Updated the files.

my-app/node_modules/webpack/lib/optimize/AggressiveMergingPlugin.js

@@ -0,0 +1,100 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { STAGE_ADVANCED } = require("../OptimizationStages");
+
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../Compiler")} Compiler */
+
+/**
+ * @typedef {Object} AggressiveMergingPluginOptions
+ * @property {number=} minSizeReduce minimal size reduction to trigger merging
+ */
+
+class AggressiveMergingPlugin {
+	/**
+	 * @param {AggressiveMergingPluginOptions=} [options] options object
+	 */
+	constructor(options) {
+		if (
+			(options !== undefined && typeof options !== "object") ||
+			Array.isArray(options)
+		) {
+			throw new Error(
+				"Argument should be an options object. To use defaults, pass in nothing.\nFor more info on options, see https://webpack.js.org/plugins/"
+			);
+		}
+		this.options = options || {};
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		const options = this.options;
+		const minSizeReduce = options.minSizeReduce || 1.5;
+
+		compiler.hooks.thisCompilation.tap(
+			"AggressiveMergingPlugin",
+			compilation => {
+				compilation.hooks.optimizeChunks.tap(
+					{
+						name: "AggressiveMergingPlugin",
+						stage: STAGE_ADVANCED
+					},
+					chunks => {
+						const chunkGraph = compilation.chunkGraph;
+						/** @type {{a: Chunk, b: Chunk, improvement: number}[]} */
+						let combinations = [];
+						for (const a of chunks) {
+							if (a.canBeInitial()) continue;
+							for (const b of chunks) {
+								if (b.canBeInitial()) continue;
+								if (b === a) break;
+								if (!chunkGraph.canChunksBeIntegrated(a, b)) {
+									continue;
+								}
+								const aSize = chunkGraph.getChunkSize(b, {
+									chunkOverhead: 0
+								});
+								const bSize = chunkGraph.getChunkSize(a, {
+									chunkOverhead: 0
+								});
+								const abSize = chunkGraph.getIntegratedChunksSize(b, a, {
+									chunkOverhead: 0
+								});
+								const improvement = (aSize + bSize) / abSize;
+								combinations.push({
+									a,
+									b,
+									improvement
+								});
+							}
+						}
+
+						combinations.sort((a, b) => {
+							return b.improvement - a.improvement;
+						});
+
+						const pair = combinations[0];
+
+						if (!pair) return;
+						if (pair.improvement < minSizeReduce) return;
+
+						chunkGraph.integrateChunks(pair.b, pair.a);
+						compilation.chunks.delete(pair.a);
+						return true;
+					}
+				);
+			}
+		);
+	}
+}
+
+module.exports = AggressiveMergingPlugin;

my-app/node_modules/webpack/lib/optimize/AggressiveSplittingPlugin.js

@@ -0,0 +1,336 @@
+/*
+	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) => {
+	return module => {
+		chunkGraph.disconnectChunkAndModule(oldChunk, module);
+		chunkGraph.connectChunkAndModule(newChunk, module);
+	};
+};
+
+/**
+ * @param {ChunkGraph} chunkGraph the chunk graph
+ * @param {Chunk} chunk the chunk
+ * @returns {function(Module): boolean} filter for entry module
+ */
+const isNotAEntryModule = (chunkGraph, chunk) => {
+	return module => {
+		return !chunkGraph.isEntryModuleInChunk(module, chunk);
+	};
+};
+
+/** @type {WeakSet<Chunk>} */
+const recordedChunks = new WeakSet();
+
+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(
+			"AggressiveSplittingPlugin",
+			compilation => {
+				let needAdditionalSeal = false;
+				let newSplits;
+				/** @type {Set<Chunk>} */
+				let fromAggressiveSplittingSet;
+				let chunkSplitDataMap;
+				compilation.hooks.optimize.tap("AggressiveSplittingPlugin", () => {
+					newSplits = [];
+					fromAggressiveSplittingSet = new Set();
+					chunkSplitDataMap = new Map();
+				});
+				compilation.hooks.optimizeChunks.tap(
+					{
+						name: "AggressiveSplittingPlugin",
+						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);
+
+						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) {
+								selectedModules.forEach(
+									moveModuleBetween(chunkGraph, chunk, newChunk)
+								);
+								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;
+								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(
+					"AggressiveSplittingPlugin",
+					records => {
+						// 4. save made splittings to records
+						const allSplits = new Set();
+						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) {
+								if (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 = 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 = chunk.hash;
+									splitData.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(
+					"AggressiveSplittingPlugin",
+					() => {
+						if (needAdditionalSeal) {
+							needAdditionalSeal = false;
+							return true;
+						}
+					}
+				);
+			}
+		);
+	}
+}
+module.exports = AggressiveSplittingPlugin;

my-app/node_modules/webpack/lib/optimize/EnsureChunkConditionsPlugin.js

@@ -0,0 +1,88 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { STAGE_BASIC } = require("../OptimizationStages");
+
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../ChunkGroup")} ChunkGroup */
+/** @typedef {import("../Compiler")} Compiler */
+
+class EnsureChunkConditionsPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			"EnsureChunkConditionsPlugin",
+			compilation => {
+				/**
+				 * @param {Iterable<Chunk>} chunks the chunks
+				 */
+				const handler = chunks => {
+					const chunkGraph = compilation.chunkGraph;
+					// These sets are hoisted here to save memory
+					// They are cleared at the end of every loop
+					/** @type {Set<Chunk>} */
+					const sourceChunks = new Set();
+					/** @type {Set<ChunkGroup>} */
+					const chunkGroups = new Set();
+					for (const module of compilation.modules) {
+						if (!module.hasChunkCondition()) continue;
+						for (const chunk of chunkGraph.getModuleChunksIterable(module)) {
+							if (!module.chunkCondition(chunk, compilation)) {
+								sourceChunks.add(chunk);
+								for (const group of chunk.groupsIterable) {
+									chunkGroups.add(group);
+								}
+							}
+						}
+						if (sourceChunks.size === 0) continue;
+						/** @type {Set<Chunk>} */
+						const targetChunks = new Set();
+						chunkGroupLoop: for (const chunkGroup of chunkGroups) {
+							// Can module be placed in a chunk of this group?
+							for (const chunk of chunkGroup.chunks) {
+								if (module.chunkCondition(chunk, compilation)) {
+									targetChunks.add(chunk);
+									continue chunkGroupLoop;
+								}
+							}
+							// We reached the entrypoint: fail
+							if (chunkGroup.isInitial()) {
+								throw new Error(
+									"Cannot fullfil chunk condition of " + module.identifier()
+								);
+							}
+							// Try placing in all parents
+							for (const group of chunkGroup.parentsIterable) {
+								chunkGroups.add(group);
+							}
+						}
+						for (const sourceChunk of sourceChunks) {
+							chunkGraph.disconnectChunkAndModule(sourceChunk, module);
+						}
+						for (const targetChunk of targetChunks) {
+							chunkGraph.connectChunkAndModule(targetChunk, module);
+						}
+						sourceChunks.clear();
+						chunkGroups.clear();
+					}
+				};
+				compilation.hooks.optimizeChunks.tap(
+					{
+						name: "EnsureChunkConditionsPlugin",
+						stage: STAGE_BASIC
+					},
+					handler
+				);
+			}
+		);
+	}
+}
+module.exports = EnsureChunkConditionsPlugin;

my-app/node_modules/webpack/lib/optimize/FlagIncludedChunksPlugin.js

@@ -0,0 +1,124 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../Chunk").ChunkId} ChunkId */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Module")} Module */
+
+class FlagIncludedChunksPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap("FlagIncludedChunksPlugin", compilation => {
+			compilation.hooks.optimizeChunkIds.tap(
+				"FlagIncludedChunksPlugin",
+				chunks => {
+					const chunkGraph = compilation.chunkGraph;
+
+					// prepare two bit integers for each module
+					// 2^31 is the max number represented as SMI in v8
+					// we want the bits distributed this way:
+					// the bit 2^31 is pretty rar and only one module should get it
+					// so it has a probability of 1 / modulesCount
+					// the first bit (2^0) is the easiest and every module could get it
+					// if it doesn't get a better bit
+					// from bit 2^n to 2^(n+1) there is a probability of p
+					// so 1 / modulesCount == p^31
+					// <=> p = sqrt31(1 / modulesCount)
+					// so we use a modulo of 1 / sqrt31(1 / modulesCount)
+					/** @type {WeakMap<Module, number>} */
+					const moduleBits = new WeakMap();
+					const modulesCount = compilation.modules.size;
+
+					// precalculate the modulo values for each bit
+					const modulo = 1 / Math.pow(1 / modulesCount, 1 / 31);
+					const modulos = Array.from(
+						{ length: 31 },
+						(x, i) => Math.pow(modulo, i) | 0
+					);
+
+					// iterate all modules to generate bit values
+					let i = 0;
+					for (const module of compilation.modules) {
+						let bit = 30;
+						while (i % modulos[bit] !== 0) {
+							bit--;
+						}
+						moduleBits.set(module, 1 << bit);
+						i++;
+					}
+
+					// iterate all chunks to generate bitmaps
+					/** @type {WeakMap<Chunk, number>} */
+					const chunkModulesHash = new WeakMap();
+					for (const chunk of chunks) {
+						let hash = 0;
+						for (const module of chunkGraph.getChunkModulesIterable(chunk)) {
+							hash |= /** @type {number} */ (moduleBits.get(module));
+						}
+						chunkModulesHash.set(chunk, hash);
+					}
+
+					for (const chunkA of chunks) {
+						const chunkAHash =
+							/** @type {number} */
+							(chunkModulesHash.get(chunkA));
+						const chunkAModulesCount =
+							chunkGraph.getNumberOfChunkModules(chunkA);
+						if (chunkAModulesCount === 0) continue;
+						let bestModule = undefined;
+						for (const module of chunkGraph.getChunkModulesIterable(chunkA)) {
+							if (
+								bestModule === undefined ||
+								chunkGraph.getNumberOfModuleChunks(bestModule) >
+									chunkGraph.getNumberOfModuleChunks(module)
+							)
+								bestModule = module;
+						}
+						loopB: for (const chunkB of chunkGraph.getModuleChunksIterable(
+							/** @type {Module} */ (bestModule)
+						)) {
+							// as we iterate the same iterables twice
+							// skip if we find ourselves
+							if (chunkA === chunkB) continue;
+
+							const chunkBModulesCount =
+								chunkGraph.getNumberOfChunkModules(chunkB);
+
+							// ids for empty chunks are not included
+							if (chunkBModulesCount === 0) continue;
+
+							// instead of swapping A and B just bail
+							// as we loop twice the current A will be B and B then A
+							if (chunkAModulesCount > chunkBModulesCount) continue;
+
+							// is chunkA in chunkB?
+
+							// we do a cheap check for the hash value
+							const chunkBHash =
+								/** @type {number} */
+								(chunkModulesHash.get(chunkB));
+							if ((chunkBHash & chunkAHash) !== chunkAHash) continue;
+
+							// compare all modules
+							for (const m of chunkGraph.getChunkModulesIterable(chunkA)) {
+								if (!chunkGraph.isModuleInChunk(m, chunkB)) continue loopB;
+							}
+							/** @type {ChunkId[]} */
+							(chunkB.ids).push(/** @type {ChunkId} */ (chunkA.id));
+						}
+					}
+				}
+			);
+		});
+	}
+}
+module.exports = FlagIncludedChunksPlugin;

my-app/node_modules/webpack/lib/optimize/InnerGraph.js

@@ -0,0 +1,346 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Sergey Melyukov @smelukov
+*/
+
+"use strict";
+
+const { UsageState } = require("../ExportsInfo");
+
+/** @typedef {import("estree").Node} AnyNode */
+/** @typedef {import("../Dependency")} Dependency */
+/** @typedef {import("../ModuleGraph")} ModuleGraph */
+/** @typedef {import("../ModuleGraphConnection")} ModuleGraphConnection */
+/** @typedef {import("../ModuleGraphConnection").ConnectionState} ConnectionState */
+/** @typedef {import("../Parser").ParserState} ParserState */
+/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
+/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
+
+/** @typedef {Map<TopLevelSymbol | null, Set<string | TopLevelSymbol> | true | undefined>} InnerGraph */
+/** @typedef {function(boolean | Set<string> | undefined): void} UsageCallback */
+
+/**
+ * @typedef {Object} StateObject
+ * @property {InnerGraph} innerGraph
+ * @property {TopLevelSymbol=} currentTopLevelSymbol
+ * @property {Map<TopLevelSymbol, Set<UsageCallback>>} usageCallbackMap
+ */
+
+/** @typedef {false|StateObject} State */
+
+/** @type {WeakMap<ParserState, State>} */
+const parserStateMap = new WeakMap();
+const topLevelSymbolTag = Symbol("top level symbol");
+
+/**
+ * @param {ParserState} parserState parser state
+ * @returns {State | undefined} state
+ */
+function getState(parserState) {
+	return parserStateMap.get(parserState);
+}
+
+/**
+ * @param {ParserState} parserState parser state
+ * @returns {void}
+ */
+exports.bailout = parserState => {
+	parserStateMap.set(parserState, false);
+};
+
+/**
+ * @param {ParserState} parserState parser state
+ * @returns {void}
+ */
+exports.enable = parserState => {
+	const state = parserStateMap.get(parserState);
+	if (state === false) {
+		return;
+	}
+	parserStateMap.set(parserState, {
+		innerGraph: new Map(),
+		currentTopLevelSymbol: undefined,
+		usageCallbackMap: new Map()
+	});
+};
+
+/**
+ * @param {ParserState} parserState parser state
+ * @returns {boolean} true, when enabled
+ */
+exports.isEnabled = parserState => {
+	const state = parserStateMap.get(parserState);
+	return !!state;
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @param {TopLevelSymbol | null} symbol the symbol, or null for all symbols
+ * @param {string | TopLevelSymbol | true} usage usage data
+ * @returns {void}
+ */
+exports.addUsage = (state, symbol, usage) => {
+	const innerGraphState = getState(state);
+
+	if (innerGraphState) {
+		const { innerGraph } = innerGraphState;
+		const info = innerGraph.get(symbol);
+		if (usage === true) {
+			innerGraph.set(symbol, true);
+		} else if (info === undefined) {
+			innerGraph.set(symbol, new Set([usage]));
+		} else if (info !== true) {
+			info.add(usage);
+		}
+	}
+};
+
+/**
+ * @param {JavascriptParser} parser the parser
+ * @param {string} name name of variable
+ * @param {string | TopLevelSymbol | true} usage usage data
+ * @returns {void}
+ */
+exports.addVariableUsage = (parser, name, usage) => {
+	const symbol =
+		/** @type {TopLevelSymbol} */ (
+			parser.getTagData(name, topLevelSymbolTag)
+		) || exports.tagTopLevelSymbol(parser, name);
+	if (symbol) {
+		exports.addUsage(parser.state, symbol, usage);
+	}
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @returns {void}
+ */
+exports.inferDependencyUsage = state => {
+	const innerGraphState = getState(state);
+
+	if (!innerGraphState) {
+		return;
+	}
+
+	const { innerGraph, usageCallbackMap } = innerGraphState;
+	const processed = new Map();
+	// flatten graph to terminal nodes (string, undefined or true)
+	const nonTerminal = new Set(innerGraph.keys());
+	while (nonTerminal.size > 0) {
+		for (const key of nonTerminal) {
+			/** @type {Set<string|TopLevelSymbol> | true} */
+			let newSet = new Set();
+			let isTerminal = true;
+			const value = innerGraph.get(key);
+			let alreadyProcessed = processed.get(key);
+			if (alreadyProcessed === undefined) {
+				alreadyProcessed = new Set();
+				processed.set(key, alreadyProcessed);
+			}
+			if (value !== true && value !== undefined) {
+				for (const item of value) {
+					alreadyProcessed.add(item);
+				}
+				for (const item of value) {
+					if (typeof item === "string") {
+						newSet.add(item);
+					} else {
+						const itemValue = innerGraph.get(item);
+						if (itemValue === true) {
+							newSet = true;
+							break;
+						}
+						if (itemValue !== undefined) {
+							for (const i of itemValue) {
+								if (i === key) continue;
+								if (alreadyProcessed.has(i)) continue;
+								newSet.add(i);
+								if (typeof i !== "string") {
+									isTerminal = false;
+								}
+							}
+						}
+					}
+				}
+				if (newSet === true) {
+					innerGraph.set(key, true);
+				} else if (newSet.size === 0) {
+					innerGraph.set(key, undefined);
+				} else {
+					innerGraph.set(key, newSet);
+				}
+			}
+			if (isTerminal) {
+				nonTerminal.delete(key);
+
+				// For the global key, merge with all other keys
+				if (key === null) {
+					const globalValue = innerGraph.get(null);
+					if (globalValue) {
+						for (const [key, value] of innerGraph) {
+							if (key !== null && value !== true) {
+								if (globalValue === true) {
+									innerGraph.set(key, true);
+								} else {
+									const newSet = new Set(value);
+									for (const item of globalValue) {
+										newSet.add(item);
+									}
+									innerGraph.set(key, newSet);
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
+	/** @type {Map<Dependency, true | Set<string>>} */
+	for (const [symbol, callbacks] of usageCallbackMap) {
+		const usage = /** @type {true | Set<string> | undefined} */ (
+			innerGraph.get(symbol)
+		);
+		for (const callback of callbacks) {
+			callback(usage === undefined ? false : usage);
+		}
+	}
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @param {UsageCallback} onUsageCallback on usage callback
+ */
+exports.onUsage = (state, onUsageCallback) => {
+	const innerGraphState = getState(state);
+
+	if (innerGraphState) {
+		const { usageCallbackMap, currentTopLevelSymbol } = innerGraphState;
+		if (currentTopLevelSymbol) {
+			let callbacks = usageCallbackMap.get(currentTopLevelSymbol);
+
+			if (callbacks === undefined) {
+				callbacks = new Set();
+				usageCallbackMap.set(currentTopLevelSymbol, callbacks);
+			}
+
+			callbacks.add(onUsageCallback);
+		} else {
+			onUsageCallback(true);
+		}
+	} else {
+		onUsageCallback(undefined);
+	}
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @param {TopLevelSymbol | undefined} symbol the symbol
+ */
+exports.setTopLevelSymbol = (state, symbol) => {
+	const innerGraphState = getState(state);
+
+	if (innerGraphState) {
+		innerGraphState.currentTopLevelSymbol = symbol;
+	}
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @returns {TopLevelSymbol|void} usage data
+ */
+exports.getTopLevelSymbol = state => {
+	const innerGraphState = getState(state);
+
+	if (innerGraphState) {
+		return innerGraphState.currentTopLevelSymbol;
+	}
+};
+
+/**
+ * @param {JavascriptParser} parser parser
+ * @param {string} name name of variable
+ * @returns {TopLevelSymbol | undefined} symbol
+ */
+exports.tagTopLevelSymbol = (parser, name) => {
+	const innerGraphState = getState(parser.state);
+	if (!innerGraphState) return;
+
+	parser.defineVariable(name);
+
+	const existingTag = /** @type {TopLevelSymbol} */ (
+		parser.getTagData(name, topLevelSymbolTag)
+	);
+	if (existingTag) {
+		return existingTag;
+	}
+
+	const fn = new TopLevelSymbol(name);
+	parser.tagVariable(name, topLevelSymbolTag, fn);
+	return fn;
+};
+
+/**
+ * @param {Dependency} dependency the dependency
+ * @param {Set<string> | boolean} usedByExports usedByExports info
+ * @param {ModuleGraph} moduleGraph moduleGraph
+ * @param {RuntimeSpec} runtime runtime
+ * @returns {boolean} false, when unused. Otherwise true
+ */
+exports.isDependencyUsedByExports = (
+	dependency,
+	usedByExports,
+	moduleGraph,
+	runtime
+) => {
+	if (usedByExports === false) return false;
+	if (usedByExports !== true && usedByExports !== undefined) {
+		const selfModule = moduleGraph.getParentModule(dependency);
+		const exportsInfo = moduleGraph.getExportsInfo(selfModule);
+		let used = false;
+		for (const exportName of usedByExports) {
+			if (exportsInfo.getUsed(exportName, runtime) !== UsageState.Unused)
+				used = true;
+		}
+		if (!used) return false;
+	}
+	return true;
+};
+
+/**
+ * @param {Dependency} dependency the dependency
+ * @param {Set<string> | boolean | undefined} usedByExports usedByExports info
+ * @param {ModuleGraph} moduleGraph moduleGraph
+ * @returns {null | false | function(ModuleGraphConnection, RuntimeSpec): ConnectionState} function to determine if the connection is active
+ */
+exports.getDependencyUsedByExportsCondition = (
+	dependency,
+	usedByExports,
+	moduleGraph
+) => {
+	if (usedByExports === false) return false;
+	if (usedByExports !== true && usedByExports !== undefined) {
+		const selfModule = moduleGraph.getParentModule(dependency);
+		const exportsInfo = moduleGraph.getExportsInfo(selfModule);
+		return (connections, runtime) => {
+			for (const exportName of usedByExports) {
+				if (exportsInfo.getUsed(exportName, runtime) !== UsageState.Unused)
+					return true;
+			}
+			return false;
+		};
+	}
+	return null;
+};
+
+class TopLevelSymbol {
+	/**
+	 * @param {string} name name of the variable
+	 */
+	constructor(name) {
+		this.name = name;
+	}
+}
+
+exports.TopLevelSymbol = TopLevelSymbol;
+exports.topLevelSymbolTag = topLevelSymbolTag;

my-app/node_modules/webpack/lib/optimize/InnerGraphPlugin.js

@@ -0,0 +1,377 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const {
+	JAVASCRIPT_MODULE_TYPE_AUTO,
+	JAVASCRIPT_MODULE_TYPE_ESM
+} = require("../ModuleTypeConstants");
+const PureExpressionDependency = require("../dependencies/PureExpressionDependency");
+const InnerGraph = require("./InnerGraph");
+
+/** @typedef {import("estree").ClassDeclaration} ClassDeclarationNode */
+/** @typedef {import("estree").ClassExpression} ClassExpressionNode */
+/** @typedef {import("estree").Node} Node */
+/** @typedef {import("estree").VariableDeclarator} VariableDeclaratorNode */
+/** @typedef {import("../../declarations/WebpackOptions").JavascriptParserOptions} JavascriptParserOptions */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Dependency")} Dependency */
+/** @typedef {import("../dependencies/HarmonyImportSpecifierDependency")} HarmonyImportSpecifierDependency */
+/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
+/** @typedef {import("./InnerGraph").InnerGraph} InnerGraph */
+/** @typedef {import("./InnerGraph").TopLevelSymbol} TopLevelSymbol */
+
+const { topLevelSymbolTag } = InnerGraph;
+
+const PLUGIN_NAME = "InnerGraphPlugin";
+
+class InnerGraphPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			PLUGIN_NAME,
+			(compilation, { normalModuleFactory }) => {
+				const logger = compilation.getLogger("webpack.InnerGraphPlugin");
+
+				compilation.dependencyTemplates.set(
+					PureExpressionDependency,
+					new PureExpressionDependency.Template()
+				);
+
+				/**
+				 * @param {JavascriptParser} parser the parser
+				 * @param {JavascriptParserOptions} parserOptions options
+				 * @returns {void}
+				 */
+				const handler = (parser, parserOptions) => {
+					const onUsageSuper = sup => {
+						InnerGraph.onUsage(parser.state, usedByExports => {
+							switch (usedByExports) {
+								case undefined:
+								case true:
+									return;
+								default: {
+									const dep = new PureExpressionDependency(sup.range);
+									dep.loc = sup.loc;
+									dep.usedByExports = usedByExports;
+									parser.state.module.addDependency(dep);
+									break;
+								}
+							}
+						});
+					};
+
+					parser.hooks.program.tap(PLUGIN_NAME, () => {
+						InnerGraph.enable(parser.state);
+					});
+
+					parser.hooks.finish.tap(PLUGIN_NAME, () => {
+						if (!InnerGraph.isEnabled(parser.state)) return;
+
+						logger.time("infer dependency usage");
+						InnerGraph.inferDependencyUsage(parser.state);
+						logger.timeAggregate("infer dependency usage");
+					});
+
+					// During prewalking the following datastructures are filled with
+					// nodes that have a TopLevelSymbol assigned and
+					// variables are tagged with the assigned TopLevelSymbol
+
+					// We differ 3 types of nodes:
+					// 1. full statements (export default, function declaration)
+					// 2. classes (class declaration, class expression)
+					// 3. variable declarators (const x = ...)
+
+					/** @type {WeakMap<Node, TopLevelSymbol>} */
+					const statementWithTopLevelSymbol = new WeakMap();
+					/** @type {WeakMap<Node, Node>} */
+					const statementPurePart = new WeakMap();
+
+					/** @type {WeakMap<ClassExpressionNode | ClassDeclarationNode, TopLevelSymbol>} */
+					const classWithTopLevelSymbol = new WeakMap();
+
+					/** @type {WeakMap<VariableDeclaratorNode, TopLevelSymbol>} */
+					const declWithTopLevelSymbol = new WeakMap();
+					/** @type {WeakSet<VariableDeclaratorNode>} */
+					const pureDeclarators = new WeakSet();
+
+					// The following hooks are used during prewalking:
+
+					parser.hooks.preStatement.tap(PLUGIN_NAME, statement => {
+						if (!InnerGraph.isEnabled(parser.state)) return;
+
+						if (parser.scope.topLevelScope === true) {
+							if (statement.type === "FunctionDeclaration") {
+								const name = statement.id ? statement.id.name : "*default*";
+								const fn = InnerGraph.tagTopLevelSymbol(parser, name);
+								statementWithTopLevelSymbol.set(statement, fn);
+								return true;
+							}
+						}
+					});
+
+					parser.hooks.blockPreStatement.tap(PLUGIN_NAME, statement => {
+						if (!InnerGraph.isEnabled(parser.state)) return;
+
+						if (parser.scope.topLevelScope === true) {
+							if (
+								statement.type === "ClassDeclaration" &&
+								parser.isPure(statement, statement.range[0])
+							) {
+								const name = statement.id ? statement.id.name : "*default*";
+								const fn = InnerGraph.tagTopLevelSymbol(parser, name);
+								classWithTopLevelSymbol.set(statement, fn);
+								return true;
+							}
+							if (statement.type === "ExportDefaultDeclaration") {
+								const name = "*default*";
+								const fn = InnerGraph.tagTopLevelSymbol(parser, name);
+								const decl = statement.declaration;
+								if (
+									(decl.type === "ClassExpression" ||
+										decl.type === "ClassDeclaration") &&
+									parser.isPure(decl, decl.range[0])
+								) {
+									classWithTopLevelSymbol.set(decl, fn);
+								} else if (parser.isPure(decl, statement.range[0])) {
+									statementWithTopLevelSymbol.set(statement, fn);
+									if (
+										!decl.type.endsWith("FunctionExpression") &&
+										!decl.type.endsWith("Declaration") &&
+										decl.type !== "Literal"
+									) {
+										statementPurePart.set(statement, decl);
+									}
+								}
+							}
+						}
+					});
+
+					parser.hooks.preDeclarator.tap(PLUGIN_NAME, (decl, statement) => {
+						if (!InnerGraph.isEnabled(parser.state)) return;
+						if (
+							parser.scope.topLevelScope === true &&
+							decl.init &&
+							decl.id.type === "Identifier"
+						) {
+							const name = decl.id.name;
+							if (
+								decl.init.type === "ClassExpression" &&
+								parser.isPure(decl.init, decl.id.range[1])
+							) {
+								const fn = InnerGraph.tagTopLevelSymbol(parser, name);
+								classWithTopLevelSymbol.set(decl.init, fn);
+							} else if (parser.isPure(decl.init, decl.id.range[1])) {
+								const fn = InnerGraph.tagTopLevelSymbol(parser, name);
+								declWithTopLevelSymbol.set(decl, fn);
+								if (
+									!decl.init.type.endsWith("FunctionExpression") &&
+									decl.init.type !== "Literal"
+								) {
+									pureDeclarators.add(decl);
+								}
+								return true;
+							}
+						}
+					});
+
+					// During real walking we set the TopLevelSymbol state to the assigned
+					// TopLevelSymbol by using the fill datastructures.
+
+					// In addition to tracking TopLevelSymbols, we sometimes need to
+					// add a PureExpressionDependency. This is needed to skip execution
+					// of pure expressions, even when they are not dropped due to
+					// minimizing. Otherwise symbols used there might not exist anymore
+					// as they are removed as unused by this optimization
+
+					// When we find a reference to a TopLevelSymbol, we register a
+					// TopLevelSymbol dependency from TopLevelSymbol in state to the
+					// referenced TopLevelSymbol. This way we get a graph of all
+					// TopLevelSymbols.
+
+					// The following hooks are called during walking:
+
+					parser.hooks.statement.tap(PLUGIN_NAME, statement => {
+						if (!InnerGraph.isEnabled(parser.state)) return;
+						if (parser.scope.topLevelScope === true) {
+							InnerGraph.setTopLevelSymbol(parser.state, undefined);
+
+							const fn = statementWithTopLevelSymbol.get(statement);
+							if (fn) {
+								InnerGraph.setTopLevelSymbol(parser.state, fn);
+								const purePart = statementPurePart.get(statement);
+								if (purePart) {
+									InnerGraph.onUsage(parser.state, usedByExports => {
+										switch (usedByExports) {
+											case undefined:
+											case true:
+												return;
+											default: {
+												const dep = new PureExpressionDependency(
+													purePart.range
+												);
+												dep.loc = statement.loc;
+												dep.usedByExports = usedByExports;
+												parser.state.module.addDependency(dep);
+												break;
+											}
+										}
+									});
+								}
+							}
+						}
+					});
+
+					parser.hooks.classExtendsExpression.tap(
+						PLUGIN_NAME,
+						(expr, statement) => {
+							if (!InnerGraph.isEnabled(parser.state)) return;
+							if (parser.scope.topLevelScope === true) {
+								const fn = classWithTopLevelSymbol.get(statement);
+								if (
+									fn &&
+									parser.isPure(
+										expr,
+										statement.id ? statement.id.range[1] : statement.range[0]
+									)
+								) {
+									InnerGraph.setTopLevelSymbol(parser.state, fn);
+									onUsageSuper(expr);
+								}
+							}
+						}
+					);
+
+					parser.hooks.classBodyElement.tap(
+						PLUGIN_NAME,
+						(element, classDefinition) => {
+							if (!InnerGraph.isEnabled(parser.state)) return;
+							if (parser.scope.topLevelScope === true) {
+								const fn = classWithTopLevelSymbol.get(classDefinition);
+								if (fn) {
+									InnerGraph.setTopLevelSymbol(parser.state, undefined);
+								}
+							}
+						}
+					);
+
+					parser.hooks.classBodyValue.tap(
+						PLUGIN_NAME,
+						(expression, element, classDefinition) => {
+							if (!InnerGraph.isEnabled(parser.state)) return;
+							if (parser.scope.topLevelScope === true) {
+								const fn = classWithTopLevelSymbol.get(classDefinition);
+								if (fn) {
+									if (
+										!element.static ||
+										parser.isPure(
+											expression,
+											element.key ? element.key.range[1] : element.range[0]
+										)
+									) {
+										InnerGraph.setTopLevelSymbol(parser.state, fn);
+										if (element.type !== "MethodDefinition" && element.static) {
+											InnerGraph.onUsage(parser.state, usedByExports => {
+												switch (usedByExports) {
+													case undefined:
+													case true:
+														return;
+													default: {
+														const dep = new PureExpressionDependency(
+															expression.range
+														);
+														dep.loc = expression.loc;
+														dep.usedByExports = usedByExports;
+														parser.state.module.addDependency(dep);
+														break;
+													}
+												}
+											});
+										}
+									} else {
+										InnerGraph.setTopLevelSymbol(parser.state, undefined);
+									}
+								}
+							}
+						}
+					);
+
+					parser.hooks.declarator.tap(PLUGIN_NAME, (decl, statement) => {
+						if (!InnerGraph.isEnabled(parser.state)) return;
+						const fn = declWithTopLevelSymbol.get(decl);
+
+						if (fn) {
+							InnerGraph.setTopLevelSymbol(parser.state, fn);
+							if (pureDeclarators.has(decl)) {
+								if (decl.init.type === "ClassExpression") {
+									if (decl.init.superClass) {
+										onUsageSuper(decl.init.superClass);
+									}
+								} else {
+									InnerGraph.onUsage(parser.state, usedByExports => {
+										switch (usedByExports) {
+											case undefined:
+											case true:
+												return;
+											default: {
+												const dep = new PureExpressionDependency(
+													decl.init.range
+												);
+												dep.loc = decl.loc;
+												dep.usedByExports = usedByExports;
+												parser.state.module.addDependency(dep);
+												break;
+											}
+										}
+									});
+								}
+							}
+							parser.walkExpression(decl.init);
+							InnerGraph.setTopLevelSymbol(parser.state, undefined);
+							return true;
+						}
+					});
+
+					parser.hooks.expression
+						.for(topLevelSymbolTag)
+						.tap(PLUGIN_NAME, () => {
+							const topLevelSymbol = /** @type {TopLevelSymbol} */ (
+								parser.currentTagData
+							);
+							const currentTopLevelSymbol = InnerGraph.getTopLevelSymbol(
+								parser.state
+							);
+							InnerGraph.addUsage(
+								parser.state,
+								topLevelSymbol,
+								currentTopLevelSymbol || true
+							);
+						});
+					parser.hooks.assign.for(topLevelSymbolTag).tap(PLUGIN_NAME, expr => {
+						if (!InnerGraph.isEnabled(parser.state)) return;
+						if (expr.operator === "=") return true;
+					});
+				};
+				normalModuleFactory.hooks.parser
+					.for(JAVASCRIPT_MODULE_TYPE_AUTO)
+					.tap(PLUGIN_NAME, handler);
+				normalModuleFactory.hooks.parser
+					.for(JAVASCRIPT_MODULE_TYPE_ESM)
+					.tap(PLUGIN_NAME, handler);
+
+				compilation.hooks.finishModules.tap(PLUGIN_NAME, () => {
+					logger.timeAggregateEnd("infer dependency usage");
+				});
+			}
+		);
+	}
+}
+
+module.exports = InnerGraphPlugin;

my-app/node_modules/webpack/lib/optimize/LimitChunkCountPlugin.js

@@ -0,0 +1,281 @@
+/*
+	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
+ */
+
+/**
+ * @template K, V
+ * @param {Map<K, Set<V>>} map map
+ * @param {K} key key
+ * @param {V} value value
+ */
+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 =
+						/** @type {LimitChunkCountPluginOptions} */
+						(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
+						/**
+						 * @param {ChunkCombination} c combination
+						 * @returns {number} integrated size
+						 */
+						c => c.integratedSize,
+						(a, b) => a - b,
+						// Layer 3: ordered by position difference in orderedChunk (-> to be deterministic)
+						/**
+						 * @param {ChunkCombination} c combination
+						 * @returns {number} position difference
+						 */
+						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 /** @type {Set<ChunkCombination>} */ (
+								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 /** @type {Set<ChunkCombination>} */ (
+								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,
+								/** @type {Set<ChunkCombination>} */ (
+									combinationsByChunk.get(b)
+								)
+							);
+							combinationsByChunk.delete(b);
+						}
+					}
+					if (changed) return true;
+				}
+			);
+		});
+	}
+}
+module.exports = LimitChunkCountPlugin;

my-app/node_modules/webpack/lib/optimize/MangleExportsPlugin.js

@@ -0,0 +1,177 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { UsageState } = require("../ExportsInfo");
+const {
+	numberToIdentifier,
+	NUMBER_OF_IDENTIFIER_START_CHARS,
+	NUMBER_OF_IDENTIFIER_CONTINUATION_CHARS
+} = require("../Template");
+const { assignDeterministicIds } = require("../ids/IdHelpers");
+const { compareSelect, compareStringsNumeric } = require("../util/comparators");
+
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../ExportsInfo")} ExportsInfo */
+/** @typedef {import("../ExportsInfo").ExportInfo} ExportInfo */
+
+/**
+ * @param {ExportsInfo} exportsInfo exports info
+ * @returns {boolean} mangle is possible
+ */
+const canMangle = exportsInfo => {
+	if (exportsInfo.otherExportsInfo.getUsed(undefined) !== UsageState.Unused)
+		return false;
+	let hasSomethingToMangle = false;
+	for (const exportInfo of exportsInfo.exports) {
+		if (exportInfo.canMangle === true) {
+			hasSomethingToMangle = true;
+		}
+	}
+	return hasSomethingToMangle;
+};
+
+// Sort by name
+const comparator = compareSelect(e => e.name, compareStringsNumeric);
+/**
+ * @param {boolean} deterministic use deterministic names
+ * @param {ExportsInfo} exportsInfo exports info
+ * @param {boolean | undefined} isNamespace is namespace object
+ * @returns {void}
+ */
+const mangleExportsInfo = (deterministic, exportsInfo, isNamespace) => {
+	if (!canMangle(exportsInfo)) return;
+	const usedNames = new Set();
+	/** @type {ExportInfo[]} */
+	const mangleableExports = [];
+
+	// Avoid to renamed exports that are not provided when
+	// 1. it's not a namespace export: non-provided exports can be found in prototype chain
+	// 2. there are other provided exports and deterministic mode is chosen:
+	//    non-provided exports would break the determinism
+	let avoidMangleNonProvided = !isNamespace;
+	if (!avoidMangleNonProvided && deterministic) {
+		for (const exportInfo of exportsInfo.ownedExports) {
+			if (exportInfo.provided !== false) {
+				avoidMangleNonProvided = true;
+				break;
+			}
+		}
+	}
+	for (const exportInfo of exportsInfo.ownedExports) {
+		const name = exportInfo.name;
+		if (!exportInfo.hasUsedName()) {
+			if (
+				// Can the export be mangled?
+				exportInfo.canMangle !== true ||
+				// Never rename 1 char exports
+				(name.length === 1 && /^[a-zA-Z0-9_$]/.test(name)) ||
+				// Don't rename 2 char exports in deterministic mode
+				(deterministic &&
+					name.length === 2 &&
+					/^[a-zA-Z_$][a-zA-Z0-9_$]|^[1-9][0-9]/.test(name)) ||
+				// Don't rename exports that are not provided
+				(avoidMangleNonProvided && exportInfo.provided !== true)
+			) {
+				exportInfo.setUsedName(name);
+				usedNames.add(name);
+			} else {
+				mangleableExports.push(exportInfo);
+			}
+		}
+		if (exportInfo.exportsInfoOwned) {
+			const used = exportInfo.getUsed(undefined);
+			if (
+				used === UsageState.OnlyPropertiesUsed ||
+				used === UsageState.Unused
+			) {
+				mangleExportsInfo(deterministic, exportInfo.exportsInfo, false);
+			}
+		}
+	}
+	if (deterministic) {
+		assignDeterministicIds(
+			mangleableExports,
+			e => e.name,
+			comparator,
+			(e, id) => {
+				const name = numberToIdentifier(id);
+				const size = usedNames.size;
+				usedNames.add(name);
+				if (size === usedNames.size) return false;
+				e.setUsedName(name);
+				return true;
+			},
+			[
+				NUMBER_OF_IDENTIFIER_START_CHARS,
+				NUMBER_OF_IDENTIFIER_START_CHARS *
+					NUMBER_OF_IDENTIFIER_CONTINUATION_CHARS
+			],
+			NUMBER_OF_IDENTIFIER_CONTINUATION_CHARS,
+			usedNames.size
+		);
+	} else {
+		const usedExports = [];
+		const unusedExports = [];
+		for (const exportInfo of mangleableExports) {
+			if (exportInfo.getUsed(undefined) === UsageState.Unused) {
+				unusedExports.push(exportInfo);
+			} else {
+				usedExports.push(exportInfo);
+			}
+		}
+		usedExports.sort(comparator);
+		unusedExports.sort(comparator);
+		let i = 0;
+		for (const list of [usedExports, unusedExports]) {
+			for (const exportInfo of list) {
+				let name;
+				do {
+					name = numberToIdentifier(i++);
+				} while (usedNames.has(name));
+				exportInfo.setUsedName(name);
+			}
+		}
+	}
+};
+
+class MangleExportsPlugin {
+	/**
+	 * @param {boolean} deterministic use deterministic names
+	 */
+	constructor(deterministic) {
+		this._deterministic = deterministic;
+	}
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		const { _deterministic: deterministic } = this;
+		compiler.hooks.compilation.tap("MangleExportsPlugin", compilation => {
+			const moduleGraph = compilation.moduleGraph;
+			compilation.hooks.optimizeCodeGeneration.tap(
+				"MangleExportsPlugin",
+				modules => {
+					if (compilation.moduleMemCaches) {
+						throw new Error(
+							"optimization.mangleExports can't be used with cacheUnaffected as export mangling is a global effect"
+						);
+					}
+					for (const module of modules) {
+						const isNamespace =
+							module.buildMeta && module.buildMeta.exportsType === "namespace";
+						const exportsInfo = moduleGraph.getExportsInfo(module);
+						mangleExportsInfo(deterministic, exportsInfo, isNamespace);
+					}
+				}
+			);
+		});
+	}
+}
+
+module.exports = MangleExportsPlugin;

my-app/node_modules/webpack/lib/optimize/MergeDuplicateChunksPlugin.js

@@ -0,0 +1,115 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { STAGE_BASIC } = require("../OptimizationStages");
+const { runtimeEqual } = require("../util/runtime");
+
+/** @typedef {import("../Compiler")} Compiler */
+
+class MergeDuplicateChunksPlugin {
+	/**
+	 * @param {Compiler} compiler the compiler
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			"MergeDuplicateChunksPlugin",
+			compilation => {
+				compilation.hooks.optimizeChunks.tap(
+					{
+						name: "MergeDuplicateChunksPlugin",
+						stage: STAGE_BASIC
+					},
+					chunks => {
+						const { chunkGraph, moduleGraph } = compilation;
+
+						// remember already tested chunks for performance
+						const notDuplicates = new Set();
+
+						// for each chunk
+						for (const chunk of chunks) {
+							// track a Set of all chunk that could be duplicates
+							let possibleDuplicates;
+							for (const module of chunkGraph.getChunkModulesIterable(chunk)) {
+								if (possibleDuplicates === undefined) {
+									// when possibleDuplicates is not yet set,
+									// create a new Set from chunks of the current module
+									// including only chunks with the same number of modules
+									for (const dup of chunkGraph.getModuleChunksIterable(
+										module
+									)) {
+										if (
+											dup !== chunk &&
+											chunkGraph.getNumberOfChunkModules(chunk) ===
+												chunkGraph.getNumberOfChunkModules(dup) &&
+											!notDuplicates.has(dup)
+										) {
+											// delay allocating the new Set until here, reduce memory pressure
+											if (possibleDuplicates === undefined) {
+												possibleDuplicates = new Set();
+											}
+											possibleDuplicates.add(dup);
+										}
+									}
+									// when no chunk is possible we can break here
+									if (possibleDuplicates === undefined) break;
+								} else {
+									// validate existing possible duplicates
+									for (const dup of possibleDuplicates) {
+										// remove possible duplicate when module is not contained
+										if (!chunkGraph.isModuleInChunk(module, dup)) {
+											possibleDuplicates.delete(dup);
+										}
+									}
+									// when all chunks has been removed we can break here
+									if (possibleDuplicates.size === 0) break;
+								}
+							}
+
+							// when we found duplicates
+							if (
+								possibleDuplicates !== undefined &&
+								possibleDuplicates.size > 0
+							) {
+								outer: for (const otherChunk of possibleDuplicates) {
+									if (otherChunk.hasRuntime() !== chunk.hasRuntime()) continue;
+									if (chunkGraph.getNumberOfEntryModules(chunk) > 0) continue;
+									if (chunkGraph.getNumberOfEntryModules(otherChunk) > 0)
+										continue;
+									if (!runtimeEqual(chunk.runtime, otherChunk.runtime)) {
+										for (const module of chunkGraph.getChunkModulesIterable(
+											chunk
+										)) {
+											const exportsInfo = moduleGraph.getExportsInfo(module);
+											if (
+												!exportsInfo.isEquallyUsed(
+													chunk.runtime,
+													otherChunk.runtime
+												)
+											) {
+												continue outer;
+											}
+										}
+									}
+									// merge them
+									if (chunkGraph.canChunksBeIntegrated(chunk, otherChunk)) {
+										chunkGraph.integrateChunks(chunk, otherChunk);
+										compilation.chunks.delete(otherChunk);
+									}
+								}
+							}
+
+							// don't check already processed chunks twice
+							notDuplicates.add(chunk);
+						}
+					}
+				);
+			}
+		);
+	}
+}
+module.exports = MergeDuplicateChunksPlugin;

my-app/node_modules/webpack/lib/optimize/MinChunkSizePlugin.js

@@ -0,0 +1,113 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { STAGE_ADVANCED } = require("../OptimizationStages");
+const createSchemaValidation = require("../util/create-schema-validation");
+
+/** @typedef {import("../../declarations/plugins/optimize/MinChunkSizePlugin").MinChunkSizePluginOptions} MinChunkSizePluginOptions */
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../Compiler")} Compiler */
+
+const validate = createSchemaValidation(
+	require("../../schemas/plugins/optimize/MinChunkSizePlugin.check.js"),
+	() => require("../../schemas/plugins/optimize/MinChunkSizePlugin.json"),
+	{
+		name: "Min Chunk Size Plugin",
+		baseDataPath: "options"
+	}
+);
+
+class MinChunkSizePlugin {
+	/**
+	 * @param {MinChunkSizePluginOptions} options options object
+	 */
+	constructor(options) {
+		validate(options);
+		this.options = options;
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		const options = this.options;
+		const minChunkSize = options.minChunkSize;
+		compiler.hooks.compilation.tap("MinChunkSizePlugin", compilation => {
+			compilation.hooks.optimizeChunks.tap(
+				{
+					name: "MinChunkSizePlugin",
+					stage: STAGE_ADVANCED
+				},
+				chunks => {
+					const chunkGraph = compilation.chunkGraph;
+					const equalOptions = {
+						chunkOverhead: 1,
+						entryChunkMultiplicator: 1
+					};
+
+					const chunkSizesMap = new Map();
+					/** @type {[Chunk, Chunk][]} */
+					const combinations = [];
+					/** @type {Chunk[]} */
+					const smallChunks = [];
+					const visitedChunks = [];
+					for (const a of chunks) {
+						// check if one of the chunks sizes is smaller than the minChunkSize
+						// and filter pairs that can NOT be integrated!
+						if (chunkGraph.getChunkSize(a, equalOptions) < minChunkSize) {
+							smallChunks.push(a);
+							for (const b of visitedChunks) {
+								if (chunkGraph.canChunksBeIntegrated(b, a))
+									combinations.push([b, a]);
+							}
+						} else {
+							for (const b of smallChunks) {
+								if (chunkGraph.canChunksBeIntegrated(b, a))
+									combinations.push([b, a]);
+							}
+						}
+						chunkSizesMap.set(a, chunkGraph.getChunkSize(a, options));
+						visitedChunks.push(a);
+					}
+
+					const sortedSizeFilteredExtendedPairCombinations = combinations
+						.map(pair => {
+							// extend combination pairs with size and integrated size
+							const a = chunkSizesMap.get(pair[0]);
+							const b = chunkSizesMap.get(pair[1]);
+							const ab = chunkGraph.getIntegratedChunksSize(
+								pair[0],
+								pair[1],
+								options
+							);
+							/** @type {[number, number, Chunk, Chunk]} */
+							const extendedPair = [a + b - ab, ab, pair[0], pair[1]];
+							return extendedPair;
+						})
+						.sort((a, b) => {
+							// sadly javascript does an in place sort here
+							// sort by size
+							const diff = b[0] - a[0];
+							if (diff !== 0) return diff;
+							return a[1] - b[1];
+						});
+
+					if (sortedSizeFilteredExtendedPairCombinations.length === 0) return;
+
+					const pair = sortedSizeFilteredExtendedPairCombinations[0];
+
+					chunkGraph.integrateChunks(pair[2], pair[3]);
+					compilation.chunks.delete(pair[3]);
+					return true;
+				}
+			);
+		});
+	}
+}
+module.exports = MinChunkSizePlugin;

my-app/node_modules/webpack/lib/optimize/MinMaxSizeWarning.js

@@ -0,0 +1,35 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const SizeFormatHelpers = require("../SizeFormatHelpers");
+const WebpackError = require("../WebpackError");
+
+class MinMaxSizeWarning extends WebpackError {
+	/**
+	 * @param {string[] | undefined} keys keys
+	 * @param {number} minSize minimum size
+	 * @param {number} maxSize maximum size
+	 */
+	constructor(keys, minSize, maxSize) {
+		let keysMessage = "Fallback cache group";
+		if (keys) {
+			keysMessage =
+				keys.length > 1
+					? `Cache groups ${keys.sort().join(", ")}`
+					: `Cache group ${keys[0]}`;
+		}
+		super(
+			`SplitChunksPlugin\n` +
+				`${keysMessage}\n` +
+				`Configured minSize (${SizeFormatHelpers.formatSize(minSize)}) is ` +
+				`bigger than maxSize (${SizeFormatHelpers.formatSize(maxSize)}).\n` +
+				"This seem to be a invalid optimization.splitChunks configuration."
+		);
+	}
+}
+
+module.exports = MinMaxSizeWarning;

my-app/node_modules/webpack/lib/optimize/ModuleConcatenationPlugin.js

@@ -0,0 +1,942 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const asyncLib = require("neo-async");
+const ChunkGraph = require("../ChunkGraph");
+const ModuleGraph = require("../ModuleGraph");
+const { STAGE_DEFAULT } = require("../OptimizationStages");
+const HarmonyImportDependency = require("../dependencies/HarmonyImportDependency");
+const { compareModulesByIdentifier } = require("../util/comparators");
+const {
+	intersectRuntime,
+	mergeRuntimeOwned,
+	filterRuntime,
+	runtimeToString,
+	mergeRuntime
+} = require("../util/runtime");
+const ConcatenatedModule = require("./ConcatenatedModule");
+
+/** @typedef {import("../Compilation")} Compilation */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Module")} Module */
+/** @typedef {import("../RequestShortener")} RequestShortener */
+/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
+
+/**
+ * @typedef {Object} Statistics
+ * @property {number} cached
+ * @property {number} alreadyInConfig
+ * @property {number} invalidModule
+ * @property {number} incorrectChunks
+ * @property {number} incorrectDependency
+ * @property {number} incorrectModuleDependency
+ * @property {number} incorrectChunksOfImporter
+ * @property {number} incorrectRuntimeCondition
+ * @property {number} importerFailed
+ * @property {number} added
+ */
+
+/**
+ * @param {string} msg message
+ * @returns {string} formatted message
+ */
+const formatBailoutReason = msg => {
+	return "ModuleConcatenation bailout: " + msg;
+};
+
+class ModuleConcatenationPlugin {
+	constructor(options) {
+		if (typeof options !== "object") options = {};
+		this.options = options;
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		const { _backCompat: backCompat } = compiler;
+		compiler.hooks.compilation.tap("ModuleConcatenationPlugin", compilation => {
+			if (compilation.moduleMemCaches) {
+				throw new Error(
+					"optimization.concatenateModules can't be used with cacheUnaffected as module concatenation is a global effect"
+				);
+			}
+			const moduleGraph = compilation.moduleGraph;
+			/** @type {Map<Module, string | ((requestShortener: RequestShortener) => string)>} */
+			const bailoutReasonMap = new Map();
+
+			/**
+			 * @param {Module} module the module
+			 * @param {string | ((requestShortener: RequestShortener) => string)} reason the reason
+			 */
+			const setBailoutReason = (module, reason) => {
+				setInnerBailoutReason(module, reason);
+				moduleGraph
+					.getOptimizationBailout(module)
+					.push(
+						typeof reason === "function"
+							? rs => formatBailoutReason(reason(rs))
+							: formatBailoutReason(reason)
+					);
+			};
+
+			/**
+			 * @param {Module} module the module
+			 * @param {string | ((requestShortener: RequestShortener) => string)} reason the reason
+			 */
+			const setInnerBailoutReason = (module, reason) => {
+				bailoutReasonMap.set(module, reason);
+			};
+
+			/**
+			 * @param {Module} module the module
+			 * @param {RequestShortener} requestShortener the request shortener
+			 * @returns {string | ((requestShortener: RequestShortener) => string) | undefined} the reason
+			 */
+			const getInnerBailoutReason = (module, requestShortener) => {
+				const reason = bailoutReasonMap.get(module);
+				if (typeof reason === "function") return reason(requestShortener);
+				return reason;
+			};
+
+			/**
+			 * @param {Module} module the module
+			 * @param {Module | function(RequestShortener): string} problem the problem
+			 * @returns {(requestShortener: RequestShortener) => string} the reason
+			 */
+			const formatBailoutWarning = (module, problem) => requestShortener => {
+				if (typeof problem === "function") {
+					return formatBailoutReason(
+						`Cannot concat with ${module.readableIdentifier(
+							requestShortener
+						)}: ${problem(requestShortener)}`
+					);
+				}
+				const reason = getInnerBailoutReason(module, requestShortener);
+				const reasonWithPrefix = reason ? `: ${reason}` : "";
+				if (module === problem) {
+					return formatBailoutReason(
+						`Cannot concat with ${module.readableIdentifier(
+							requestShortener
+						)}${reasonWithPrefix}`
+					);
+				} else {
+					return formatBailoutReason(
+						`Cannot concat with ${module.readableIdentifier(
+							requestShortener
+						)} because of ${problem.readableIdentifier(
+							requestShortener
+						)}${reasonWithPrefix}`
+					);
+				}
+			};
+
+			compilation.hooks.optimizeChunkModules.tapAsync(
+				{
+					name: "ModuleConcatenationPlugin",
+					stage: STAGE_DEFAULT
+				},
+				(allChunks, modules, callback) => {
+					const logger = compilation.getLogger(
+						"webpack.ModuleConcatenationPlugin"
+					);
+					const { chunkGraph, moduleGraph } = compilation;
+					const relevantModules = [];
+					const possibleInners = new Set();
+					const context = {
+						chunkGraph,
+						moduleGraph
+					};
+					logger.time("select relevant modules");
+					for (const module of modules) {
+						let canBeRoot = true;
+						let canBeInner = true;
+
+						const bailoutReason = module.getConcatenationBailoutReason(context);
+						if (bailoutReason) {
+							setBailoutReason(module, bailoutReason);
+							continue;
+						}
+
+						// Must not be an async module
+						if (moduleGraph.isAsync(module)) {
+							setBailoutReason(module, `Module is async`);
+							continue;
+						}
+
+						// Must be in strict mode
+						if (!module.buildInfo.strict) {
+							setBailoutReason(module, `Module is not in strict mode`);
+							continue;
+						}
+
+						// Module must be in any chunk (we don't want to do useless work)
+						if (chunkGraph.getNumberOfModuleChunks(module) === 0) {
+							setBailoutReason(module, "Module is not in any chunk");
+							continue;
+						}
+
+						// Exports must be known (and not dynamic)
+						const exportsInfo = moduleGraph.getExportsInfo(module);
+						const relevantExports = exportsInfo.getRelevantExports(undefined);
+						const unknownReexports = relevantExports.filter(exportInfo => {
+							return (
+								exportInfo.isReexport() && !exportInfo.getTarget(moduleGraph)
+							);
+						});
+						if (unknownReexports.length > 0) {
+							setBailoutReason(
+								module,
+								`Reexports in this module do not have a static target (${Array.from(
+									unknownReexports,
+									exportInfo =>
+										`${
+											exportInfo.name || "other exports"
+										}: ${exportInfo.getUsedInfo()}`
+								).join(", ")})`
+							);
+							continue;
+						}
+
+						// Root modules must have a static list of exports
+						const unknownProvidedExports = relevantExports.filter(
+							exportInfo => {
+								return exportInfo.provided !== true;
+							}
+						);
+						if (unknownProvidedExports.length > 0) {
+							setBailoutReason(
+								module,
+								`List of module exports is dynamic (${Array.from(
+									unknownProvidedExports,
+									exportInfo =>
+										`${
+											exportInfo.name || "other exports"
+										}: ${exportInfo.getProvidedInfo()} and ${exportInfo.getUsedInfo()}`
+								).join(", ")})`
+							);
+							canBeRoot = false;
+						}
+
+						// Module must not be an entry point
+						if (chunkGraph.isEntryModule(module)) {
+							setInnerBailoutReason(module, "Module is an entry point");
+							canBeInner = false;
+						}
+
+						if (canBeRoot) relevantModules.push(module);
+						if (canBeInner) possibleInners.add(module);
+					}
+					logger.timeEnd("select relevant modules");
+					logger.debug(
+						`${relevantModules.length} potential root modules, ${possibleInners.size} potential inner modules`
+					);
+					// sort by depth
+					// modules with lower depth are more likely suited as roots
+					// this improves performance, because modules already selected as inner are skipped
+					logger.time("sort relevant modules");
+					relevantModules.sort((a, b) => {
+						return moduleGraph.getDepth(a) - moduleGraph.getDepth(b);
+					});
+					logger.timeEnd("sort relevant modules");
+
+					/** @type {Statistics} */
+					const stats = {
+						cached: 0,
+						alreadyInConfig: 0,
+						invalidModule: 0,
+						incorrectChunks: 0,
+						incorrectDependency: 0,
+						incorrectModuleDependency: 0,
+						incorrectChunksOfImporter: 0,
+						incorrectRuntimeCondition: 0,
+						importerFailed: 0,
+						added: 0
+					};
+					let statsCandidates = 0;
+					let statsSizeSum = 0;
+					let statsEmptyConfigurations = 0;
+
+					logger.time("find modules to concatenate");
+					const concatConfigurations = [];
+					const usedAsInner = new Set();
+					for (const currentRoot of relevantModules) {
+						// when used by another configuration as inner:
+						// the other configuration is better and we can skip this one
+						// TODO reconsider that when it's only used in a different runtime
+						if (usedAsInner.has(currentRoot)) continue;
+
+						let chunkRuntime = undefined;
+						for (const r of chunkGraph.getModuleRuntimes(currentRoot)) {
+							chunkRuntime = mergeRuntimeOwned(chunkRuntime, r);
+						}
+						const exportsInfo = moduleGraph.getExportsInfo(currentRoot);
+						const filteredRuntime = filterRuntime(chunkRuntime, r =>
+							exportsInfo.isModuleUsed(r)
+						);
+						const activeRuntime =
+							filteredRuntime === true
+								? chunkRuntime
+								: filteredRuntime === false
+								? undefined
+								: filteredRuntime;
+
+						// create a configuration with the root
+						const currentConfiguration = new ConcatConfiguration(
+							currentRoot,
+							activeRuntime
+						);
+
+						// cache failures to add modules
+						const failureCache = new Map();
+
+						// potential optional import candidates
+						/** @type {Set<Module>} */
+						const candidates = new Set();
+
+						// try to add all imports
+						for (const imp of this._getImports(
+							compilation,
+							currentRoot,
+							activeRuntime
+						)) {
+							candidates.add(imp);
+						}
+
+						for (const imp of candidates) {
+							const impCandidates = new Set();
+							const problem = this._tryToAdd(
+								compilation,
+								currentConfiguration,
+								imp,
+								chunkRuntime,
+								activeRuntime,
+								possibleInners,
+								impCandidates,
+								failureCache,
+								chunkGraph,
+								true,
+								stats
+							);
+							if (problem) {
+								failureCache.set(imp, problem);
+								currentConfiguration.addWarning(imp, problem);
+							} else {
+								for (const c of impCandidates) {
+									candidates.add(c);
+								}
+							}
+						}
+						statsCandidates += candidates.size;
+						if (!currentConfiguration.isEmpty()) {
+							const modules = currentConfiguration.getModules();
+							statsSizeSum += modules.size;
+							concatConfigurations.push(currentConfiguration);
+							for (const module of modules) {
+								if (module !== currentConfiguration.rootModule) {
+									usedAsInner.add(module);
+								}
+							}
+						} else {
+							statsEmptyConfigurations++;
+							const optimizationBailouts =
+								moduleGraph.getOptimizationBailout(currentRoot);
+							for (const warning of currentConfiguration.getWarningsSorted()) {
+								optimizationBailouts.push(
+									formatBailoutWarning(warning[0], warning[1])
+								);
+							}
+						}
+					}
+					logger.timeEnd("find modules to concatenate");
+					logger.debug(
+						`${
+							concatConfigurations.length
+						} successful concat configurations (avg size: ${
+							statsSizeSum / concatConfigurations.length
+						}), ${statsEmptyConfigurations} bailed out completely`
+					);
+					logger.debug(
+						`${statsCandidates} candidates were considered for adding (${stats.cached} cached failure, ${stats.alreadyInConfig} already in config, ${stats.invalidModule} invalid module, ${stats.incorrectChunks} incorrect chunks, ${stats.incorrectDependency} incorrect dependency, ${stats.incorrectChunksOfImporter} incorrect chunks of importer, ${stats.incorrectModuleDependency} incorrect module dependency, ${stats.incorrectRuntimeCondition} incorrect runtime condition, ${stats.importerFailed} importer failed, ${stats.added} added)`
+					);
+					// HACK: Sort configurations by length and start with the longest one
+					// to get the biggest groups possible. Used modules are marked with usedModules
+					// TODO: Allow to reuse existing configuration while trying to add dependencies.
+					// This would improve performance. O(n^2) -> O(n)
+					logger.time(`sort concat configurations`);
+					concatConfigurations.sort((a, b) => {
+						return b.modules.size - a.modules.size;
+					});
+					logger.timeEnd(`sort concat configurations`);
+					const usedModules = new Set();
+
+					logger.time("create concatenated modules");
+					asyncLib.each(
+						concatConfigurations,
+						(concatConfiguration, callback) => {
+							const rootModule = concatConfiguration.rootModule;
+
+							// Avoid overlapping configurations
+							// TODO: remove this when todo above is fixed
+							if (usedModules.has(rootModule)) return callback();
+							const modules = concatConfiguration.getModules();
+							for (const m of modules) {
+								usedModules.add(m);
+							}
+
+							// Create a new ConcatenatedModule
+							let newModule = ConcatenatedModule.create(
+								rootModule,
+								modules,
+								concatConfiguration.runtime,
+								compiler.root,
+								compilation.outputOptions.hashFunction
+							);
+
+							const build = () => {
+								newModule.build(
+									compiler.options,
+									compilation,
+									null,
+									null,
+									err => {
+										if (err) {
+											if (!err.module) {
+												err.module = newModule;
+											}
+											return callback(err);
+										}
+										integrate();
+									}
+								);
+							};
+
+							const integrate = () => {
+								if (backCompat) {
+									ChunkGraph.setChunkGraphForModule(newModule, chunkGraph);
+									ModuleGraph.setModuleGraphForModule(newModule, moduleGraph);
+								}
+
+								for (const warning of concatConfiguration.getWarningsSorted()) {
+									moduleGraph
+										.getOptimizationBailout(newModule)
+										.push(formatBailoutWarning(warning[0], warning[1]));
+								}
+								moduleGraph.cloneModuleAttributes(rootModule, newModule);
+								for (const m of modules) {
+									// add to builtModules when one of the included modules was built
+									if (compilation.builtModules.has(m)) {
+										compilation.builtModules.add(newModule);
+									}
+									if (m !== rootModule) {
+										// attach external references to the concatenated module too
+										moduleGraph.copyOutgoingModuleConnections(
+											m,
+											newModule,
+											c => {
+												return (
+													c.originModule === m &&
+													!(
+														c.dependency instanceof HarmonyImportDependency &&
+														modules.has(c.module)
+													)
+												);
+											}
+										);
+										// remove module from chunk
+										for (const chunk of chunkGraph.getModuleChunksIterable(
+											rootModule
+										)) {
+											const sourceTypes = chunkGraph.getChunkModuleSourceTypes(
+												chunk,
+												m
+											);
+											if (sourceTypes.size === 1) {
+												chunkGraph.disconnectChunkAndModule(chunk, m);
+											} else {
+												const newSourceTypes = new Set(sourceTypes);
+												newSourceTypes.delete("javascript");
+												chunkGraph.setChunkModuleSourceTypes(
+													chunk,
+													m,
+													newSourceTypes
+												);
+											}
+										}
+									}
+								}
+								compilation.modules.delete(rootModule);
+								ChunkGraph.clearChunkGraphForModule(rootModule);
+								ModuleGraph.clearModuleGraphForModule(rootModule);
+
+								// remove module from chunk
+								chunkGraph.replaceModule(rootModule, newModule);
+								// replace module references with the concatenated module
+								moduleGraph.moveModuleConnections(rootModule, newModule, c => {
+									const otherModule =
+										c.module === rootModule ? c.originModule : c.module;
+									const innerConnection =
+										c.dependency instanceof HarmonyImportDependency &&
+										modules.has(/** @type {Module} */ (otherModule));
+									return !innerConnection;
+								});
+								// add concatenated module to the compilation
+								compilation.modules.add(newModule);
+
+								callback();
+							};
+
+							build();
+						},
+						err => {
+							logger.timeEnd("create concatenated modules");
+							process.nextTick(callback.bind(null, err));
+						}
+					);
+				}
+			);
+		});
+	}
+
+	/**
+	 * @param {Compilation} compilation the compilation
+	 * @param {Module} module the module to be added
+	 * @param {RuntimeSpec} runtime the runtime scope
+	 * @returns {Set<Module>} the imported modules
+	 */
+	_getImports(compilation, module, runtime) {
+		const moduleGraph = compilation.moduleGraph;
+		const set = new Set();
+		for (const dep of module.dependencies) {
+			// Get reference info only for harmony Dependencies
+			if (!(dep instanceof HarmonyImportDependency)) continue;
+
+			const connection = moduleGraph.getConnection(dep);
+			// Reference is valid and has a module
+			if (
+				!connection ||
+				!connection.module ||
+				!connection.isTargetActive(runtime)
+			) {
+				continue;
+			}
+
+			const importedNames = compilation.getDependencyReferencedExports(
+				dep,
+				undefined
+			);
+
+			if (
+				importedNames.every(i =>
+					Array.isArray(i) ? i.length > 0 : i.name.length > 0
+				) ||
+				Array.isArray(moduleGraph.getProvidedExports(module))
+			) {
+				set.add(connection.module);
+			}
+		}
+		return set;
+	}
+
+	/**
+	 * @param {Compilation} compilation webpack compilation
+	 * @param {ConcatConfiguration} config concat configuration (will be modified when added)
+	 * @param {Module} module the module to be added
+	 * @param {RuntimeSpec} runtime the runtime scope of the generated code
+	 * @param {RuntimeSpec} activeRuntime the runtime scope of the root module
+	 * @param {Set<Module>} possibleModules modules that are candidates
+	 * @param {Set<Module>} candidates list of potential candidates (will be added to)
+	 * @param {Map<Module, Module | function(RequestShortener): string>} failureCache cache for problematic modules to be more performant
+	 * @param {ChunkGraph} chunkGraph the chunk graph
+	 * @param {boolean} avoidMutateOnFailure avoid mutating the config when adding fails
+	 * @param {Statistics} statistics gathering metrics
+	 * @returns {null | Module | function(RequestShortener): string} the problematic module
+	 */
+	_tryToAdd(
+		compilation,
+		config,
+		module,
+		runtime,
+		activeRuntime,
+		possibleModules,
+		candidates,
+		failureCache,
+		chunkGraph,
+		avoidMutateOnFailure,
+		statistics
+	) {
+		const cacheEntry = failureCache.get(module);
+		if (cacheEntry) {
+			statistics.cached++;
+			return cacheEntry;
+		}
+
+		// Already added?
+		if (config.has(module)) {
+			statistics.alreadyInConfig++;
+			return null;
+		}
+
+		// Not possible to add?
+		if (!possibleModules.has(module)) {
+			statistics.invalidModule++;
+			failureCache.set(module, module); // cache failures for performance
+			return module;
+		}
+
+		// Module must be in the correct chunks
+		const missingChunks = Array.from(
+			chunkGraph.getModuleChunksIterable(config.rootModule)
+		).filter(chunk => !chunkGraph.isModuleInChunk(module, chunk));
+		if (missingChunks.length > 0) {
+			/**
+			 * @param {RequestShortener} requestShortener request shortener
+			 * @returns {string} problem description
+			 */
+			const problem = requestShortener => {
+				const missingChunksList = Array.from(
+					new Set(missingChunks.map(chunk => chunk.name || "unnamed chunk(s)"))
+				).sort();
+				const chunks = Array.from(
+					new Set(
+						Array.from(chunkGraph.getModuleChunksIterable(module)).map(
+							chunk => chunk.name || "unnamed chunk(s)"
+						)
+					)
+				).sort();
+				return `Module ${module.readableIdentifier(
+					requestShortener
+				)} is not in the same chunk(s) (expected in chunk(s) ${missingChunksList.join(
+					", "
+				)}, module is in chunk(s) ${chunks.join(", ")})`;
+			};
+			statistics.incorrectChunks++;
+			failureCache.set(module, problem); // cache failures for performance
+			return problem;
+		}
+
+		const moduleGraph = compilation.moduleGraph;
+
+		const incomingConnections =
+			moduleGraph.getIncomingConnectionsByOriginModule(module);
+
+		const incomingConnectionsFromNonModules =
+			incomingConnections.get(null) || incomingConnections.get(undefined);
+		if (incomingConnectionsFromNonModules) {
+			const activeNonModulesConnections =
+				incomingConnectionsFromNonModules.filter(connection => {
+					// We are not interested in inactive connections
+					// or connections without dependency
+					return connection.isActive(runtime);
+				});
+			if (activeNonModulesConnections.length > 0) {
+				/**
+				 * @param {RequestShortener} requestShortener request shortener
+				 * @returns {string} problem description
+				 */
+				const problem = requestShortener => {
+					const importingExplanations = new Set(
+						activeNonModulesConnections.map(c => c.explanation).filter(Boolean)
+					);
+					const explanations = Array.from(importingExplanations).sort();
+					return `Module ${module.readableIdentifier(
+						requestShortener
+					)} is referenced ${
+						explanations.length > 0
+							? `by: ${explanations.join(", ")}`
+							: "in an unsupported way"
+					}`;
+				};
+				statistics.incorrectDependency++;
+				failureCache.set(module, problem); // cache failures for performance
+				return problem;
+			}
+		}
+
+		/** @type {Map<Module, readonly ModuleGraph.ModuleGraphConnection[]>} */
+		const incomingConnectionsFromModules = new Map();
+		for (const [originModule, connections] of incomingConnections) {
+			if (originModule) {
+				// Ignore connection from orphan modules
+				if (chunkGraph.getNumberOfModuleChunks(originModule) === 0) continue;
+
+				// We don't care for connections from other runtimes
+				let originRuntime = undefined;
+				for (const r of chunkGraph.getModuleRuntimes(originModule)) {
+					originRuntime = mergeRuntimeOwned(originRuntime, r);
+				}
+
+				if (!intersectRuntime(runtime, originRuntime)) continue;
+
+				// We are not interested in inactive connections
+				const activeConnections = connections.filter(connection =>
+					connection.isActive(runtime)
+				);
+				if (activeConnections.length > 0)
+					incomingConnectionsFromModules.set(originModule, activeConnections);
+			}
+		}
+
+		const incomingModules = Array.from(incomingConnectionsFromModules.keys());
+
+		// Module must be in the same chunks like the referencing module
+		const otherChunkModules = incomingModules.filter(originModule => {
+			for (const chunk of chunkGraph.getModuleChunksIterable(
+				config.rootModule
+			)) {
+				if (!chunkGraph.isModuleInChunk(originModule, chunk)) {
+					return true;
+				}
+			}
+			return false;
+		});
+		if (otherChunkModules.length > 0) {
+			/**
+			 * @param {RequestShortener} requestShortener request shortener
+			 * @returns {string} problem description
+			 */
+			const problem = requestShortener => {
+				const names = otherChunkModules
+					.map(m => m.readableIdentifier(requestShortener))
+					.sort();
+				return `Module ${module.readableIdentifier(
+					requestShortener
+				)} is referenced from different chunks by these modules: ${names.join(
+					", "
+				)}`;
+			};
+			statistics.incorrectChunksOfImporter++;
+			failureCache.set(module, problem); // cache failures for performance
+			return problem;
+		}
+
+		/** @type {Map<Module, readonly ModuleGraph.ModuleGraphConnection[]>} */
+		const nonHarmonyConnections = new Map();
+		for (const [originModule, connections] of incomingConnectionsFromModules) {
+			const selected = connections.filter(
+				connection =>
+					!connection.dependency ||
+					!(connection.dependency instanceof HarmonyImportDependency)
+			);
+			if (selected.length > 0)
+				nonHarmonyConnections.set(originModule, connections);
+		}
+		if (nonHarmonyConnections.size > 0) {
+			/**
+			 * @param {RequestShortener} requestShortener request shortener
+			 * @returns {string} problem description
+			 */
+			const problem = requestShortener => {
+				const names = Array.from(nonHarmonyConnections)
+					.map(([originModule, connections]) => {
+						return `${originModule.readableIdentifier(
+							requestShortener
+						)} (referenced with ${Array.from(
+							new Set(
+								connections
+									.map(c => c.dependency && c.dependency.type)
+									.filter(Boolean)
+							)
+						)
+							.sort()
+							.join(", ")})`;
+					})
+					.sort();
+				return `Module ${module.readableIdentifier(
+					requestShortener
+				)} is referenced from these modules with unsupported syntax: ${names.join(
+					", "
+				)}`;
+			};
+			statistics.incorrectModuleDependency++;
+			failureCache.set(module, problem); // cache failures for performance
+			return problem;
+		}
+
+		if (runtime !== undefined && typeof runtime !== "string") {
+			// Module must be consistently referenced in the same runtimes
+			/** @type {{ originModule: Module, runtimeCondition: RuntimeSpec }[]} */
+			const otherRuntimeConnections = [];
+			outer: for (const [
+				originModule,
+				connections
+			] of incomingConnectionsFromModules) {
+				/** @type {false | RuntimeSpec} */
+				let currentRuntimeCondition = false;
+				for (const connection of connections) {
+					const runtimeCondition = filterRuntime(runtime, runtime => {
+						return connection.isTargetActive(runtime);
+					});
+					if (runtimeCondition === false) continue;
+					if (runtimeCondition === true) continue outer;
+					if (currentRuntimeCondition !== false) {
+						currentRuntimeCondition = mergeRuntime(
+							currentRuntimeCondition,
+							runtimeCondition
+						);
+					} else {
+						currentRuntimeCondition = runtimeCondition;
+					}
+				}
+				if (currentRuntimeCondition !== false) {
+					otherRuntimeConnections.push({
+						originModule,
+						runtimeCondition: currentRuntimeCondition
+					});
+				}
+			}
+			if (otherRuntimeConnections.length > 0) {
+				/**
+				 * @param {RequestShortener} requestShortener request shortener
+				 * @returns {string} problem description
+				 */
+				const problem = requestShortener => {
+					return `Module ${module.readableIdentifier(
+						requestShortener
+					)} is runtime-dependent referenced by these modules: ${Array.from(
+						otherRuntimeConnections,
+						({ originModule, runtimeCondition }) =>
+							`${originModule.readableIdentifier(
+								requestShortener
+							)} (expected runtime ${runtimeToString(
+								runtime
+							)}, module is only referenced in ${runtimeToString(
+								/** @type {RuntimeSpec} */ (runtimeCondition)
+							)})`
+					).join(", ")}`;
+				};
+				statistics.incorrectRuntimeCondition++;
+				failureCache.set(module, problem); // cache failures for performance
+				return problem;
+			}
+		}
+
+		let backup;
+		if (avoidMutateOnFailure) {
+			backup = config.snapshot();
+		}
+
+		// Add the module
+		config.add(module);
+
+		incomingModules.sort(compareModulesByIdentifier);
+
+		// Every module which depends on the added module must be in the configuration too.
+		for (const originModule of incomingModules) {
+			const problem = this._tryToAdd(
+				compilation,
+				config,
+				originModule,
+				runtime,
+				activeRuntime,
+				possibleModules,
+				candidates,
+				failureCache,
+				chunkGraph,
+				false,
+				statistics
+			);
+			if (problem) {
+				if (backup !== undefined) config.rollback(backup);
+				statistics.importerFailed++;
+				failureCache.set(module, problem); // cache failures for performance
+				return problem;
+			}
+		}
+
+		// Add imports to possible candidates list
+		for (const imp of this._getImports(compilation, module, runtime)) {
+			candidates.add(imp);
+		}
+		statistics.added++;
+		return null;
+	}
+}
+
+class ConcatConfiguration {
+	/**
+	 * @param {Module} rootModule the root module
+	 * @param {RuntimeSpec} runtime the runtime
+	 */
+	constructor(rootModule, runtime) {
+		this.rootModule = rootModule;
+		this.runtime = runtime;
+		/** @type {Set<Module>} */
+		this.modules = new Set();
+		this.modules.add(rootModule);
+		/** @type {Map<Module, Module | function(RequestShortener): string>} */
+		this.warnings = new Map();
+	}
+
+	/**
+	 * @param {Module} module the module
+	 */
+	add(module) {
+		this.modules.add(module);
+	}
+
+	/**
+	 * @param {Module} module the module
+	 * @returns {boolean} true, when the module is in the module set
+	 */
+	has(module) {
+		return this.modules.has(module);
+	}
+
+	isEmpty() {
+		return this.modules.size === 1;
+	}
+
+	/**
+	 * @param {Module} module the module
+	 * @param {Module | function(RequestShortener): string} problem the problem
+	 */
+	addWarning(module, problem) {
+		this.warnings.set(module, problem);
+	}
+
+	/**
+	 * @returns {Map<Module, Module | function(RequestShortener): string>} warnings
+	 */
+	getWarningsSorted() {
+		return new Map(
+			Array.from(this.warnings).sort((a, b) => {
+				const ai = a[0].identifier();
+				const bi = b[0].identifier();
+				if (ai < bi) return -1;
+				if (ai > bi) return 1;
+				return 0;
+			})
+		);
+	}
+
+	/**
+	 * @returns {Set<Module>} modules as set
+	 */
+	getModules() {
+		return this.modules;
+	}
+
+	snapshot() {
+		return this.modules.size;
+	}
+
+	rollback(snapshot) {
+		const modules = this.modules;
+		for (const m of modules) {
+			if (snapshot === 0) {
+				modules.delete(m);
+			} else {
+				snapshot--;
+			}
+		}
+	}
+}
+
+module.exports = ModuleConcatenationPlugin;

my-app/node_modules/webpack/lib/optimize/RealContentHashPlugin.js

@@ -0,0 +1,467 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { SyncBailHook } = require("tapable");
+const { RawSource, CachedSource, CompatSource } = require("webpack-sources");
+const Compilation = require("../Compilation");
+const WebpackError = require("../WebpackError");
+const { compareSelect, compareStrings } = require("../util/comparators");
+const createHash = require("../util/createHash");
+
+/** @typedef {import("webpack-sources").Source} Source */
+/** @typedef {import("../Cache").Etag} Etag */
+/** @typedef {import("../Compilation").AssetInfo} AssetInfo */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {typeof import("../util/Hash")} Hash */
+
+const EMPTY_SET = new Set();
+
+/**
+ * @template T
+ * @param {T | T[]} itemOrItems item or items
+ * @param {Set<T>} list list
+ */
+const addToList = (itemOrItems, list) => {
+	if (Array.isArray(itemOrItems)) {
+		for (const item of itemOrItems) {
+			list.add(item);
+		}
+	} else if (itemOrItems) {
+		list.add(itemOrItems);
+	}
+};
+
+/**
+ * @template T
+ * @param {T[]} input list
+ * @param {function(T): Buffer} fn map function
+ * @returns {Buffer[]} buffers without duplicates
+ */
+const mapAndDeduplicateBuffers = (input, fn) => {
+	// Buffer.equals compares size first so this should be efficient enough
+	// If it becomes a performance problem we can use a map and group by size
+	// instead of looping over all assets.
+	const result = [];
+	outer: for (const value of input) {
+		const buf = fn(value);
+		for (const other of result) {
+			if (buf.equals(other)) continue outer;
+		}
+		result.push(buf);
+	}
+	return result;
+};
+
+/**
+ * Escapes regular expression metacharacters
+ * @param {string} str String to quote
+ * @returns {string} Escaped string
+ */
+const quoteMeta = str => {
+	return str.replace(/[-[\]\\/{}()*+?.^$|]/g, "\\$&");
+};
+
+const cachedSourceMap = new WeakMap();
+
+/**
+ * @param {Source} source source
+ * @returns {CachedSource} cached source
+ */
+const toCachedSource = source => {
+	if (source instanceof CachedSource) {
+		return source;
+	}
+	const entry = cachedSourceMap.get(source);
+	if (entry !== undefined) return entry;
+	const newSource = new CachedSource(CompatSource.from(source));
+	cachedSourceMap.set(source, newSource);
+	return newSource;
+};
+
+/** @typedef {Set<string>} OwnHashes */
+/** @typedef {Set<string>} ReferencedHashes */
+/** @typedef {Set<string>} Hashes */
+
+/**
+ * @typedef {Object} AssetInfoForRealContentHash
+ * @property {string} name
+ * @property {AssetInfo} info
+ * @property {Source} source
+ * @property {RawSource | undefined} newSource
+ * @property {RawSource | undefined} newSourceWithoutOwn
+ * @property {string} content
+ * @property {OwnHashes | undefined} ownHashes
+ * @property {Promise<void> | undefined} contentComputePromise
+ * @property {Promise<void> | undefined} contentComputeWithoutOwnPromise
+ * @property {ReferencedHashes | undefined} referencedHashes
+ * @property {Hashes} hashes
+ */
+
+/**
+ * @typedef {Object} CompilationHooks
+ * @property {SyncBailHook<[Buffer[], string], string>} updateHash
+ */
+
+/** @type {WeakMap<Compilation, CompilationHooks>} */
+const compilationHooksMap = new WeakMap();
+
+class RealContentHashPlugin {
+	/**
+	 * @param {Compilation} compilation the compilation
+	 * @returns {CompilationHooks} the attached hooks
+	 */
+	static getCompilationHooks(compilation) {
+		if (!(compilation instanceof Compilation)) {
+			throw new TypeError(
+				"The 'compilation' argument must be an instance of Compilation"
+			);
+		}
+		let hooks = compilationHooksMap.get(compilation);
+		if (hooks === undefined) {
+			hooks = {
+				updateHash: new SyncBailHook(["content", "oldHash"])
+			};
+			compilationHooksMap.set(compilation, hooks);
+		}
+		return hooks;
+	}
+
+	/**
+	 * @param {Object} options options object
+	 * @param {string | Hash} options.hashFunction the hash function to use
+	 * @param {string} options.hashDigest the hash digest to use
+	 */
+	constructor({ hashFunction, hashDigest }) {
+		this._hashFunction = hashFunction;
+		this._hashDigest = hashDigest;
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap("RealContentHashPlugin", compilation => {
+			const cacheAnalyse = compilation.getCache(
+				"RealContentHashPlugin|analyse"
+			);
+			const cacheGenerate = compilation.getCache(
+				"RealContentHashPlugin|generate"
+			);
+			const hooks = RealContentHashPlugin.getCompilationHooks(compilation);
+			compilation.hooks.processAssets.tapPromise(
+				{
+					name: "RealContentHashPlugin",
+					stage: Compilation.PROCESS_ASSETS_STAGE_OPTIMIZE_HASH
+				},
+				async () => {
+					const assets = compilation.getAssets();
+					/** @type {AssetInfoForRealContentHash[]} */
+					const assetsWithInfo = [];
+					/** @type {Map<string, [AssetInfoForRealContentHash]>} */
+					const hashToAssets = new Map();
+					for (const { source, info, name } of assets) {
+						const cachedSource = toCachedSource(source);
+						const content = /** @type {string} */ (cachedSource.source());
+						/** @type {Hashes} */
+						const hashes = new Set();
+						addToList(info.contenthash, hashes);
+						/** @type {AssetInfoForRealContentHash} */
+						const data = {
+							name,
+							info,
+							source: cachedSource,
+							newSource: undefined,
+							newSourceWithoutOwn: undefined,
+							content,
+							ownHashes: undefined,
+							contentComputePromise: undefined,
+							contentComputeWithoutOwnPromise: undefined,
+							referencedHashes: undefined,
+							hashes
+						};
+						assetsWithInfo.push(data);
+						for (const hash of hashes) {
+							const list = hashToAssets.get(hash);
+							if (list === undefined) {
+								hashToAssets.set(hash, [data]);
+							} else {
+								list.push(data);
+							}
+						}
+					}
+					if (hashToAssets.size === 0) return;
+					const hashRegExp = new RegExp(
+						Array.from(hashToAssets.keys(), quoteMeta).join("|"),
+						"g"
+					);
+					await Promise.all(
+						assetsWithInfo.map(async asset => {
+							const { name, source, content, hashes } = asset;
+							if (Buffer.isBuffer(content)) {
+								asset.referencedHashes = EMPTY_SET;
+								asset.ownHashes = EMPTY_SET;
+								return;
+							}
+							const etag = cacheAnalyse.mergeEtags(
+								cacheAnalyse.getLazyHashedEtag(source),
+								Array.from(hashes).join("|")
+							);
+							[asset.referencedHashes, asset.ownHashes] =
+								await cacheAnalyse.providePromise(name, etag, () => {
+									const referencedHashes = new Set();
+									let ownHashes = new Set();
+									const inContent = content.match(hashRegExp);
+									if (inContent) {
+										for (const hash of inContent) {
+											if (hashes.has(hash)) {
+												ownHashes.add(hash);
+												continue;
+											}
+											referencedHashes.add(hash);
+										}
+									}
+									return [referencedHashes, ownHashes];
+								});
+						})
+					);
+					/**
+					 * @param {string} hash the hash
+					 * @returns {undefined | ReferencedHashes} the referenced hashes
+					 */
+					const getDependencies = hash => {
+						const assets = hashToAssets.get(hash);
+						if (!assets) {
+							const referencingAssets = assetsWithInfo.filter(asset =>
+								/** @type {ReferencedHashes} */ (asset.referencedHashes).has(
+									hash
+								)
+							);
+							const err = new WebpackError(`RealContentHashPlugin
+Some kind of unexpected caching problem occurred.
+An asset was cached with a reference to another asset (${hash}) that's not in the compilation anymore.
+Either the asset was incorrectly cached, or the referenced asset should also be restored from cache.
+Referenced by:
+${referencingAssets
+	.map(a => {
+		const match = new RegExp(`.{0,20}${quoteMeta(hash)}.{0,20}`).exec(
+			a.content
+		);
+		return ` - ${a.name}: ...${match ? match[0] : "???"}...`;
+	})
+	.join("\n")}`);
+							compilation.errors.push(err);
+							return undefined;
+						}
+						const hashes = new Set();
+						for (const { referencedHashes, ownHashes } of assets) {
+							if (!(/** @type {OwnHashes} */ (ownHashes).has(hash))) {
+								for (const hash of /** @type {OwnHashes} */ (ownHashes)) {
+									hashes.add(hash);
+								}
+							}
+							for (const hash of /** @type {ReferencedHashes} */ (
+								referencedHashes
+							)) {
+								hashes.add(hash);
+							}
+						}
+						return hashes;
+					};
+					/**
+					 * @param {string} hash the hash
+					 * @returns {string} the hash info
+					 */
+					const hashInfo = hash => {
+						const assets = hashToAssets.get(hash);
+						return `${hash} (${Array.from(
+							/** @type {AssetInfoForRealContentHash[]} */ (assets),
+							a => a.name
+						)})`;
+					};
+					const hashesInOrder = new Set();
+					for (const hash of hashToAssets.keys()) {
+						/**
+						 * @param {string} hash the hash
+						 * @param {Set<string>} stack stack of hashes
+						 */
+						const add = (hash, stack) => {
+							const deps = getDependencies(hash);
+							if (!deps) return;
+							stack.add(hash);
+							for (const dep of deps) {
+								if (hashesInOrder.has(dep)) continue;
+								if (stack.has(dep)) {
+									throw new Error(
+										`Circular hash dependency ${Array.from(
+											stack,
+											hashInfo
+										).join(" -> ")} -> ${hashInfo(dep)}`
+									);
+								}
+								add(dep, stack);
+							}
+							hashesInOrder.add(hash);
+							stack.delete(hash);
+						};
+						if (hashesInOrder.has(hash)) continue;
+						add(hash, new Set());
+					}
+					const hashToNewHash = new Map();
+					/**
+					 * @param {AssetInfoForRealContentHash} asset asset info
+					 * @returns {Etag} etag
+					 */
+					const getEtag = asset =>
+						cacheGenerate.mergeEtags(
+							cacheGenerate.getLazyHashedEtag(asset.source),
+							Array.from(
+								/** @type {ReferencedHashes} */ (asset.referencedHashes),
+								hash => hashToNewHash.get(hash)
+							).join("|")
+						);
+					/**
+					 * @param {AssetInfoForRealContentHash} asset asset info
+					 * @returns {Promise<void>}
+					 */
+					const computeNewContent = asset => {
+						if (asset.contentComputePromise) return asset.contentComputePromise;
+						return (asset.contentComputePromise = (async () => {
+							if (
+								/** @type {OwnHashes} */ (asset.ownHashes).size > 0 ||
+								Array.from(
+									/** @type {ReferencedHashes} */
+									(asset.referencedHashes)
+								).some(hash => hashToNewHash.get(hash) !== hash)
+							) {
+								const identifier = asset.name;
+								const etag = getEtag(asset);
+								asset.newSource = await cacheGenerate.providePromise(
+									identifier,
+									etag,
+									() => {
+										const newContent = asset.content.replace(hashRegExp, hash =>
+											hashToNewHash.get(hash)
+										);
+										return new RawSource(newContent);
+									}
+								);
+							}
+						})());
+					};
+					/**
+					 * @param {AssetInfoForRealContentHash} asset asset info
+					 * @returns {Promise<void>}
+					 */
+					const computeNewContentWithoutOwn = asset => {
+						if (asset.contentComputeWithoutOwnPromise)
+							return asset.contentComputeWithoutOwnPromise;
+						return (asset.contentComputeWithoutOwnPromise = (async () => {
+							if (
+								/** @type {OwnHashes} */ (asset.ownHashes).size > 0 ||
+								Array.from(
+									/** @type {ReferencedHashes} */
+									(asset.referencedHashes)
+								).some(hash => hashToNewHash.get(hash) !== hash)
+							) {
+								const identifier = asset.name + "|without-own";
+								const etag = getEtag(asset);
+								asset.newSourceWithoutOwn = await cacheGenerate.providePromise(
+									identifier,
+									etag,
+									() => {
+										const newContent = asset.content.replace(
+											hashRegExp,
+											hash => {
+												if (
+													/** @type {OwnHashes} */ (asset.ownHashes).has(hash)
+												) {
+													return "";
+												}
+												return hashToNewHash.get(hash);
+											}
+										);
+										return new RawSource(newContent);
+									}
+								);
+							}
+						})());
+					};
+					const comparator = compareSelect(a => a.name, compareStrings);
+					for (const oldHash of hashesInOrder) {
+						const assets =
+							/** @type {AssetInfoForRealContentHash[]} */
+							(hashToAssets.get(oldHash));
+						assets.sort(comparator);
+						await Promise.all(
+							assets.map(asset =>
+								/** @type {OwnHashes} */ (asset.ownHashes).has(oldHash)
+									? computeNewContentWithoutOwn(asset)
+									: computeNewContent(asset)
+							)
+						);
+						const assetsContent = mapAndDeduplicateBuffers(assets, asset => {
+							if (/** @type {OwnHashes} */ (asset.ownHashes).has(oldHash)) {
+								return asset.newSourceWithoutOwn
+									? asset.newSourceWithoutOwn.buffer()
+									: asset.source.buffer();
+							} else {
+								return asset.newSource
+									? asset.newSource.buffer()
+									: asset.source.buffer();
+							}
+						});
+						let newHash = hooks.updateHash.call(assetsContent, oldHash);
+						if (!newHash) {
+							const hash = createHash(this._hashFunction);
+							if (compilation.outputOptions.hashSalt) {
+								hash.update(compilation.outputOptions.hashSalt);
+							}
+							for (const content of assetsContent) {
+								hash.update(content);
+							}
+							const digest = hash.digest(this._hashDigest);
+							newHash = /** @type {string} */ (digest.slice(0, oldHash.length));
+						}
+						hashToNewHash.set(oldHash, newHash);
+					}
+					await Promise.all(
+						assetsWithInfo.map(async asset => {
+							await computeNewContent(asset);
+							const newName = asset.name.replace(hashRegExp, hash =>
+								hashToNewHash.get(hash)
+							);
+
+							const infoUpdate = {};
+							const hash = asset.info.contenthash;
+							infoUpdate.contenthash = Array.isArray(hash)
+								? hash.map(hash => hashToNewHash.get(hash))
+								: hashToNewHash.get(hash);
+
+							if (asset.newSource !== undefined) {
+								compilation.updateAsset(
+									asset.name,
+									asset.newSource,
+									infoUpdate
+								);
+							} else {
+								compilation.updateAsset(asset.name, asset.source, infoUpdate);
+							}
+
+							if (asset.name !== newName) {
+								compilation.renameAsset(asset.name, newName);
+							}
+						})
+					);
+				}
+			);
+		});
+	}
+}
+
+module.exports = RealContentHashPlugin;

my-app/node_modules/webpack/lib/optimize/RemoveEmptyChunksPlugin.js

@@ -0,0 +1,57 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { STAGE_BASIC, STAGE_ADVANCED } = require("../OptimizationStages");
+
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../Compiler")} Compiler */
+
+class RemoveEmptyChunksPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap("RemoveEmptyChunksPlugin", compilation => {
+			/**
+			 * @param {Iterable<Chunk>} chunks the chunks array
+			 * @returns {void}
+			 */
+			const handler = chunks => {
+				const chunkGraph = compilation.chunkGraph;
+				for (const chunk of chunks) {
+					if (
+						chunkGraph.getNumberOfChunkModules(chunk) === 0 &&
+						!chunk.hasRuntime() &&
+						chunkGraph.getNumberOfEntryModules(chunk) === 0
+					) {
+						compilation.chunkGraph.disconnectChunk(chunk);
+						compilation.chunks.delete(chunk);
+					}
+				}
+			};
+
+			// TODO do it once
+			compilation.hooks.optimizeChunks.tap(
+				{
+					name: "RemoveEmptyChunksPlugin",
+					stage: STAGE_BASIC
+				},
+				handler
+			);
+			compilation.hooks.optimizeChunks.tap(
+				{
+					name: "RemoveEmptyChunksPlugin",
+					stage: STAGE_ADVANCED
+				},
+				handler
+			);
+		});
+	}
+}
+module.exports = RemoveEmptyChunksPlugin;

my-app/node_modules/webpack/lib/optimize/RemoveParentModulesPlugin.js

@@ -0,0 +1,127 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { STAGE_BASIC } = require("../OptimizationStages");
+const Queue = require("../util/Queue");
+const { intersect } = require("../util/SetHelpers");
+
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../ChunkGroup")} ChunkGroup */
+/** @typedef {import("../Compiler")} Compiler */
+
+class RemoveParentModulesPlugin {
+	/**
+	 * @param {Compiler} compiler the compiler
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap("RemoveParentModulesPlugin", compilation => {
+			/**
+			 * @param {Iterable<Chunk>} chunks the chunks
+			 * @param {ChunkGroup[]} chunkGroups the chunk groups
+			 */
+			const handler = (chunks, chunkGroups) => {
+				const chunkGraph = compilation.chunkGraph;
+				const queue = new Queue();
+				const availableModulesMap = new WeakMap();
+
+				for (const chunkGroup of compilation.entrypoints.values()) {
+					// initialize available modules for chunks without parents
+					availableModulesMap.set(chunkGroup, new Set());
+					for (const child of chunkGroup.childrenIterable) {
+						queue.enqueue(child);
+					}
+				}
+				for (const chunkGroup of compilation.asyncEntrypoints) {
+					// initialize available modules for chunks without parents
+					availableModulesMap.set(chunkGroup, new Set());
+					for (const child of chunkGroup.childrenIterable) {
+						queue.enqueue(child);
+					}
+				}
+
+				while (queue.length > 0) {
+					const chunkGroup = queue.dequeue();
+					let availableModules = availableModulesMap.get(chunkGroup);
+					let changed = false;
+					for (const parent of chunkGroup.parentsIterable) {
+						const availableModulesInParent = availableModulesMap.get(parent);
+						if (availableModulesInParent !== undefined) {
+							// If we know the available modules in parent: process these
+							if (availableModules === undefined) {
+								// if we have not own info yet: create new entry
+								availableModules = new Set(availableModulesInParent);
+								for (const chunk of parent.chunks) {
+									for (const m of chunkGraph.getChunkModulesIterable(chunk)) {
+										availableModules.add(m);
+									}
+								}
+								availableModulesMap.set(chunkGroup, availableModules);
+								changed = true;
+							} else {
+								for (const m of availableModules) {
+									if (
+										!chunkGraph.isModuleInChunkGroup(m, parent) &&
+										!availableModulesInParent.has(m)
+									) {
+										availableModules.delete(m);
+										changed = true;
+									}
+								}
+							}
+						}
+					}
+					if (changed) {
+						// if something changed: enqueue our children
+						for (const child of chunkGroup.childrenIterable) {
+							queue.enqueue(child);
+						}
+					}
+				}
+
+				// now we have available modules for every chunk
+				for (const chunk of chunks) {
+					const availableModulesSets = Array.from(
+						chunk.groupsIterable,
+						chunkGroup => availableModulesMap.get(chunkGroup)
+					);
+					if (availableModulesSets.some(s => s === undefined)) continue; // No info about this chunk group
+					const availableModules =
+						availableModulesSets.length === 1
+							? availableModulesSets[0]
+							: intersect(availableModulesSets);
+					const numberOfModules = chunkGraph.getNumberOfChunkModules(chunk);
+					const toRemove = new Set();
+					if (numberOfModules < availableModules.size) {
+						for (const m of chunkGraph.getChunkModulesIterable(chunk)) {
+							if (availableModules.has(m)) {
+								toRemove.add(m);
+							}
+						}
+					} else {
+						for (const m of availableModules) {
+							if (chunkGraph.isModuleInChunk(m, chunk)) {
+								toRemove.add(m);
+							}
+						}
+					}
+					for (const module of toRemove) {
+						chunkGraph.disconnectChunkAndModule(chunk, module);
+					}
+				}
+			};
+			compilation.hooks.optimizeChunks.tap(
+				{
+					name: "RemoveParentModulesPlugin",
+					stage: STAGE_BASIC
+				},
+				handler
+			);
+		});
+	}
+}
+module.exports = RemoveParentModulesPlugin;

my-app/node_modules/webpack/lib/optimize/RuntimeChunkPlugin.js

@@ -0,0 +1,52 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("../Compilation").EntryData} EntryData */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Entrypoint")} Entrypoint */
+
+class RuntimeChunkPlugin {
+	constructor(options) {
+		this.options = {
+			/**
+			 * @param {Entrypoint} entrypoint entrypoint name
+			 * @returns {string} runtime chunk name
+			 */
+			name: entrypoint => `runtime~${entrypoint.name}`,
+			...options
+		};
+	}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.thisCompilation.tap("RuntimeChunkPlugin", compilation => {
+			compilation.hooks.addEntry.tap(
+				"RuntimeChunkPlugin",
+				(_, { name: entryName }) => {
+					if (entryName === undefined) return;
+					const data =
+						/** @type {EntryData} */
+						(compilation.entries.get(entryName));
+					if (data.options.runtime === undefined && !data.options.dependOn) {
+						// Determine runtime chunk name
+						let name = this.options.name;
+						if (typeof name === "function") {
+							name = name({ name: entryName });
+						}
+						data.options.runtime = name;
+					}
+				}
+			);
+		});
+	}
+}
+
+module.exports = RuntimeChunkPlugin;

my-app/node_modules/webpack/lib/optimize/SideEffectsFlagPlugin.js

@@ -0,0 +1,346 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const glob2regexp = require("glob-to-regexp");
+const {
+	JAVASCRIPT_MODULE_TYPE_AUTO,
+	JAVASCRIPT_MODULE_TYPE_ESM,
+	JAVASCRIPT_MODULE_TYPE_DYNAMIC
+} = require("../ModuleTypeConstants");
+const { STAGE_DEFAULT } = require("../OptimizationStages");
+const HarmonyExportImportedSpecifierDependency = require("../dependencies/HarmonyExportImportedSpecifierDependency");
+const HarmonyImportSpecifierDependency = require("../dependencies/HarmonyImportSpecifierDependency");
+const formatLocation = require("../formatLocation");
+
+/** @typedef {import("estree").ModuleDeclaration} ModuleDeclaration */
+/** @typedef {import("estree").Statement} Statement */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Dependency")} Dependency */
+/** @typedef {import("../Module")} Module */
+/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
+
+/**
+ * @typedef {Object} ExportInModule
+ * @property {Module} module the module
+ * @property {string} exportName the name of the export
+ * @property {boolean} checked if the export is conditional
+ */
+
+/**
+ * @typedef {Object} ReexportInfo
+ * @property {Map<string, ExportInModule[]>} static
+ * @property {Map<Module, Set<string>>} dynamic
+ */
+
+/** @type {WeakMap<any, Map<string, RegExp>>} */
+const globToRegexpCache = new WeakMap();
+
+/**
+ * @param {string} glob the pattern
+ * @param {Map<string, RegExp>} cache the glob to RegExp cache
+ * @returns {RegExp} a regular expression
+ */
+const globToRegexp = (glob, cache) => {
+	const cacheEntry = cache.get(glob);
+	if (cacheEntry !== undefined) return cacheEntry;
+	if (!glob.includes("/")) {
+		glob = `**/${glob}`;
+	}
+	const baseRegexp = glob2regexp(glob, { globstar: true, extended: true });
+	const regexpSource = baseRegexp.source;
+	const regexp = new RegExp("^(\\./)?" + regexpSource.slice(1));
+	cache.set(glob, regexp);
+	return regexp;
+};
+
+const PLUGIN_NAME = "SideEffectsFlagPlugin";
+
+class SideEffectsFlagPlugin {
+	/**
+	 * @param {boolean} analyseSource analyse source code for side effects
+	 */
+	constructor(analyseSource = true) {
+		this._analyseSource = analyseSource;
+	}
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		let cache = globToRegexpCache.get(compiler.root);
+		if (cache === undefined) {
+			cache = new Map();
+			globToRegexpCache.set(compiler.root, cache);
+		}
+		compiler.hooks.compilation.tap(
+			PLUGIN_NAME,
+			(compilation, { normalModuleFactory }) => {
+				const moduleGraph = compilation.moduleGraph;
+				normalModuleFactory.hooks.module.tap(PLUGIN_NAME, (module, data) => {
+					const resolveData = data.resourceResolveData;
+					if (
+						resolveData &&
+						resolveData.descriptionFileData &&
+						resolveData.relativePath
+					) {
+						const sideEffects = resolveData.descriptionFileData.sideEffects;
+						if (sideEffects !== undefined) {
+							if (module.factoryMeta === undefined) {
+								module.factoryMeta = {};
+							}
+							const hasSideEffects = SideEffectsFlagPlugin.moduleHasSideEffects(
+								resolveData.relativePath,
+								sideEffects,
+								cache
+							);
+							module.factoryMeta.sideEffectFree = !hasSideEffects;
+						}
+					}
+
+					return module;
+				});
+				normalModuleFactory.hooks.module.tap(PLUGIN_NAME, (module, data) => {
+					if (typeof data.settings.sideEffects === "boolean") {
+						if (module.factoryMeta === undefined) {
+							module.factoryMeta = {};
+						}
+						module.factoryMeta.sideEffectFree = !data.settings.sideEffects;
+					}
+					return module;
+				});
+				if (this._analyseSource) {
+					/**
+					 * @param {JavascriptParser} parser the parser
+					 * @returns {void}
+					 */
+					const parserHandler = parser => {
+						/** @type {undefined | Statement | ModuleDeclaration} */
+						let sideEffectsStatement;
+						parser.hooks.program.tap(PLUGIN_NAME, () => {
+							sideEffectsStatement = undefined;
+						});
+						parser.hooks.statement.tap(
+							{ name: PLUGIN_NAME, stage: -100 },
+							statement => {
+								if (sideEffectsStatement) return;
+								if (parser.scope.topLevelScope !== true) return;
+								switch (statement.type) {
+									case "ExpressionStatement":
+										if (
+											!parser.isPure(statement.expression, statement.range[0])
+										) {
+											sideEffectsStatement = statement;
+										}
+										break;
+									case "IfStatement":
+									case "WhileStatement":
+									case "DoWhileStatement":
+										if (!parser.isPure(statement.test, statement.range[0])) {
+											sideEffectsStatement = statement;
+										}
+										// statement hook will be called for child statements too
+										break;
+									case "ForStatement":
+										if (
+											!parser.isPure(statement.init, statement.range[0]) ||
+											!parser.isPure(
+												statement.test,
+												statement.init
+													? statement.init.range[1]
+													: statement.range[0]
+											) ||
+											!parser.isPure(
+												statement.update,
+												statement.test
+													? statement.test.range[1]
+													: statement.init
+													? statement.init.range[1]
+													: statement.range[0]
+											)
+										) {
+											sideEffectsStatement = statement;
+										}
+										// statement hook will be called for child statements too
+										break;
+									case "SwitchStatement":
+										if (
+											!parser.isPure(statement.discriminant, statement.range[0])
+										) {
+											sideEffectsStatement = statement;
+										}
+										// statement hook will be called for child statements too
+										break;
+									case "VariableDeclaration":
+									case "ClassDeclaration":
+									case "FunctionDeclaration":
+										if (!parser.isPure(statement, statement.range[0])) {
+											sideEffectsStatement = statement;
+										}
+										break;
+									case "ExportNamedDeclaration":
+									case "ExportDefaultDeclaration":
+										if (
+											!parser.isPure(statement.declaration, statement.range[0])
+										) {
+											sideEffectsStatement = statement;
+										}
+										break;
+									case "LabeledStatement":
+									case "BlockStatement":
+										// statement hook will be called for child statements too
+										break;
+									case "EmptyStatement":
+										break;
+									case "ExportAllDeclaration":
+									case "ImportDeclaration":
+										// imports will be handled by the dependencies
+										break;
+									default:
+										sideEffectsStatement = statement;
+										break;
+								}
+							}
+						);
+						parser.hooks.finish.tap(PLUGIN_NAME, () => {
+							if (sideEffectsStatement === undefined) {
+								parser.state.module.buildMeta.sideEffectFree = true;
+							} else {
+								const { loc, type } = sideEffectsStatement;
+								moduleGraph
+									.getOptimizationBailout(parser.state.module)
+									.push(
+										() =>
+											`Statement (${type}) with side effects in source code at ${formatLocation(
+												loc
+											)}`
+									);
+							}
+						});
+					};
+					for (const key of [
+						JAVASCRIPT_MODULE_TYPE_AUTO,
+						JAVASCRIPT_MODULE_TYPE_ESM,
+						JAVASCRIPT_MODULE_TYPE_DYNAMIC
+					]) {
+						normalModuleFactory.hooks.parser
+							.for(key)
+							.tap(PLUGIN_NAME, parserHandler);
+					}
+				}
+				compilation.hooks.optimizeDependencies.tap(
+					{
+						name: PLUGIN_NAME,
+						stage: STAGE_DEFAULT
+					},
+					modules => {
+						const logger = compilation.getLogger(
+							"webpack.SideEffectsFlagPlugin"
+						);
+
+						logger.time("update dependencies");
+						for (const module of modules) {
+							if (module.getSideEffectsConnectionState(moduleGraph) === false) {
+								const exportsInfo = moduleGraph.getExportsInfo(module);
+								for (const connection of moduleGraph.getIncomingConnections(
+									module
+								)) {
+									const dep = connection.dependency;
+									let isReexport;
+									if (
+										(isReexport =
+											dep instanceof
+											HarmonyExportImportedSpecifierDependency) ||
+										(dep instanceof HarmonyImportSpecifierDependency &&
+											!dep.namespaceObjectAsContext)
+									) {
+										// TODO improve for export *
+										if (isReexport && dep.name) {
+											const exportInfo = moduleGraph.getExportInfo(
+												/** @type {Module} */ (connection.originModule),
+												dep.name
+											);
+											exportInfo.moveTarget(
+												moduleGraph,
+												({ module }) =>
+													module.getSideEffectsConnectionState(moduleGraph) ===
+													false,
+												({ module: newModule, export: exportName }) => {
+													moduleGraph.updateModule(dep, newModule);
+													moduleGraph.addExplanation(
+														dep,
+														"(skipped side-effect-free modules)"
+													);
+													const ids = dep.getIds(moduleGraph);
+													dep.setIds(
+														moduleGraph,
+														exportName
+															? [...exportName, ...ids.slice(1)]
+															: ids.slice(1)
+													);
+													return moduleGraph.getConnection(dep);
+												}
+											);
+											continue;
+										}
+										// TODO improve for nested imports
+										const ids = dep.getIds(moduleGraph);
+										if (ids.length > 0) {
+											const exportInfo = exportsInfo.getExportInfo(ids[0]);
+											const target = exportInfo.getTarget(
+												moduleGraph,
+												({ module }) =>
+													module.getSideEffectsConnectionState(moduleGraph) ===
+													false
+											);
+											if (!target) continue;
+
+											moduleGraph.updateModule(dep, target.module);
+											moduleGraph.addExplanation(
+												dep,
+												"(skipped side-effect-free modules)"
+											);
+											dep.setIds(
+												moduleGraph,
+												target.export
+													? [...target.export, ...ids.slice(1)]
+													: ids.slice(1)
+											);
+										}
+									}
+								}
+							}
+						}
+						logger.timeEnd("update dependencies");
+					}
+				);
+			}
+		);
+	}
+
+	/**
+	 * @param {string} moduleName the module name
+	 * @param {undefined | boolean | string | string[]} flagValue the flag value
+	 * @param {Map<string, RegExp>} cache cache for glob to regexp
+	 * @returns {boolean | undefined} true, when the module has side effects, undefined or false when not
+	 */
+	static moduleHasSideEffects(moduleName, flagValue, cache) {
+		switch (typeof flagValue) {
+			case "undefined":
+				return true;
+			case "boolean":
+				return flagValue;
+			case "string":
+				return globToRegexp(flagValue, cache).test(moduleName);
+			case "object":
+				return flagValue.some(glob =>
+					SideEffectsFlagPlugin.moduleHasSideEffects(moduleName, glob, cache)
+				);
+		}
+	}
+}
+module.exports = SideEffectsFlagPlugin;