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node_modules/webpack/lib/esm/ModuleChunkFormatPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { ConcatSource } = require("webpack-sources");
+const { HotUpdateChunk, RuntimeGlobals } = require("..");
+const { JAVASCRIPT_TYPE } = require("../ModuleSourceTypeConstants");
+const Template = require("../Template");
+const {
+	createChunkHashHandler,
+	getChunkInfo
+} = require("../javascript/ChunkFormatHelpers");
+const { getAllChunks } = require("../javascript/ChunkHelpers");
+const {
+	chunkHasJs,
+	getChunkFilenameTemplate,
+	getCompilationHooks
+} = require("../javascript/JavascriptModulesPlugin");
+const { getUndoPath } = require("../util/identifier");
+
+/** @typedef {import("webpack-sources").Source} Source */
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../ChunkGraph")} ChunkGraph */
+/** @typedef {import("../Compilation")} Compilation */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Entrypoint")} Entrypoint */
+
+/**
+ * @param {Compilation} compilation the compilation instance
+ * @param {Chunk} chunk the chunk
+ * @param {Chunk} runtimeChunk the runtime chunk
+ * @returns {string} the relative path
+ */
+const getRelativePath = (compilation, chunk, runtimeChunk) => {
+	const currentOutputName = compilation
+		.getPath(
+			getChunkFilenameTemplate(runtimeChunk, compilation.outputOptions),
+			{
+				chunk: runtimeChunk,
+				contentHashType: "javascript"
+			}
+		)
+		.replace(/^\/+/g, "")
+		.split("/");
+	const baseOutputName = [...currentOutputName];
+	const chunkOutputName = compilation
+		.getPath(getChunkFilenameTemplate(chunk, compilation.outputOptions), {
+			chunk,
+			contentHashType: "javascript"
+		})
+		.replace(/^\/+/g, "")
+		.split("/");
+
+	// remove common parts except filename
+	while (
+		baseOutputName.length > 1 &&
+		chunkOutputName.length > 1 &&
+		baseOutputName[0] === chunkOutputName[0]
+	) {
+		baseOutputName.shift();
+		chunkOutputName.shift();
+	}
+	const last = chunkOutputName.join("/");
+	// create final path
+	return getUndoPath(baseOutputName.join("/"), last, true) + last;
+};
+
+/**
+ * @param {Compilation} compilation the compilation instance
+ * @param {Chunk} chunk the chunk to render the import for
+ * @param {string=} namedImport the named import to use for the import
+ * @param {Chunk=} runtimeChunk the runtime chunk
+ * @returns {string} the import source
+ */
+function renderChunkImport(compilation, chunk, namedImport, runtimeChunk) {
+	return `import ${namedImport ? `* as ${namedImport}` : `{ ${RuntimeGlobals.require} }`} from ${JSON.stringify(
+		getRelativePath(compilation, chunk, runtimeChunk || chunk)
+	)};\n`;
+}
+
+/**
+ * @param {number} index the index of the chunk
+ * @returns {string} the named import to use for the import
+ */
+function getChunkNamedImport(index) {
+	return `__webpack_chunk_${index}__`;
+}
+
+const PLUGIN_NAME = "ModuleChunkFormatPlugin";
+
+class ModuleChunkFormatPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.thisCompilation.tap(PLUGIN_NAME, (compilation) => {
+			compilation.hooks.additionalChunkRuntimeRequirements.tap(
+				PLUGIN_NAME,
+				(chunk, set) => {
+					if (chunk.hasRuntime()) return;
+					if (compilation.chunkGraph.getNumberOfEntryModules(chunk) > 0) {
+						set.add(RuntimeGlobals.require);
+						set.add(RuntimeGlobals.externalInstallChunk);
+					}
+				}
+			);
+			const hooks = getCompilationHooks(compilation);
+			/**
+			 * @param {Iterable<Chunk>} chunks the chunks to render
+			 * @param {ChunkGraph} chunkGraph the chunk graph
+			 * @param {Chunk=} runtimeChunk the runtime chunk
+			 * @returns {Source | undefined} the source
+			 */
+			const withDependentChunks = (chunks, chunkGraph, runtimeChunk) => {
+				if (/** @type {Set<Chunk>} */ (chunks).size > 0) {
+					const source = new ConcatSource();
+					let index = 0;
+
+					for (const chunk of chunks) {
+						index++;
+
+						if (!chunkHasJs(chunk, chunkGraph)) {
+							continue;
+						}
+						const namedImport = getChunkNamedImport(index);
+						source.add(
+							renderChunkImport(
+								compilation,
+								chunk,
+								namedImport,
+								runtimeChunk || chunk
+							)
+						);
+						source.add(
+							`${RuntimeGlobals.externalInstallChunk}(${namedImport});\n`
+						);
+					}
+					return source;
+				}
+			};
+			hooks.renderStartup.tap(
+				PLUGIN_NAME,
+				(modules, _lastModule, renderContext) => {
+					const { chunk, chunkGraph } = renderContext;
+					if (
+						chunkGraph.getNumberOfEntryModules(chunk) > 0 &&
+						chunk.hasRuntime()
+					) {
+						const entryDependentChunks =
+							chunkGraph.getChunkEntryDependentChunksIterable(chunk);
+						const sourceWithDependentChunks = withDependentChunks(
+							entryDependentChunks,
+							chunkGraph,
+							chunk
+						);
+						if (!sourceWithDependentChunks) {
+							return modules;
+						}
+						if (modules.size() === 0) {
+							return sourceWithDependentChunks;
+						}
+						const source = new ConcatSource();
+						source.add(sourceWithDependentChunks);
+						source.add("\n");
+						source.add(modules);
+						return source;
+					}
+					return modules;
+				}
+			);
+			hooks.renderChunk.tap(PLUGIN_NAME, (modules, renderContext) => {
+				const { chunk, chunkGraph, runtimeTemplate } = renderContext;
+				const hotUpdateChunk = chunk instanceof HotUpdateChunk ? chunk : null;
+				const source = new ConcatSource();
+				source.add(
+					`export const ${RuntimeGlobals.esmId} = ${JSON.stringify(chunk.id)};\n`
+				);
+				source.add(
+					`export const ${RuntimeGlobals.esmIds} = ${JSON.stringify(chunk.ids)};\n`
+				);
+				source.add(`export const ${RuntimeGlobals.esmModules} = `);
+				source.add(modules);
+				source.add(";\n");
+				const runtimeModules = chunkGraph.getChunkRuntimeModulesInOrder(chunk);
+				if (runtimeModules.length > 0) {
+					source.add(`export const ${RuntimeGlobals.esmRuntime} =\n`);
+					source.add(
+						Template.renderChunkRuntimeModules(runtimeModules, renderContext)
+					);
+				}
+				if (hotUpdateChunk) {
+					return source;
+				}
+				const { entries, runtimeChunk } = getChunkInfo(chunk, chunkGraph);
+				if (runtimeChunk) {
+					const entrySource = new ConcatSource();
+					entrySource.add(source);
+					entrySource.add(";\n\n// load runtime\n");
+					entrySource.add(
+						renderChunkImport(compilation, runtimeChunk, "", chunk)
+					);
+					const startupSource = new ConcatSource();
+					startupSource.add(
+						`var __webpack_exec__ = ${runtimeTemplate.returningFunction(
+							`${RuntimeGlobals.require}(${RuntimeGlobals.entryModuleId} = moduleId)`,
+							"moduleId"
+						)}\n`
+					);
+
+					/** @type {Set<Chunk>} */
+					const loadedChunks = new Set();
+					for (let i = 0; i < entries.length; i++) {
+						const [module, entrypoint] = entries[i];
+						if (!chunkGraph.getModuleSourceTypes(module).has(JAVASCRIPT_TYPE)) {
+							continue;
+						}
+						const final = i + 1 === entries.length;
+						const moduleId = chunkGraph.getModuleId(module);
+						const chunks = getAllChunks(
+							/** @type {Entrypoint} */ (entrypoint),
+							/** @type {Chunk} */ (runtimeChunk),
+							undefined
+						);
+						/** @type {Set<Chunk>} */
+						const processChunks = new Set();
+						for (const chunk of chunks) {
+							if (loadedChunks.has(chunk)) {
+								continue;
+							}
+							loadedChunks.add(chunk);
+							processChunks.add(chunk);
+						}
+						const sourceWithDependentChunks = withDependentChunks(
+							processChunks,
+							chunkGraph,
+							chunk
+						);
+						if (sourceWithDependentChunks) {
+							startupSource.add("\n");
+							startupSource.add(sourceWithDependentChunks);
+						}
+						startupSource.add(
+							`${
+								final ? `var ${RuntimeGlobals.exports} = ` : ""
+							}__webpack_exec__(${JSON.stringify(moduleId)});\n`
+						);
+					}
+
+					entrySource.add(
+						hooks.renderStartup.call(
+							startupSource,
+							entries[entries.length - 1][0],
+							{
+								...renderContext,
+								inlined: false
+							}
+						)
+					);
+					return entrySource;
+				}
+				return source;
+			});
+			hooks.chunkHash.tap(PLUGIN_NAME, createChunkHashHandler(PLUGIN_NAME));
+		});
+	}
+}
+
+module.exports = ModuleChunkFormatPlugin;