1 files changed, 117 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..0fbc7a66
--- /dev/null
+++ b/node_modules/webpack/lib/dependencies/HarmonyDetectionParserPlugin.js
@@ -0,0 +1,117 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { JAVASCRIPT_MODULE_TYPE_ESM } = require("../ModuleTypeConstants");
+const DynamicExports = require("./DynamicExports");
+const HarmonyCompatibilityDependency = require("./HarmonyCompatibilityDependency");
+const HarmonyExports = require("./HarmonyExports");
+
+/** @typedef {import("../Module").BuildMeta} BuildMeta */
+/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
+/** @typedef {import("./HarmonyModulesPlugin").HarmonyModulesPluginOptions} HarmonyModulesPluginOptions */
+
+module.exports = class HarmonyDetectionParserPlugin {
+	/**
+	 * @param {HarmonyModulesPluginOptions} options options
+	 */
+	constructor(options) {
+		const { topLevelAwait = false } = options || {};
+		this.topLevelAwait = topLevelAwait;
+	}
+
+	/**
+	 * @param {JavascriptParser} parser the parser
+	 * @returns {void}
+	 */
+	apply(parser) {
+		parser.hooks.program.tap("HarmonyDetectionParserPlugin", ast => {
+			const isStrictHarmony =
+				parser.state.module.type === JAVASCRIPT_MODULE_TYPE_ESM;
+			const isHarmony =
+				isStrictHarmony ||
+				ast.body.some(
+					statement =>
+						statement.type === "ImportDeclaration" ||
+						statement.type === "ExportDefaultDeclaration" ||
+						statement.type === "ExportNamedDeclaration" ||
+						statement.type === "ExportAllDeclaration"
+				);
+			if (isHarmony) {
+				const module = parser.state.module;
+				const compatDep = new HarmonyCompatibilityDependency();
+				compatDep.loc = {
+					start: {
+						line: -1,
+						column: 0
+					},
+					end: {
+						line: -1,
+						column: 0
+					},
+					index: -3
+				};
+				module.addPresentationalDependency(compatDep);
+				DynamicExports.bailout(parser.state);
+				HarmonyExports.enable(parser.state, isStrictHarmony);
+				parser.scope.isStrict = true;
+			}
+		});
+
+		parser.hooks.topLevelAwait.tap("HarmonyDetectionParserPlugin", () => {
+			const module = parser.state.module;
+			if (!this.topLevelAwait) {
+				throw new Error(
+					"The top-level-await experiment is not enabled (set experiments.topLevelAwait: true to enabled it)"
+				);
+			}
+			if (!HarmonyExports.isEnabled(parser.state)) {
+				throw new Error(
+					"Top-level-await is only supported in EcmaScript Modules"
+				);
+			}
+			/** @type {BuildMeta} */
+			(module.buildMeta).async = true;
+		});
+
+		/**
+		 * @returns {boolean | undefined} true if in harmony
+		 */
+		const skipInHarmony = () => {
+			if (HarmonyExports.isEnabled(parser.state)) {
+				return true;
+			}
+		};
+
+		/**
+		 * @returns {null | undefined} null if in harmony
+		 */
+		const nullInHarmony = () => {
+			if (HarmonyExports.isEnabled(parser.state)) {
+				return null;
+			}
+		};
+
+		const nonHarmonyIdentifiers = ["define", "exports"];
+		for (const identifier of nonHarmonyIdentifiers) {
+			parser.hooks.evaluateTypeof
+				.for(identifier)
+				.tap("HarmonyDetectionParserPlugin", nullInHarmony);
+			parser.hooks.typeof
+				.for(identifier)
+				.tap("HarmonyDetectionParserPlugin", skipInHarmony);
+			parser.hooks.evaluate
+				.for(identifier)
+				.tap("HarmonyDetectionParserPlugin", nullInHarmony);
+			parser.hooks.expression
+				.for(identifier)
+				.tap("HarmonyDetectionParserPlugin", skipInHarmony);
+			parser.hooks.call
+				.for(identifier)
+				.tap("HarmonyDetectionParserPlugin", skipInHarmony);
+		}
+	}
+};