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app_vue/node_modules/webpack/lib/optimize/AggressiveSplittingPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { STAGE_ADVANCED } = require("../OptimizationStages");
+const { intersect } = require("../util/SetHelpers");
+const {
+	compareModulesByIdentifier,
+	compareChunks
+} = require("../util/comparators");
+const createSchemaValidation = require("../util/create-schema-validation");
+const identifierUtils = require("../util/identifier");
+
+/** @typedef {import("../../declarations/plugins/optimize/AggressiveSplittingPlugin").AggressiveSplittingPluginOptions} AggressiveSplittingPluginOptions */
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../ChunkGraph")} ChunkGraph */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Module")} Module */
+
+const validate = createSchemaValidation(
+	require("../../schemas/plugins/optimize/AggressiveSplittingPlugin.check.js"),
+	() =>
+		require("../../schemas/plugins/optimize/AggressiveSplittingPlugin.json"),
+	{
+		name: "Aggressive Splitting Plugin",
+		baseDataPath: "options"
+	}
+);
+
+/**
+ * @param {ChunkGraph} chunkGraph the chunk graph
+ * @param {Chunk} oldChunk the old chunk
+ * @param {Chunk} newChunk the new chunk
+ * @returns {(module: Module) => void} function to move module between chunks
+ */
+const moveModuleBetween = (chunkGraph, oldChunk, newChunk) => module => {
+	chunkGraph.disconnectChunkAndModule(oldChunk, module);
+	chunkGraph.connectChunkAndModule(newChunk, module);
+};
+
+/**
+ * @param {ChunkGraph} chunkGraph the chunk graph
+ * @param {Chunk} chunk the chunk
+ * @returns {(module: Module) => boolean} filter for entry module
+ */
+const isNotAEntryModule = (chunkGraph, chunk) => module =>
+	!chunkGraph.isEntryModuleInChunk(module, chunk);
+
+/** @type {WeakSet<Chunk>} */
+const recordedChunks = new WeakSet();
+
+const PLUGIN_NAME = "AggressiveSplittingPlugin";
+
+class AggressiveSplittingPlugin {
+	/**
+	 * @param {AggressiveSplittingPluginOptions=} options options object
+	 */
+	constructor(options = {}) {
+		validate(options);
+
+		this.options = options;
+		if (typeof this.options.minSize !== "number") {
+			this.options.minSize = 30 * 1024;
+		}
+		if (typeof this.options.maxSize !== "number") {
+			this.options.maxSize = 50 * 1024;
+		}
+		if (typeof this.options.chunkOverhead !== "number") {
+			this.options.chunkOverhead = 0;
+		}
+		if (typeof this.options.entryChunkMultiplicator !== "number") {
+			this.options.entryChunkMultiplicator = 1;
+		}
+	}
+
+	/**
+	 * @param {Chunk} chunk the chunk to test
+	 * @returns {boolean} true if the chunk was recorded
+	 */
+	static wasChunkRecorded(chunk) {
+		return recordedChunks.has(chunk);
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.thisCompilation.tap(PLUGIN_NAME, compilation => {
+			let needAdditionalSeal = false;
+			/** @typedef {{ id?: NonNullable<Chunk["id"]>, hash?: NonNullable<Chunk["hash"]>, modules: Module[], size: number }} SplitData */
+			/** @type {SplitData[]} */
+			let newSplits;
+			/** @type {Set<Chunk>} */
+			let fromAggressiveSplittingSet;
+			/** @type {Map<Chunk, SplitData>} */
+			let chunkSplitDataMap;
+			compilation.hooks.optimize.tap(PLUGIN_NAME, () => {
+				newSplits = [];
+				fromAggressiveSplittingSet = new Set();
+				chunkSplitDataMap = new Map();
+			});
+			compilation.hooks.optimizeChunks.tap(
+				{
+					name: PLUGIN_NAME,
+					stage: STAGE_ADVANCED
+				},
+				chunks => {
+					const chunkGraph = compilation.chunkGraph;
+					// Precompute stuff
+					const nameToModuleMap = new Map();
+					const moduleToNameMap = new Map();
+					const makePathsRelative =
+						identifierUtils.makePathsRelative.bindContextCache(
+							compiler.context,
+							compiler.root
+						);
+					for (const m of compilation.modules) {
+						const name = makePathsRelative(m.identifier());
+						nameToModuleMap.set(name, m);
+						moduleToNameMap.set(m, name);
+					}
+
+					// Check used chunk ids
+					const usedIds = new Set();
+					for (const chunk of chunks) {
+						usedIds.add(chunk.id);
+					}
+
+					const recordedSplits =
+						(compilation.records && compilation.records.aggressiveSplits) || [];
+					const usedSplits = newSplits
+						? recordedSplits.concat(newSplits)
+						: recordedSplits;
+
+					const minSize = /** @type {number} */ (this.options.minSize);
+					const maxSize = /** @type {number} */ (this.options.maxSize);
+
+					/**
+					 * @param {SplitData} splitData split data
+					 * @returns {boolean} true when applied, otherwise false
+					 */
+					const applySplit = splitData => {
+						// Cannot split if id is already taken
+						if (splitData.id !== undefined && usedIds.has(splitData.id)) {
+							return false;
+						}
+
+						// Get module objects from names
+						const selectedModules = splitData.modules.map(name =>
+							nameToModuleMap.get(name)
+						);
+
+						// Does the modules exist at all?
+						if (!selectedModules.every(Boolean)) return false;
+
+						// Check if size matches (faster than waiting for hash)
+						let size = 0;
+						for (const m of selectedModules) size += m.size();
+						if (size !== splitData.size) return false;
+
+						// get chunks with all modules
+						const selectedChunks = intersect(
+							selectedModules.map(
+								m => new Set(chunkGraph.getModuleChunksIterable(m))
+							)
+						);
+
+						// No relevant chunks found
+						if (selectedChunks.size === 0) return false;
+
+						// The found chunk is already the split or similar
+						if (
+							selectedChunks.size === 1 &&
+							chunkGraph.getNumberOfChunkModules(
+								Array.from(selectedChunks)[0]
+							) === selectedModules.length
+						) {
+							const chunk = Array.from(selectedChunks)[0];
+							if (fromAggressiveSplittingSet.has(chunk)) return false;
+							fromAggressiveSplittingSet.add(chunk);
+							chunkSplitDataMap.set(chunk, splitData);
+							return true;
+						}
+
+						// split the chunk into two parts
+						const newChunk = compilation.addChunk();
+						newChunk.chunkReason = "aggressive splitted";
+						for (const chunk of selectedChunks) {
+							for (const module of selectedModules) {
+								moveModuleBetween(chunkGraph, chunk, newChunk)(module);
+							}
+							chunk.split(newChunk);
+							chunk.name = null;
+						}
+						fromAggressiveSplittingSet.add(newChunk);
+						chunkSplitDataMap.set(newChunk, splitData);
+
+						if (splitData.id !== null && splitData.id !== undefined) {
+							newChunk.id = splitData.id;
+							newChunk.ids = [splitData.id];
+						}
+						return true;
+					};
+
+					// try to restore to recorded splitting
+					let changed = false;
+					for (let j = 0; j < usedSplits.length; j++) {
+						const splitData = usedSplits[j];
+						if (applySplit(splitData)) changed = true;
+					}
+
+					// for any chunk which isn't splitted yet, split it and create a new entry
+					// start with the biggest chunk
+					const cmpFn = compareChunks(chunkGraph);
+					const sortedChunks = Array.from(chunks).sort((a, b) => {
+						const diff1 =
+							chunkGraph.getChunkModulesSize(b) -
+							chunkGraph.getChunkModulesSize(a);
+						if (diff1) return diff1;
+						const diff2 =
+							chunkGraph.getNumberOfChunkModules(a) -
+							chunkGraph.getNumberOfChunkModules(b);
+						if (diff2) return diff2;
+						return cmpFn(a, b);
+					});
+					for (const chunk of sortedChunks) {
+						if (fromAggressiveSplittingSet.has(chunk)) continue;
+						const size = chunkGraph.getChunkModulesSize(chunk);
+						if (
+							size > maxSize &&
+							chunkGraph.getNumberOfChunkModules(chunk) > 1
+						) {
+							const modules = chunkGraph
+								.getOrderedChunkModules(chunk, compareModulesByIdentifier)
+								.filter(isNotAEntryModule(chunkGraph, chunk));
+							const selectedModules = [];
+							let selectedModulesSize = 0;
+							for (let k = 0; k < modules.length; k++) {
+								const module = modules[k];
+								const newSize = selectedModulesSize + module.size();
+								if (newSize > maxSize && selectedModulesSize >= minSize) {
+									break;
+								}
+								selectedModulesSize = newSize;
+								selectedModules.push(module);
+							}
+							if (selectedModules.length === 0) continue;
+							/** @type {SplitData} */
+							const splitData = {
+								modules: selectedModules
+									.map(m => moduleToNameMap.get(m))
+									.sort(),
+								size: selectedModulesSize
+							};
+
+							if (applySplit(splitData)) {
+								newSplits = (newSplits || []).concat(splitData);
+								changed = true;
+							}
+						}
+					}
+					if (changed) return true;
+				}
+			);
+			compilation.hooks.recordHash.tap(PLUGIN_NAME, records => {
+				// 4. save made splittings to records
+				const allSplits = new Set();
+				/** @type {Set<SplitData>} */
+				const invalidSplits = new Set();
+
+				// Check if some splittings are invalid
+				// We remove invalid splittings and try again
+				for (const chunk of compilation.chunks) {
+					const splitData = chunkSplitDataMap.get(chunk);
+					if (
+						splitData !== undefined &&
+						splitData.hash &&
+						chunk.hash !== splitData.hash
+					) {
+						// Split was successful, but hash doesn't equal
+						// We can throw away the split since it's useless now
+						invalidSplits.add(splitData);
+					}
+				}
+
+				if (invalidSplits.size > 0) {
+					records.aggressiveSplits =
+						/** @type {SplitData[]} */
+						(records.aggressiveSplits).filter(
+							splitData => !invalidSplits.has(splitData)
+						);
+					needAdditionalSeal = true;
+				} else {
+					// set hash and id values on all (new) splittings
+					for (const chunk of compilation.chunks) {
+						const splitData = chunkSplitDataMap.get(chunk);
+						if (splitData !== undefined) {
+							splitData.hash =
+								/** @type {NonNullable<Chunk["hash"]>} */
+								(chunk.hash);
+							splitData.id =
+								/** @type {NonNullable<Chunk["id"]>} */
+								(chunk.id);
+							allSplits.add(splitData);
+							// set flag for stats
+							recordedChunks.add(chunk);
+						}
+					}
+
+					// Also add all unused historical splits (after the used ones)
+					// They can still be used in some future compilation
+					const recordedSplits =
+						compilation.records && compilation.records.aggressiveSplits;
+					if (recordedSplits) {
+						for (const splitData of recordedSplits) {
+							if (!invalidSplits.has(splitData)) allSplits.add(splitData);
+						}
+					}
+
+					// record all splits
+					records.aggressiveSplits = Array.from(allSplits);
+
+					needAdditionalSeal = false;
+				}
+			});
+			compilation.hooks.needAdditionalSeal.tap(PLUGIN_NAME, () => {
+				if (needAdditionalSeal) {
+					needAdditionalSeal = false;
+					return true;
+				}
+			});
+		});
+	}
+}
+module.exports = AggressiveSplittingPlugin;