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67091efe7c
js-analyze is a tiny wrapper around esprima and escope. We don't use it anywhere but in the tool. We even already use esprima in the tool elsewhere. It creates a fair amount of additional complexity. None of the other isopackets are used as part of the isopack-building process, so it has a bunch of random special case code for it.
58 lines
1.9 KiB
JavaScript
58 lines
1.9 KiB
JavaScript
import esprima from 'esprima';
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import escope from 'escope';
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// Like esprima.parse, but annotates any thrown error with $ParseError = true.
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function esprimaParse(source) {
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try {
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return esprima.parse(source);
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} catch (e) {
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if ('index' in e && 'lineNumber' in e &&
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'column' in e && 'description' in e) {
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e.$ParseError = true;
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}
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throw e;
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}
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}
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// Analyze the JavaScript source code `source` and return a dictionary of all
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// globals which are assigned to in the package. The values in the dictionary
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// are all `true`.
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//
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// This is intended for use in detecting package-scope variables in Meteor
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// packages, where the linker needs to add a "var" statement to prevent them
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// from staying as globals.
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//
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// It only cares about assignments to variables; an assignment to a field on an
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// object (`Foo.Bar = true`) neither causes `Foo` nor `Foo.Bar` to be returned.
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export function findAssignedGlobals(source) {
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// escope's analyzer treats vars in the top-level "Program" node as globals.
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// The newline is necessary in case source ends with a comment.
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const wrappedSource = '(function () {' + source + '\n})';
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const parseTree = esprimaParse(wrappedSource);
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// We have to pass ignoreEval; otherwise, the existence of a direct eval call
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// causes escope to not bother to resolve references in the eval's scope.
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// This is because an eval can pull references inward:
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//
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// function outer() {
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// var i = 42;
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// function inner() {
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// eval('var i = 0');
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// i; // 0, not 42
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// }
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// }
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//
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// But it can't pull references outward, so for our purposes it is safe to
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// ignore.
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const scoper = escope.analyze(parseTree, {ignoreEval: true});
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const globalScope = scoper.scopes[0];
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const assignedGlobals = {};
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// Underscore is not available in this package.
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globalScope.implicit.variables.forEach((variable) => {
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assignedGlobals[variable.name] = true;
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});
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return assignedGlobals;
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}
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