mirror of https://github.com/webpack/webpack.git
78 lines
2.4 KiB
JavaScript
78 lines
2.4 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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const HarmonyInitDependency = require("./HarmonyInitDependency");
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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 = isStrictHarmony || 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(module);
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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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const initDep = new HarmonyInitDependency(module);
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initDep.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(initDep);
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parser.state.harmonyParserScope = parser.state.harmonyParserScope || {};
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module.buildMeta.harmonyModule = true;
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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.harmonyModule)
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return true;
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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.harmonyModule)
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return null;
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};
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const nonHarmonyIdentifiers = ["define", "exports"];
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nonHarmonyIdentifiers.forEach(identifer => {
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parser.hooks.evaluateTypeof.for(identifer).tap("HarmonyDetectionParserPlugin", nullInHarmony);
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parser.hooks.typeof.for(identifer).tap("HarmonyDetectionParserPlugin", skipInHarmony);
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parser.hooks.evaluate.for(identifer).tap("HarmonyDetectionParserPlugin", nullInHarmony);
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parser.hooks.expression.for(identifer).tap("HarmonyDetectionParserPlugin", skipInHarmony);
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parser.hooks.call.for(identifer).tap("HarmonyDetectionParserPlugin", skipInHarmony);
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});
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}
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};
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