}${increment}`)];
          }
        }
        if (this.returns) {
          resultPart = `${this.tab}${rvar} = [];\n`;
          returnResult = `\n${this.tab}return ${rvar};`;
          body.makeReturn(rvar);
        }
        if (this.guard) {
          if (body.expressions.length > 1) {
            body.expressions.unshift(new If((new Parens(this.guard)).invert(), new StatementLiteral("continue")));
          } else {
            if (this.guard) {
              body = Block.wrap([new If(this.guard, body)]);
            }
          }
        }
        if (this.pattern) {
          body.expressions.unshift(new Assign(this.name, this.from ? new IdentifierLiteral(kvar) : new Literal(`${svar}[${kvar}]`)));
        }
        defPartFragments = [].concat(this.makeCode(defPart), this.pluckDirectCall(o, body));
        if (namePart) {
          varPart = `\n${idt1}${namePart};`;
        }
        if (this.object) {
          forPartFragments = [this.makeCode(`${kvar} in ${svar}`)];
          if (this.own) {
            guardPart = `\n${idt1}if (!${utility('hasProp', o)}.call(${svar}, ${kvar})) continue;`;
          }
        } else if (this.from) {
          forPartFragments = [this.makeCode(`${kvar} of ${svar}`)];
        }
        bodyFragments = body.compileToFragments(merge(o, {
          indent: idt1
        }), LEVEL_TOP);
        if (bodyFragments && bodyFragments.length > 0) {
          bodyFragments = [].concat(this.makeCode("\n"), bodyFragments, this.makeCode("\n"));
        }
        return [].concat(defPartFragments, this.makeCode(`${resultPart || ''}${this.tab}for (`), forPartFragments, this.makeCode(`) {${guardPart}${varPart}`), bodyFragments, this.makeCode(`${this.tab}}${returnResult || ''}`));
      }

      pluckDirectCall(o, body) {
        var base, defs, expr, fn, idx, j, len1, ref, ref3, ref4, ref5, ref6, ref7, ref8, ref9, val;
        defs = [];
        ref3 = body.expressions;
        for (idx = j = 0, len1 = ref3.length; j < len1; idx = ++j) {
          expr = ref3[idx];
          expr = expr.unwrapAll();
          if (!(expr instanceof Call)) {
            continue;
          }
          val = (ref4 = expr.variable) != null ? ref4.unwrapAll() : void 0;
          if (!((val instanceof Code) || (val instanceof Value && ((ref5 = val.base) != null ? ref5.unwrapAll() : void 0) instanceof Code && val.properties.length === 1 && ((ref6 = (ref7 = val.properties[0].name) != null ? ref7.value : void 0) === 'call' || ref6 === 'apply')))) {
            continue;
          }
          fn = ((ref8 = val.base) != null ? ref8.unwrapAll() : void 0) || val;
          ref = new IdentifierLiteral(o.scope.freeVariable('fn'));
          base = new Value(ref);
          if (val.base) {
            ref9 = [base, val], val.base = ref9[0], base = ref9[1];
          }
          body.expressions[idx] = new Call(base, expr.args);
          defs = defs.concat(this.makeCode(this.tab), new Assign(ref, fn).compileToFragments(o, LEVEL_TOP), this.makeCode(';\n'));
        }
        return defs;
      }

    };

    For.__super__ = superClass.prototype;

    For.prototype.children = ['body', 'source', 'guard', 'step'];

    return For;

  })(While);

  exports.Switch = Switch = (function(superClass) {
    class Switch extends superClass {
      constructor(subject, cases, otherwise) {
        super();
        this.subject = subject;
        this.cases = cases;
        this.otherwise = otherwise;
      }

      jumps(o = {
          block: true
        }) {
        var block, conds, j, jumpNode, len1, ref3, ref4, ref5;
        ref3 = this.cases;
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          ref4 = ref3[j], conds = ref4[0], block = ref4[1];
          if (jumpNode = block.jumps(o)) {
            return jumpNode;
          }
        }
        return (ref5 = this.otherwise) != null ? ref5.jumps(o) : void 0;
      }

      makeReturn(res) {
        var j, len1, pair, ref3, ref4;
        ref3 = this.cases;
        for (j = 0, len1 = ref3.length; j < len1; j++) {
          pair = ref3[j];
          pair[1].makeReturn(res);
        }
        if (res) {
          this.otherwise || (this.otherwise = new Block([new Literal('void 0')]));
        }
        if ((ref4 = this.otherwise) != null) {
          ref4.makeReturn(res);
        }
        return this;
      }

      compileNode(o) {
        var block, body, cond, conditions, expr, fragments, i, idt1, idt2, j, k, len1, len2, ref3, ref4, ref5;
        idt1 = o.indent + TAB;
        idt2 = o.indent = idt1 + TAB;
        fragments = [].concat(this.makeCode(this.tab + "switch ("), (this.subject ? this.subject.compileToFragments(o, LEVEL_PAREN) : this.makeCode("false")), this.makeCode(") {\n"));
        ref3 = this.cases;
        for (i = j = 0, len1 = ref3.length; j < len1; i = ++j) {
          ref4 = ref3[i], conditions = ref4[0], block = ref4[1];
          ref5 = flatten([conditions]);
          for (k = 0, len2 = ref5.length; k < len2; k++) {
            cond = ref5[k];
            if (!this.subject) {
              cond = cond.invert();
            }
            fragments = fragments.concat(this.makeCode(idt1 + "case "), cond.compileToFragments(o, LEVEL_PAREN), this.makeCode(":\n"));
          }
          if ((body = block.compileToFragments(o, LEVEL_TOP)).length > 0) {
            fragments = fragments.concat(body, this.makeCode('\n'));
          }
          if (i === this.cases.length - 1 && !this.otherwise) {
            break;
          }
          expr = this.lastNonComment(block.expressions);
          if (expr instanceof Return || (expr instanceof Literal && expr.jumps() && expr.value !== 'debugger')) {
            continue;
          }
          fragments.push(cond.makeCode(idt2 + 'break;\n'));
        }
        if (this.otherwise && this.otherwise.expressions.length) {
          fragments.push(this.makeCode(idt1 + "default:\n"), ...this.otherwise.compileToFragments(o, LEVEL_TOP), this.makeCode("\n"));
        }
        fragments.push(this.makeCode(this.tab + '}'));
        return fragments;
      }

    };

    Switch.__super__ = superClass.prototype;

    Switch.prototype.children = ['subject', 'cases', 'otherwise'];

    Switch.prototype.isStatement = YES;

    return Switch;

  })(Base);

  exports.If = If = (function(superClass) {
    class If extends superClass {
      constructor(condition, body1, options = {}) {
        super();
        this.body = body1;
        this.condition = options.type === 'unless' ? condition.invert() : condition;
        this.elseBody = null;
        this.isChain = false;
        this.soak = options.soak;
      }

      bodyNode() {
        var ref3;
        return (ref3 = this.body) != null ? ref3.unwrap() : void 0;
      }

      elseBodyNode() {
        var ref3;
        return (ref3 = this.elseBody) != null ? ref3.unwrap() : void 0;
      }

      addElse(elseBody) {
        if (this.isChain) {
          this.elseBodyNode().addElse(elseBody);
        } else {
          this.isChain = elseBody instanceof If;
          this.elseBody = this.ensureBlock(elseBody);
          this.elseBody.updateLocationDataIfMissing(elseBody.locationData);
        }
        return this;
      }

      isStatement(o) {
        var ref3;
        return (o != null ? o.level : void 0) === LEVEL_TOP || this.bodyNode().isStatement(o) || ((ref3 = this.elseBodyNode()) != null ? ref3.isStatement(o) : void 0);
      }

      jumps(o) {
        var ref3;
        return this.body.jumps(o) || ((ref3 = this.elseBody) != null ? ref3.jumps(o) : void 0);
      }

      compileNode(o) {
        if (this.isStatement(o)) {
          return this.compileStatement(o);
        } else {
          return this.compileExpression(o);
        }
      }

      makeReturn(res) {
        if (res) {
          this.elseBody || (this.elseBody = new Block([new Literal('void 0')]));
        }
        this.body && (this.body = new Block([this.body.makeReturn(res)]));
        this.elseBody && (this.elseBody = new Block([this.elseBody.makeReturn(res)]));
        return this;
      }

      ensureBlock(node) {
        if (node instanceof Block) {
          return node;
        } else {
          return new Block([node]);
        }
      }

      compileStatement(o) {
        var answer, body, child, cond, exeq, ifPart, indent;
        child = del(o, 'chainChild');
        exeq = del(o, 'isExistentialEquals');
        if (exeq) {
          return new If(this.condition.invert(), this.elseBodyNode(), {
            type: 'if'
          }).compileToFragments(o);
        }
        indent = o.indent + TAB;
        cond = this.condition.compileToFragments(o, LEVEL_PAREN);
        body = this.ensureBlock(this.body).compileToFragments(merge(o, {
          indent: indent
        }));
        ifPart = [].concat(this.makeCode("if ("), cond, this.makeCode(") {\n"), body, this.makeCode(`\n${this.tab}}`));
        if (!child) {
          ifPart.unshift(this.makeCode(this.tab));
        }
        if (!this.elseBody) {
          return ifPart;
        }
        answer = ifPart.concat(this.makeCode(' else '));
        if (this.isChain) {
          o.chainChild = true;
          answer = answer.concat(this.elseBody.unwrap().compileToFragments(o, LEVEL_TOP));
        } else {
          answer = answer.concat(this.makeCode("{\n"), this.elseBody.compileToFragments(merge(o, {
            indent: indent
          }), LEVEL_TOP), this.makeCode(`\n${this.tab}}`));
        }
        return answer;
      }

      compileExpression(o) {
        var alt, body, cond, fragments;
        cond = this.condition.compileToFragments(o, LEVEL_COND);
        body = this.bodyNode().compileToFragments(o, LEVEL_LIST);
        alt = this.elseBodyNode() ? this.elseBodyNode().compileToFragments(o, LEVEL_LIST) : [this.makeCode('void 0')];
        fragments = cond.concat(this.makeCode(" ? "), body, this.makeCode(" : "), alt);
        if (o.level >= LEVEL_COND) {
          return this.wrapInBraces(fragments);
        } else {
          return fragments;
        }
      }

      unfoldSoak() {
        return this.soak && this;
      }

    };

    If.__super__ = superClass.prototype;

    If.prototype.children = ['condition', 'body', 'elseBody'];

    return If;

  })(Base);

  UTILITIES = {
    extend: function(o) {
      return `function(child, parent) { for (var key in parent) { if (${utility('hasProp', o)}.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; }`;
    },
    bind: function() {
      return 'function(fn, me){ return function(){ return fn.apply(me, arguments); }; }';
    },
    indexOf: function() {
      return "[].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; }";
    },
    modulo: function() {
      return "function(a, b) { return (+a % (b = +b) + b) % b; }";
    },
    hasProp: function() {
      return '{}.hasOwnProperty';
    },
    slice: function() {
      return '[].slice';
    }
  };

  LEVEL_TOP = 1;

  LEVEL_PAREN = 2;

  LEVEL_LIST = 3;

  LEVEL_COND = 4;

  LEVEL_OP = 5;

  LEVEL_ACCESS = 6;

  TAB = '  ';

  SIMPLENUM = /^[+-]?\d+$/;

  utility = function(name, o) {
    var ref, root;
    root = o.scope.root;
    if (name in root.utilities) {
      return root.utilities[name];
    } else {
      ref = root.freeVariable(name);
      root.assign(ref, UTILITIES[name](o));
      return root.utilities[name] = ref;
    }
  };

  multident = function(code, tab) {
    code = code.replace(/\n/g, '$&' + tab);
    return code.replace(/\s+$/, '');
  };

  isLiteralArguments = function(node) {
    return node instanceof IdentifierLiteral && node.value === 'arguments';
  };

  isLiteralThis = function(node) {
    return node instanceof ThisLiteral || (node instanceof Code && node.bound) || node instanceof SuperCall;
  };

  isComplexOrAssignable = function(node) {
    return node.isComplex() || (typeof node.isAssignable === "function" ? node.isAssignable() : void 0);
  };

  unfoldSoak = function(o, parent, name) {
    var ifn;
    if (!(ifn = parent[name].unfoldSoak(o))) {
      return;
    }
    parent[name] = ifn.body;
    ifn.body = new Value(parent);
    return ifn;
  };

}).call(this);