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1 files changed, 92 insertions, 0 deletions

diff --git a/node_modules/webpack/lib/dependencies/HarmonyDetectionParserPlugin.js b/node_modules/webpack/lib/dependencies/HarmonyDetectionParserPlugin.js
new file mode 100644
index 00000000..062ec21a
--- /dev/null
+++ b/node_modules/webpack/lib/dependencies/HarmonyDetectionParserPlugin.js
@@ -0,0 +1,92 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const HarmonyCompatibilityDependency = require("./HarmonyCompatibilityDependency");
+const HarmonyInitDependency = require("./HarmonyInitDependency");
+
+module.exports = class HarmonyDetectionParserPlugin {
+	apply(parser) {
+		parser.hooks.program.tap("HarmonyDetectionParserPlugin", ast => {
+			const isStrictHarmony = parser.state.module.type === "javascript/esm";
+			const isHarmony =
+				isStrictHarmony ||
+				ast.body.some(statement => {
+					return /^(Import|Export).*Declaration$/.test(statement.type);
+				});
+			if (isHarmony) {
+				const module = parser.state.module;
+				const compatDep = new HarmonyCompatibilityDependency(module);
+				compatDep.loc = {
+					start: {
+						line: -1,
+						column: 0
+					},
+					end: {
+						line: -1,
+						column: 0
+					},
+					index: -3
+				};
+				module.addDependency(compatDep);
+				const initDep = new HarmonyInitDependency(module);
+				initDep.loc = {
+					start: {
+						line: -1,
+						column: 0
+					},
+					end: {
+						line: -1,
+						column: 0
+					},
+					index: -2
+				};
+				module.addDependency(initDep);
+				parser.state.harmonyParserScope = parser.state.harmonyParserScope || {};
+				parser.scope.isStrict = true;
+				module.buildMeta.exportsType = "namespace";
+				module.buildInfo.strict = true;
+				module.buildInfo.exportsArgument = "__webpack_exports__";
+				if (isStrictHarmony) {
+					module.buildMeta.strictHarmonyModule = true;
+					module.buildInfo.moduleArgument = "__webpack_module__";
+				}
+			}
+		});
+
+		const skipInHarmony = () => {
+			const module = parser.state.module;
+			if (module && module.buildMeta && module.buildMeta.exportsType) {
+				return true;
+			}
+		};
+
+		const nullInHarmony = () => {
+			const module = parser.state.module;
+			if (module && module.buildMeta && module.buildMeta.exportsType) {
+				return null;
+			}
+		};
+
+		const nonHarmonyIdentifiers = ["define", "exports"];
+		for (const identifer of nonHarmonyIdentifiers) {
+			parser.hooks.evaluateTypeof
+				.for(identifer)
+				.tap("HarmonyDetectionParserPlugin", nullInHarmony);
+			parser.hooks.typeof
+				.for(identifer)
+				.tap("HarmonyDetectionParserPlugin", skipInHarmony);
+			parser.hooks.evaluate
+				.for(identifer)
+				.tap("HarmonyDetectionParserPlugin", nullInHarmony);
+			parser.hooks.expression
+				.for(identifer)
+				.tap("HarmonyDetectionParserPlugin", skipInHarmony);
+			parser.hooks.call
+				.for(identifer)
+				.tap("HarmonyDetectionParserPlugin", skipInHarmony);
+		}
+	}
+};