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b192e215a5
* Output simple array destructuring assignments to ES2015 * Output simple object destructured assignments to ES2015 * Compile shorthand object properties to ES2015 shorthand properties This dramatically improves the appearance of destructured imports. * Compile default values in destructured assignment to ES2015 * Rename `wrapInBraces` to `wrapInParentheses`, and `compilePatternMatch` to `compileDestructuring`, for clarity; style improvements (no `==` or `!=`, etc.) * Don’t confuse the syntax highlighter * Comment Assign::compilePatternMatch a bit * Assignment expressions in conditionals are a bad practice * Optional check for existence that only checks `!== undefined`, not `!= null`, to follow ES convention that default values only apply when a variable is undefined, not falsy * Add comments; remove unnecessary array splats in function tests * The fallback destructuring code should apply default values only if `undefined`, not falsy, to follow ES spec * Support destructuring in function parameters (first pass); catch destructured reserved words * Destructured variables in function parameter lists shouldn’t be added to the function body with `var` declarations; treat splat array function parameters the legacy way to avoid rethinking #4005 * Remove redundancy in undefined-only check for existence; fix passing option to check * Fix undefined redundancy * Simplify getting the variable name * Reimplement “check for existence if not undefined” without creating a new operator * `Obj::isAssignable` should not mutate; pass `lhs` property in from `Assign` or `Code` to child arrays and objects so that those child nodes are set as allowable for destructuring * Revert changes to tests * Restore revised test for empty destructuring assignment