1 files changed, 151 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/sharing/ShareRuntimeModule.js b/node_modules/webpack/lib/sharing/ShareRuntimeModule.js
new file mode 100644
index 00000000..0f63ef68
--- /dev/null
+++ b/node_modules/webpack/lib/sharing/ShareRuntimeModule.js
@@ -0,0 +1,151 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const RuntimeGlobals = require("../RuntimeGlobals");
+const RuntimeModule = require("../RuntimeModule");
+const Template = require("../Template");
+const {
+	compareModulesByIdentifier,
+	compareStrings
+} = require("../util/comparators");
+
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../ChunkGraph")} ChunkGraph */
+/** @typedef {import("../Compilation")} Compilation */
+
+class ShareRuntimeModule extends RuntimeModule {
+	constructor() {
+		super("sharing");
+	}
+
+	/**
+	 * @returns {string | null} runtime code
+	 */
+	generate() {
+		const compilation = /** @type {Compilation} */ (this.compilation);
+		const {
+			runtimeTemplate,
+			codeGenerationResults,
+			outputOptions: { uniqueName, ignoreBrowserWarnings }
+		} = compilation;
+		const chunkGraph = /** @type {ChunkGraph} */ (this.chunkGraph);
+		/** @type {Map<string, Map<number, Set<string>>>} */
+		const initCodePerScope = new Map();
+		for (const chunk of /** @type {Chunk} */ (
+			this.chunk
+		).getAllReferencedChunks()) {
+			const modules = chunkGraph.getOrderedChunkModulesIterableBySourceType(
+				chunk,
+				"share-init",
+				compareModulesByIdentifier
+			);
+			if (!modules) continue;
+			for (const m of modules) {
+				const data = codeGenerationResults.getData(
+					m,
+					chunk.runtime,
+					"share-init"
+				);
+				if (!data) continue;
+				for (const item of data) {
+					const { shareScope, initStage, init } = item;
+					let stages = initCodePerScope.get(shareScope);
+					if (stages === undefined) {
+						initCodePerScope.set(shareScope, (stages = new Map()));
+					}
+					let list = stages.get(initStage || 0);
+					if (list === undefined) {
+						stages.set(initStage || 0, (list = new Set()));
+					}
+					list.add(init);
+				}
+			}
+		}
+		return Template.asString([
+			`${RuntimeGlobals.shareScopeMap} = {};`,
+			"var initPromises = {};",
+			"var initTokens = {};",
+			`${RuntimeGlobals.initializeSharing} = ${runtimeTemplate.basicFunction(
+				"name, initScope",
+				[
+					"if(!initScope) initScope = [];",
+					"// handling circular init calls",
+					"var initToken = initTokens[name];",
+					"if(!initToken) initToken = initTokens[name] = {};",
+					"if(initScope.indexOf(initToken) >= 0) return;",
+					"initScope.push(initToken);",
+					"// only runs once",
+					"if(initPromises[name]) return initPromises[name];",
+					"// creates a new share scope if needed",
+					`if(!${RuntimeGlobals.hasOwnProperty}(${RuntimeGlobals.shareScopeMap}, name)) ${RuntimeGlobals.shareScopeMap}[name] = {};`,
+					"// runs all init snippets from all modules reachable",
+					`var scope = ${RuntimeGlobals.shareScopeMap}[name];`,
+					`var warn = ${
+						ignoreBrowserWarnings
+							? runtimeTemplate.basicFunction("", "")
+							: runtimeTemplate.basicFunction("msg", [
+									'if (typeof console !== "undefined" && console.warn) console.warn(msg);'
+								])
+					};`,
+					`var uniqueName = ${JSON.stringify(uniqueName || undefined)};`,
+					`var register = ${runtimeTemplate.basicFunction(
+						"name, version, factory, eager",
+						[
+							"var versions = scope[name] = scope[name] || {};",
+							"var activeVersion = versions[version];",
+							"if(!activeVersion || (!activeVersion.loaded && (!eager != !activeVersion.eager ? eager : uniqueName > activeVersion.from))) versions[version] = { get: factory, from: uniqueName, eager: !!eager };"
+						]
+					)};`,
+					`var initExternal = ${runtimeTemplate.basicFunction("id", [
+						`var handleError = ${runtimeTemplate.expressionFunction(
+							'warn("Initialization of sharing external failed: " + err)',
+							"err"
+						)};`,
+						"try {",
+						Template.indent([
+							`var module = ${RuntimeGlobals.require}(id);`,
+							"if(!module) return;",
+							`var initFn = ${runtimeTemplate.returningFunction(
+								`module && module.init && module.init(${RuntimeGlobals.shareScopeMap}[name], initScope)`,
+								"module"
+							)}`,
+							"if(module.then) return promises.push(module.then(initFn, handleError));",
+							"var initResult = initFn(module);",
+							"if(initResult && initResult.then) return promises.push(initResult['catch'](handleError));"
+						]),
+						"} catch(err) { handleError(err); }"
+					])}`,
+					"var promises = [];",
+					"switch(name) {",
+					...Array.from(initCodePerScope)
+						.sort(([a], [b]) => compareStrings(a, b))
+						.map(([name, stages]) =>
+							Template.indent([
+								`case ${JSON.stringify(name)}: {`,
+								Template.indent(
+									Array.from(stages)
+										.sort(([a], [b]) => a - b)
+										.map(([, initCode]) =>
+											Template.asString(Array.from(initCode))
+										)
+								),
+								"}",
+								"break;"
+							])
+						),
+					"}",
+					"if(!promises.length) return initPromises[name] = 1;",
+					`return initPromises[name] = Promise.all(promises).then(${runtimeTemplate.returningFunction(
+						"initPromises[name] = 1"
+					)});`
+				]
+			)};`
+		]);
+	}
+}
+
+module.exports = ShareRuntimeModule;