chushihua

node_modules/webpack/lib/dependencies/HarmonyDetectionParserPlugin.js

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