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40 lines
1.7 KiB
40 lines
1.7 KiB
3 years ago
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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typeof define === 'function' && define.amd ? define(factory) :
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(global = global || self, global.isReference = factory());
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}(this, (function () { 'use strict';
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function isReference(node, parent) {
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if (node.type === 'MemberExpression') {
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return !node.computed && isReference(node.object, node);
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}
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if (node.type === 'Identifier') {
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if (!parent)
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return true;
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switch (parent.type) {
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// disregard `bar` in `foo.bar`
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case 'MemberExpression': return parent.computed || node === parent.object;
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// disregard the `foo` in `class {foo(){}}` but keep it in `class {[foo](){}}`
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case 'MethodDefinition': return parent.computed;
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// disregard the `foo` in `class {foo=bar}` but keep it in `class {[foo]=bar}` and `class {bar=foo}`
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case 'FieldDefinition': return parent.computed || node === parent.value;
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// disregard the `bar` in `{ bar: foo }`, but keep it in `{ [bar]: foo }`
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case 'Property': return parent.computed || node === parent.value;
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// disregard the `bar` in `export { foo as bar }` or
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// the foo in `import { foo as bar }`
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case 'ExportSpecifier':
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case 'ImportSpecifier': return node === parent.local;
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// disregard the `foo` in `foo: while (...) { ... break foo; ... continue foo;}`
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case 'LabeledStatement':
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case 'BreakStatement':
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case 'ContinueStatement': return false;
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default: return true;
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}
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}
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return false;
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}
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return isReference;
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})));
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