FM / optimize

/var/www/flurhymez/node_modules/webpack/lib/optimize/

/var/www/flurhymez/node_modules/webpack/lib/optimize

Name	Size	Mode	Actions
AggressiveMergingPlugin.js	2300	0644	edit dl rm
AggressiveSplittingPlugin.js	10151	0644	edit dl rm
ConcatenatedModule.js	54482	0644	edit dl rm
EnsureChunkConditionsPlugin.js	2536	0644	edit dl rm
FlagIncludedChunksPlugin.js	3782	0644	edit dl rm
InnerGraph.js	9218	0644	edit dl rm
InnerGraphPlugin.js	12046	0644	edit dl rm
LimitChunkCountPlugin.js	8392	0644	edit dl rm
MangleExportsPlugin.js	5149	0644	edit dl rm
MergeDuplicateChunksPlugin.js	3600	0644	edit dl rm
MinChunkSizePlugin.js	3335	0644	edit dl rm
MinMaxSizeWarning.js	819	0644	edit dl rm
ModuleConcatenationPlugin.js	26652	0644	edit dl rm
RealContentHashPlugin.js	12276	0644	edit dl rm
RemoveEmptyChunksPlugin.js	1337	0644	edit dl rm
RemoveParentModulesPlugin.js	3798	0644	edit dl rm
RuntimeChunkPlugin.js	1041	0644	edit dl rm
SideEffectsFlagPlugin.js	10302	0644	edit dl rm
SplitChunksPlugin.js	54598	0644	edit dl rm

Edit: /var/www/flurhymez/node_modules/webpack/lib/optimize/LimitChunkCountPlugin.js (8392B)

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const { STAGE_ADVANCED } = require("../OptimizationStages");
const LazyBucketSortedSet = require("../util/LazyBucketSortedSet");
const { compareChunks } = require("../util/comparators");
const createSchemaValidation = require("../util/create-schema-validation");

/** @typedef {import("../../declarations/plugins/optimize/LimitChunkCountPlugin").LimitChunkCountPluginOptions} LimitChunkCountPluginOptions */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Compiler")} Compiler */

const validate = createSchemaValidation(
	require("../../schemas/plugins/optimize/LimitChunkCountPlugin.check.js"),
	() => require("../../schemas/plugins/optimize/LimitChunkCountPlugin.json"),
	{
		name: "Limit Chunk Count Plugin",
		baseDataPath: "options"
	}
);

/**
 * @typedef {Object} ChunkCombination
 * @property {boolean} deleted this is set to true when combination was removed
 * @property {number} sizeDiff
 * @property {number} integratedSize
 * @property {Chunk} a
 * @property {Chunk} b
 * @property {number} aIdx
 * @property {number} bIdx
 * @property {number} aSize
 * @property {number} bSize
 */

const addToSetMap = (map, key, value) => {
	const set = map.get(key);
	if (set === undefined) {
		map.set(key, new Set([value]));
	} else {
		set.add(value);
	}
};

class LimitChunkCountPlugin {
	/**
	 * @param {LimitChunkCountPluginOptions=} options options object
	 */
	constructor(options) {
		validate(options);
		this.options = options;
	}

/**
	 * @param {Compiler} compiler the webpack compiler
	 * @returns {void}
	 */
	apply(compiler) {
		const options = this.options;
		compiler.hooks.compilation.tap("LimitChunkCountPlugin", compilation => {
			compilation.hooks.optimizeChunks.tap(
				{
					name: "LimitChunkCountPlugin",
					stage: STAGE_ADVANCED
				},
				chunks => {
					const chunkGraph = compilation.chunkGraph;
					const maxChunks = options.maxChunks;
					if (!maxChunks) return;
					if (maxChunks < 1) return;
					if (compilation.chunks.size <= maxChunks) return;

let remainingChunksToMerge = compilation.chunks.size - maxChunks;

// order chunks in a deterministic way
					const compareChunksWithGraph = compareChunks(chunkGraph);
					const orderedChunks = Array.from(chunks).sort(compareChunksWithGraph);

// create a lazy sorted data structure to keep all combinations
					// this is large. Size = chunks * (chunks - 1) / 2
					// It uses a multi layer bucket sort plus normal sort in the last layer
					// It's also lazy so only accessed buckets are sorted
					const combinations = new LazyBucketSortedSet(
						// Layer 1: ordered by largest size benefit
						c => c.sizeDiff,
						(a, b) => b - a,
						// Layer 2: ordered by smallest combined size
						c => c.integratedSize,
						(a, b) => a - b,
						// Layer 3: ordered by position difference in orderedChunk (-> to be deterministic)
						c => c.bIdx - c.aIdx,
						(a, b) => a - b,
						// Layer 4: ordered by position in orderedChunk (-> to be deterministic)
						(a, b) => a.bIdx - b.bIdx
					);

// we keep a mapping from chunk to all combinations
					// but this mapping is not kept up-to-date with deletions
					// so `deleted` flag need to be considered when iterating this
					/** @type {Map<Chunk, Set<ChunkCombination>>} */
					const combinationsByChunk = new Map();

orderedChunks.forEach((b, bIdx) => {
						// create combination pairs with size and integrated size
						for (let aIdx = 0; aIdx < bIdx; aIdx++) {
							const a = orderedChunks[aIdx];
							// filter pairs that can not be integrated!
							if (!chunkGraph.canChunksBeIntegrated(a, b)) continue;

const integratedSize = chunkGraph.getIntegratedChunksSize(
								a,
								b,
								options
							);

const aSize = chunkGraph.getChunkSize(a, options);
							const bSize = chunkGraph.getChunkSize(b, options);
							const c = {
								deleted: false,
								sizeDiff: aSize + bSize - integratedSize,
								integratedSize,
								a,
								b,
								aIdx,
								bIdx,
								aSize,
								bSize
							};
							combinations.add(c);
							addToSetMap(combinationsByChunk, a, c);
							addToSetMap(combinationsByChunk, b, c);
						}
						return combinations;
					});

// list of modified chunks during this run
					// combinations affected by this change are skipped to allow
					// further optimizations
					/** @type {Set<Chunk>} */
					const modifiedChunks = new Set();

let changed = false;
					// eslint-disable-next-line no-constant-condition
					loop: while (true) {
						const combination = combinations.popFirst();
						if (combination === undefined) break;

combination.deleted = true;
						const { a, b, integratedSize } = combination;

// skip over pair when
						// one of the already merged chunks is a parent of one of the chunks
						if (modifiedChunks.size > 0) {
							const queue = new Set(a.groupsIterable);
							for (const group of b.groupsIterable) {
								queue.add(group);
							}
							for (const group of queue) {
								for (const mChunk of modifiedChunks) {
									if (mChunk !== a && mChunk !== b && mChunk.isInGroup(group)) {
										// This is a potential pair which needs recalculation
										// We can't do that now, but it merge before following pairs
										// so we leave space for it, and consider chunks as modified
										// just for the worse case
										remainingChunksToMerge--;
										if (remainingChunksToMerge <= 0) break loop;
										modifiedChunks.add(a);
										modifiedChunks.add(b);
										continue loop;
									}
								}
								for (const parent of group.parentsIterable) {
									queue.add(parent);
								}
							}
						}

// merge the chunks
						if (chunkGraph.canChunksBeIntegrated(a, b)) {
							chunkGraph.integrateChunks(a, b);
							compilation.chunks.delete(b);

// flag chunk a as modified as further optimization are possible for all children here
							modifiedChunks.add(a);

changed = true;
							remainingChunksToMerge--;
							if (remainingChunksToMerge <= 0) break;

// Update all affected combinations
							// delete all combination with the removed chunk
							// we will use combinations with the kept chunk instead
							for (const combination of combinationsByChunk.get(a)) {
								if (combination.deleted) continue;
								combination.deleted = true;
								combinations.delete(combination);
							}

// Update combinations with the kept chunk with new sizes
							for (const combination of combinationsByChunk.get(b)) {
								if (combination.deleted) continue;
								if (combination.a === b) {
									if (!chunkGraph.canChunksBeIntegrated(a, combination.b)) {
										combination.deleted = true;
										combinations.delete(combination);
										continue;
									}
									// Update size
									const newIntegratedSize = chunkGraph.getIntegratedChunksSize(
										a,
										combination.b,
										options
									);
									const finishUpdate = combinations.startUpdate(combination);
									combination.a = a;
									combination.integratedSize = newIntegratedSize;
									combination.aSize = integratedSize;
									combination.sizeDiff =
										combination.bSize + integratedSize - newIntegratedSize;
									finishUpdate();
								} else if (combination.b === b) {
									if (!chunkGraph.canChunksBeIntegrated(combination.a, a)) {
										combination.deleted = true;
										combinations.delete(combination);
										continue;
									}
									// Update size
									const newIntegratedSize = chunkGraph.getIntegratedChunksSize(
										combination.a,
										a,
										options
									);

const finishUpdate = combinations.startUpdate(combination);
									combination.b = a;
									combination.integratedSize = newIntegratedSize;
									combination.bSize = integratedSize;
									combination.sizeDiff =
										integratedSize + combination.aSize - newIntegratedSize;
									finishUpdate();
								}
							}
							combinationsByChunk.set(a, combinationsByChunk.get(b));
							combinationsByChunk.delete(b);
						}
					}
					if (changed) return true;
				}
			);
		});
	}
}
module.exports = LimitChunkCountPlugin;

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