57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const HarmonyCompatibilityDependency = require("./HarmonyCompatibilityDependency");
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module.exports = class HarmonyDetectionParserPlugin {
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apply(parser) {
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parser.plugin("program", (ast) => {
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const isHarmony = ast.body.some(statement => {
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return /^(Import|Export).*Declaration$/.test(statement.type);
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});
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if(isHarmony) {
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const module = parser.state.module;
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const dep = new HarmonyCompatibilityDependency(module);
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dep.loc = {
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start: {
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line: -1,
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column: 0
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},
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end: {
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line: -1,
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column: 0
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},
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index: -2
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};
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module.addDependency(dep);
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module.meta.harmonyModule = true;
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module.strict = true;
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module.exportsArgument = "__webpack_exports__";
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}
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});
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const nonHarmonyIdentifiers = ["define", "exports"];
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nonHarmonyIdentifiers.forEach(identifer => {
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parser.plugin(`evaluate typeof ${identifer}`, nullInHarmony);
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parser.plugin(`typeof ${identifer}`, skipInHarmony);
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parser.plugin(`evaluate ${identifer}`, nullInHarmony);
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parser.plugin(`expression ${identifer}`, skipInHarmony);
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parser.plugin(`call ${identifer}`, skipInHarmony);
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});
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function skipInHarmony() {
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const module = this.state.module;
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if(module && module.meta && module.meta.harmonyModule)
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return true;
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}
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function nullInHarmony() {
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const module = this.state.module;
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if(module && module.meta && module.meta.harmonyModule)
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return null;
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}
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}
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};
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