mirror of https://github.com/webpack/webpack.git
80 lines
2.2 KiB
JavaScript
80 lines
2.2 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.hooks.program.tap("HarmonyDetectionParserPlugin", ast => {
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const isStrictHarmony = parser.state.module.type === "javascript/esm";
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const isHarmony =
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isStrictHarmony ||
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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 compatDep = new HarmonyCompatibilityDependency();
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compatDep.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: -3
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};
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module.addDependency(compatDep);
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parser.state.harmonyParserScope = parser.state.harmonyParserScope || {};
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parser.scope.isStrict = true;
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module.buildMeta.exportsType = "namespace";
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module.buildInfo.strict = true;
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module.buildInfo.exportsArgument = "__webpack_exports__";
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if (isStrictHarmony) {
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module.buildMeta.strictHarmonyModule = true;
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module.buildInfo.moduleArgument = "__webpack_module__";
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}
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}
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});
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const skipInHarmony = () => {
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const module = parser.state.module;
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if (module && module.buildMeta && module.buildMeta.exportsType) {
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return true;
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}
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};
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const nullInHarmony = () => {
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const module = parser.state.module;
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if (module && module.buildMeta && module.buildMeta.exportsType) {
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return null;
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}
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};
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const nonHarmonyIdentifiers = ["define", "exports"];
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for (const identifer of nonHarmonyIdentifiers) {
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parser.hooks.evaluateTypeof
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.for(identifer)
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.tap("HarmonyDetectionParserPlugin", nullInHarmony);
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parser.hooks.typeof
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.for(identifer)
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.tap("HarmonyDetectionParserPlugin", skipInHarmony);
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parser.hooks.evaluate
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.for(identifer)
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.tap("HarmonyDetectionParserPlugin", nullInHarmony);
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parser.hooks.expression
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.for(identifer)
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.tap("HarmonyDetectionParserPlugin", skipInHarmony);
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parser.hooks.call
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.for(identifer)
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.tap("HarmonyDetectionParserPlugin", skipInHarmony);
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}
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}
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};
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