style: improve style of code

eslint.config.js

@@ -112,6 +112,7 @@ module.exports = [
 			"object-shorthand": "error",
 			"no-else-return": "error",
 			"no-lonely-if": "error",
+			"no-undef-init": "error",
 			"n/no-missing-require": ["error", { allowModules: ["webpack"] }],
 			"n/no-unsupported-features/node-builtins": [
 				"error",
@@ -182,6 +183,7 @@ module.exports = [
 		rules: {
 			"prefer-const": "off",
 			"object-shorthand": "off",
+			"no-undef-init": "off",
 			"n/exports-style": "off"
 		}
 	},
@@ -231,5 +233,11 @@ module.exports = [
 		rules: {
 			"n/no-missing-require": "off"
 		}
+	},
+	{
+		files: ["lib/util/semver.js"],
+		rules: {
+			"n/exports-style": "off"
+		}
 	}
 ];

lib/CleanPlugin.js

@@ -7,7 +7,7 @@
 
 const asyncLib = require("neo-async");
 const { SyncBailHook } = require("tapable");
-const Compilation = require("../lib/Compilation");
+const Compilation = require("./Compilation");
 const createSchemaValidation = require("./util/create-schema-validation");
 const { join } = require("./util/fs");
 const processAsyncTree = require("./util/processAsyncTree");

lib/Compilation.js

@@ -448,7 +448,7 @@ class Compilation {
 		 * @returns {CompilationAssets} new assets
 		 */
 		const popNewAssets = assets => {
-			let newAssets = undefined;
+			let newAssets;
 			for (const file of Object.keys(assets)) {
 				if (savedAssets.has(file)) continue;
 				if (newAssets === undefined) {
@@ -1960,7 +1960,7 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 		callback
 	) {
 		// Check for cycles when build is trigger inside another build
-		let creatingModuleDuringBuildSet = undefined;
+		let creatingModuleDuringBuildSet;
 		if (checkCycle && this.buildQueue.isProcessing(originModule)) {
 			// Track build dependency
 			creatingModuleDuringBuildSet =
@@ -2361,7 +2361,7 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 		 */
 		const computeReferences = module => {
 			/** @type {References | undefined} */
-			let references = undefined;
+			let references;
 			for (const connection of moduleGraph.getOutgoingConnections(module)) {
 				const d = connection.dependency;
 				const m = connection.module;
@@ -2530,9 +2530,9 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 		const computeReferences = module => {
 			const id = chunkGraph.getModuleId(module);
 			/** @type {Map<Module, string | number | undefined> | undefined} */
-			let modules = undefined;
+			let modules;
 			/** @type {(string | number | null)[] | undefined} */
-			let blocks = undefined;
+			let blocks;
 			const outgoing = moduleGraph.getOutgoingConnectionsByModule(module);
 			if (outgoing !== undefined) {
 				for (const m of outgoing.keys()) {
@@ -3328,7 +3328,7 @@ Or do you want to use the entrypoints '${name}' and '${runtime}' independently o
 		/** @type {WebpackError[]} */
 		const errors = [];
 		/** @type {NotCodeGeneratedModules | undefined} */
-		let notCodeGeneratedModules = undefined;
+		let notCodeGeneratedModules;
 		const runIteration = () => {
 			/** @type {CodeGenerationJobs} */
 			let delayedJobs = [];

lib/Compiler.js

@@ -14,7 +14,7 @@ const {
 	AsyncSeriesHook
 } = require("tapable");
 const { SizeOnlySource } = require("webpack-sources");
-const webpack = require("./");
+const webpack = require(".");
 const Cache = require("./Cache");
 const CacheFacade = require("./CacheFacade");
 const ChunkGraph = require("./ChunkGraph");

lib/ExternalModule.js

@@ -846,7 +846,7 @@ class ExternalModule extends Module {
 				if (sourceData.init)
 					sourceString = `${sourceData.init}\n${sourceString}`;
 
-				let data = undefined;
+				let data;
 				if (sourceData.chunkInitFragments) {
 					data = new Map();
 					data.set("chunkInitFragments", sourceData.chunkInitFragments);

lib/FileSystemInfo.js

@@ -573,7 +573,7 @@ class SnapshotOptimization {
 		};
 
 		/** @type {SnapshotOptimizationEntry | undefined} */
-		let newOptimizationEntry = undefined;
+		let newOptimizationEntry;
 
 		const capturedFilesSize = capturedFiles.size;
 
@@ -2501,7 +2501,7 @@ class FileSystemInfo {
 	 */
 	_checkSnapshotValidNoCache(snapshot, callback) {
 		/** @type {number | undefined} */
-		let startTime = undefined;
+		let startTime;
 		if (snapshot.hasStartTime()) {
 			startTime = snapshot.startTime;
 		}
@@ -3181,7 +3181,7 @@ class FileSystemInfo {
 					});
 				},
 				reduce: (files, tsEntries) => {
-					let symlinks = undefined;
+					let symlinks;
 
 					const hash = createHash(this._hashFunction);
 
@@ -3306,7 +3306,7 @@ class FileSystemInfo {
 				 * @returns {ContextHash} reduced hash
 				 */
 				reduce: (files, fileHashes) => {
-					let symlinks = undefined;
+					let symlinks;
 					const hash = createHash(this._hashFunction);
 
 					for (const file of files) hash.update(file);
@@ -3437,7 +3437,7 @@ class FileSystemInfo {
 					 * @returns {ContextTimestampAndHash} tsh
 					 */
 					reduce: (files, results) => {
-						let symlinks = undefined;
+						let symlinks;
 
 						const tsHash = createHash(this._hashFunction);
 						const hash = createHash(this._hashFunction);

lib/FlagAllModulesAsUsedPlugin.js

@@ -30,7 +30,7 @@ class FlagAllModulesAsUsedPlugin {
 			const moduleGraph = compilation.moduleGraph;
 			compilation.hooks.optimizeDependencies.tap(PLUGIN_NAME, modules => {
 				/** @type {RuntimeSpec} */
-				let runtime = undefined;
+				let runtime;
 				for (const [name, { options }] of compilation.entries) {
 					runtime = mergeRuntimeOwned(
 						runtime,

lib/FlagDependencyExportsPlugin.js

@@ -189,9 +189,9 @@ class FlagDependencyExportsPlugin {
 											let name;
 											let canMangle = globalCanMangle;
 											let terminalBinding = globalTerminalBinding;
-											let exports = undefined;
+											let exports;
 											let from = globalFrom;
-											let fromExport = undefined;
+											let fromExport;
 											let priority = globalPriority;
 											let hidden = false;
 											if (typeof exportNameOrSpec === "string") {
@@ -261,7 +261,7 @@ class FlagDependencyExportsPlugin {
 
 											// Recalculate target exportsInfo
 											const target = exportInfo.getTarget(moduleGraph);
-											let targetExportsInfo = undefined;
+											let targetExportsInfo;
 											if (target) {
 												const targetModuleExportsInfo =
 													moduleGraph.getExportsInfo(target.module);

lib/FlagDependencyUsagePlugin.js

@@ -308,7 +308,7 @@ class FlagDependencyUsagePlugin {
 						}
 					};
 					/** @type {RuntimeSpec} */
-					let globalRuntime = undefined;
+					let globalRuntime;
 					for (const [
 						entryName,
 						{ dependencies: deps, includeDependencies: includeDeps, options }

lib/ModuleBuildError.js

@@ -19,7 +19,7 @@ class ModuleBuildError extends WebpackError {
 	 */
 	constructor(err, { from = null } = {}) {
 		let message = "Module build failed";
-		let details = undefined;
+		let details;
 
 		if (from) {
 			message += ` (from ${from}):\n`;

lib/ModuleGraph.js

@@ -36,7 +36,7 @@ const getConnectionsByOriginModule = set => {
 	/** @type {Module | 0} */
 	let lastModule = 0;
 	/** @type {ModuleGraphConnection[] | undefined} */
-	let lastList = undefined;
+	let lastList;
 	for (const connection of set) {
 		const { originModule } = connection;
 		if (lastModule === originModule) {
@@ -67,7 +67,7 @@ const getConnectionsByModule = set => {
 	/** @type {Module | 0} */
 	let lastModule = 0;
 	/** @type {ModuleGraphConnection[] | undefined} */
-	let lastList = undefined;
+	let lastList;
 	for (const connection of set) {
 		const { module } = connection;
 		if (lastModule === module) {

lib/ModuleParseError.js

@@ -22,7 +22,7 @@ class ModuleParseError extends WebpackError {
 	 */
 	constructor(source, err, loaders, type) {
 		let message = "Module parse failed: " + (err && err.message);
-		let loc = undefined;
+		let loc;
 
 		if (
 			((Buffer.isBuffer(source) && source.slice(0, 4).equals(WASM_HEADER)) ||

lib/NormalModule.js

@@ -1138,7 +1138,7 @@ class NormalModule extends Module {
 				// add warning for all non-absolute paths in fileDependencies, etc
 				// This makes it easier to find problems with watching and/or caching
 				/** @type {undefined | Set<string>} */
-				let nonAbsoluteDependencies = undefined;
+				let nonAbsoluteDependencies;
 				/**
 				 * @param {LazySet<string>} deps deps
 				 */

lib/NormalModuleFactory.js

@@ -426,7 +426,7 @@ class NormalModuleFactory extends ModuleFactory {
 				const loaderResolver = this.getResolver("loader");
 
 				/** @type {ResourceData | undefined} */
-				let matchResourceData = undefined;
+				let matchResourceData;
 				/** @type {string} */
 				let unresolvedResource;
 				/** @type {ParsedLoaderRequest[]} */

lib/Watching.js

@@ -255,7 +255,7 @@ class Watching {
 			(compilation && compilation.getLogger("webpack.Watching"));
 
 		/** @type {Stats | undefined} */
-		let stats = undefined;
+		let stats;
 
 		/**
 		 * @param {Error} err error

lib/asset/AssetModulesPlugin.js

@@ -137,7 +137,7 @@ class AssetModulesPlugin {
 						.tap(plugin, generatorOptions => {
 							validateGeneratorOptions[type](generatorOptions);
 
-							let dataUrl = undefined;
+							let dataUrl;
 							if (type !== ASSET_MODULE_TYPE_RESOURCE) {
 								dataUrl = generatorOptions.dataUrl;
 								if (!dataUrl || typeof dataUrl === "object") {
@@ -149,9 +149,9 @@ class AssetModulesPlugin {
 								}
 							}
 
-							let filename = undefined;
+							let filename;
-							let publicPath = undefined;
+							let publicPath;
-							let outputPath = undefined;
+							let outputPath;
 							if (type !== ASSET_MODULE_TYPE_INLINE) {
 								filename = generatorOptions.filename;
 								publicPath = generatorOptions.publicPath;

lib/cache/IdleFileCachePlugin.js

@@ -175,7 +175,7 @@ class IdleFileCachePlugin {
 			}
 		};
 		/** @type {ReturnType<typeof setTimeout> | undefined} */
-		let idleTimer = undefined;
+		let idleTimer;
 		compiler.cache.hooks.beginIdle.tap(
 			{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
 			() => {

lib/cache/PackFileCacheStrategy.js

@@ -527,7 +527,7 @@ class Pack {
 	 */
 	_gcOldestContent() {
 		/** @type {PackItemInfo | undefined} */
-		let oldest = undefined;
+		let oldest;
 		for (const info of this.itemInfo.values()) {
 			if (oldest === undefined || info.lastAccess < oldest.lastAccess) {
 				oldest = info;

lib/config/defaults.js

@@ -124,7 +124,7 @@ const A = (obj, prop, factory) => {
 		obj[prop] = factory();
 	} else if (Array.isArray(value)) {
 		/** @type {any[] | undefined} */
-		let newArray = undefined;
+		let newArray;
 		for (let i = 0; i < value.length; i++) {
 			const item = value[i];
 			if (item === "...") {

lib/css/CssModulesPlugin.js

@@ -508,7 +508,7 @@ class CssModulesPlugin {
 			}
 			/** @type {Module} */
 			let selectedModule = list[list.length - 1];
-			let hasFailed = undefined;
+			let hasFailed;
 			outer: for (;;) {
 				for (const { list, set } of modulesByChunkGroup) {
 					if (list.length === 0) continue;

lib/css/CssParser.js

@@ -201,13 +201,13 @@ class CssParser extends Parser {
 		/** @type {boolean} */
 		let allowImportAtRule = true;
 		/** @type {"local" | "global" | undefined} */
-		let modeData = undefined;
+		let modeData;
 		/** @type {[number, number] | undefined} */
-		let lastIdentifier = undefined;
+		let lastIdentifier;
 		/** @type [string, number, number][] */
 		const balanced = [];
 		/** @type {undefined | { start: number, url?: string, urlStart?: number, urlEnd?: number, layer?: string, layerStart?: number, layerEnd?: number, supports?: string, supportsStart?: number, supportsEnd?: number, inSupports?:boolean, media?: string  }} */
-		let importData = undefined;
+		let importData;
 		/** @type {boolean} */
 		let inAnimationProperty = false;
 		/** @type {boolean} */

lib/debug/ProfilingPlugin.js

@@ -36,7 +36,7 @@ const validate = createSchemaValidation(
 );
 
 /** @type {Inspector | undefined} */
-let inspector = undefined;
+let inspector;
 
 try {
 	// eslint-disable-next-line n/no-unsupported-features/node-builtins

lib/dependencies/CommonJsDependencyHelpers.js

@@ -22,7 +22,7 @@ module.exports.handleDependencyBase = (
 	module,
 	runtimeRequirements
 ) => {
-	let base = undefined;
+	let base;
 	let type;
 	switch (depBase) {
 		case "exports":

lib/dependencies/CommonJsSelfReferenceDependency.js

@@ -120,7 +120,7 @@ CommonJsSelfReferenceDependency.Template = class CommonJsSelfReferenceDependency
 			);
 		}
 
-		let base = undefined;
+		let base;
 		switch (dep.base) {
 			case "exports":
 				runtimeRequirements.add(RuntimeGlobals.exports);

lib/dependencies/HarmonyExportImportedSpecifierDependency.js

@@ -444,7 +444,7 @@ class HarmonyExportImportedSpecifierDependency extends HarmonyImportDependency {
 
 		const ignoredExports = new Set(["default", ...this.activeExports]);
 
-		let hiddenExports = undefined;
+		let hiddenExports;
 		const otherStarExports =
 			this._discoverActiveExportsFromOtherStarExports(moduleGraph);
 		if (otherStarExports !== undefined) {

lib/javascript/JavascriptParser.js

@@ -1210,9 +1210,9 @@ class JavascriptParser extends Parser {
 		 */
 		const tapEvaluateWithVariableInfo = (exprType, getInfo) => {
 			/** @type {Expression | undefined} */
-			let cachedExpression = undefined;
+			let cachedExpression;
 			/** @type {GetInfoResult | undefined} */
-			let cachedInfo = undefined;
+			let cachedInfo;
 			this.hooks.evaluate.for(exprType).tap("JavascriptParser", expr => {
 				const expression = /** @type {MemberExpression} */ (expr);
 

lib/javascript/StartupHelpers.js

@@ -71,8 +71,8 @@ module.exports.generateEntryStartup = (
 		}
 	};
 
-	let currentChunks = undefined;
+	let currentChunks;
-	let currentModuleIds = undefined;
+	let currentModuleIds;
 
 	for (const [module, entrypoint] of entries) {
 		const runtimeChunk =

lib/node/nodeConsole.js

@@ -19,7 +19,7 @@ const truncateArgs = require("../logging/truncateArgs");
  */
 module.exports = ({ colors, appendOnly, stream }) => {
 	/** @type {string[] | undefined} */
-	let currentStatusMessage = undefined;
+	let currentStatusMessage;
 	let hasStatusMessage = false;
 	let currentIndent = "";
 	let currentCollapsed = 0;

lib/optimize/FlagIncludedChunksPlugin.js

@@ -74,7 +74,7 @@ class FlagIncludedChunksPlugin {
 						const chunkAModulesCount =
 							chunkGraph.getNumberOfChunkModules(chunkA);
 						if (chunkAModulesCount === 0) continue;
-						let bestModule = undefined;
+						let bestModule;
 						for (const module of chunkGraph.getChunkModulesIterable(chunkA)) {
 							if (
 								bestModule === undefined ||

lib/optimize/ModuleConcatenationPlugin.js

@@ -278,7 +278,7 @@ class ModuleConcatenationPlugin {
 						// TODO reconsider that when it's only used in a different runtime
 						if (usedAsInner.has(currentRoot)) continue;
 
-						let chunkRuntime = undefined;
+						let chunkRuntime;
 						for (const r of chunkGraph.getModuleRuntimes(currentRoot)) {
 							chunkRuntime = mergeRuntimeOwned(chunkRuntime, r);
 						}
@@ -675,7 +675,7 @@ class ModuleConcatenationPlugin {
 				if (chunkGraph.getNumberOfModuleChunks(originModule) === 0) continue;
 
 				// We don't care for connections from other runtimes
-				let originRuntime = undefined;
+				let originRuntime;
 				for (const r of chunkGraph.getModuleRuntimes(originModule)) {
 					originRuntime = mergeRuntimeOwned(originRuntime, r);
 				}

lib/schemes/HttpUriPlugin.js

@@ -60,7 +60,7 @@ const proxyFetch = (request, proxy) => (url, options, callback) => {
 };
 
 /** @type {(() => void)[] | undefined} */
-let inProgressWrite = undefined;
+let inProgressWrite;
 
 const validate = createSchemaValidation(
 	require("../../schemas/plugins/schemes/HttpUriPlugin.check.js"),
@@ -239,11 +239,11 @@ class Lockfile {
 const cachedWithoutKey = fn => {
 	let inFlight = false;
 	/** @type {Error | undefined} */
-	let cachedError = undefined;
+	let cachedError;
 	/** @type {R | undefined} */
-	let cachedResult = undefined;
+	let cachedResult;
 	/** @type {(function(Error=, R=): void)[] | undefined} */
-	let cachedCallbacks = undefined;
+	let cachedCallbacks;
 	return callback => {
 		if (inFlight) {
 			if (cachedResult !== undefined) return callback(null, cachedResult);
@@ -481,7 +481,7 @@ class HttpUriPlugin {
 				);
 
 				/** @type {Map<string, LockfileEntry | "ignore" | "no-cache"> | undefined} */
-				let lockfileUpdates = undefined;
+				let lockfileUpdates;
 
 				/**
 				 * @param {Lockfile} lockfile lockfile instance

lib/serialization/FileMiddleware.js

@@ -105,7 +105,7 @@ const serialize = async (
 	/** @type {WeakMap<SerializeResult, function(): any | Promise<any>>} */
 	const resultToLazy = new WeakMap();
 	/** @type {Buffer[]} */
-	let lastBuffers = undefined;
+	let lastBuffers;
 	for (const item of await data) {
 		if (typeof item === "function") {
 			if (!SerializerMiddleware.isLazy(item))

lib/stats/DefaultStatsFactoryPlugin.js

@@ -589,7 +589,7 @@ const SIMPLE_EXTRACTORS = {
 							if (depthInCollapsedGroup > 0) depthInCollapsedGroup--;
 							continue;
 						}
-						let message = undefined;
+						let message;
 						if (entry.type === LogType.time) {
 							message = `${entry.args[0]}: ${
 								entry.args[1] * 1000 + entry.args[2] / 1000000
@@ -1689,9 +1689,9 @@ const spaceLimited = (
 		};
 	}
 	/** @type {any[] | undefined} */
-	let children = undefined;
+	let children;
 	/** @type {number | undefined} */
-	let filteredChildren = undefined;
+	let filteredChildren;
 	// This are the groups, which take 1+ lines each
 	const groups = [];
 	// The sizes of the groups are stored in groupSizes

lib/util/ParallelismFactorCalculator.js

@@ -5,7 +5,7 @@
 
 "use strict";
 
-const binarySearchBounds = require("../util/binarySearchBounds");
+const binarySearchBounds = require("./binarySearchBounds");
 
 /** @typedef {function(number): void} Callback */
 

lib/util/TupleSet.js

@@ -103,7 +103,7 @@ class TupleSet {
 	[Symbol.iterator]() {
 		const iteratorStack = [];
 		const tuple = [];
-		let currentSetIterator = undefined;
+		let currentSetIterator;
 
 		const next = it => {
 			const result = it.next();

lib/util/createHash.js

@@ -133,13 +133,13 @@ class DebugHash extends Hash {
 }
 
 /** @type {typeof import("crypto") | undefined} */
-let crypto = undefined;
+let crypto;
 /** @type {typeof import("./hash/xxhash64") | undefined} */
-let createXXHash64 = undefined;
+let createXXHash64;
 /** @type {typeof import("./hash/md4") | undefined} */
-let createMd4 = undefined;
+let createMd4;
 /** @type {typeof import("./hash/BatchedHash") | undefined} */
-let BatchedHash = undefined;
+let BatchedHash;
 
 /**
  * Creates a hash by name or function

lib/util/deterministicGrouping.js

@@ -259,7 +259,7 @@ const getSimilarities = nodes => {
 	// calculate similarities between lexically adjacent nodes
 	/** @type {number[]} */
 	const similarities = [];
-	let last = undefined;
+	let last;
 	for (const node of nodes) {
 		if (last !== undefined) {
 			similarities.push(similarity(last.key, node.key));

lib/util/memoize.js

@@ -14,7 +14,7 @@
 const memoize = fn => {
 	let cache = false;
 	/** @type {T | undefined} */
-	let result = undefined;
+	let result;
 	return () => {
 		if (cache) {
 			return /** @type {T} */ (result);

lib/util/propertyAccess.js

@@ -5,10 +5,7 @@
 
 "use strict";
 
-const {
+const { SAFE_IDENTIFIER, RESERVED_IDENTIFIER } = require("./propertyName");
-	SAFE_IDENTIFIER,
-	RESERVED_IDENTIFIER
-} = require("../util/propertyName");
 
 /**
  * @param {ArrayLike<string>} properties properties

lib/util/runtime.js

@@ -31,7 +31,7 @@ module.exports.getEntryRuntime = (compilation, name, options) => {
 	}
 	if (dependOn) {
 		/** @type {RuntimeSpec} */
-		let result = undefined;
+		let result;
 		const queue = new Set(dependOn);
 		for (const name of queue) {
 			const dep = compilation.entries.get(name);
@@ -396,7 +396,7 @@ module.exports.filterRuntime = (runtime, filter) => {
 	if (typeof runtime === "string") return filter(runtime);
 	let some = false;
 	let every = true;
-	let result = undefined;
+	let result;
 	for (const r of runtime) {
 		const v = filter(r);
 		if (v) {

lib/util/semver.js

@@ -452,19 +452,15 @@ module.exports.stringifyHoley = json => {
 };
 
 //#region runtime code: parseVersion
-module.exports.parseVersionRuntimeCode = runtimeTemplate =>
+exports.parseVersionRuntimeCode = runtimeTemplate =>
 	`var parseVersion = ${runtimeTemplate.basicFunction("str", [
 		"// see webpack/lib/util/semver.js for original code",
-		`var p=${
+		`var p=${runtimeTemplate.supportsArrowFunction() ? "p=>" : "function(p)"}{return p.split(".").map((${runtimeTemplate.supportsArrowFunction() ? "p=>" : "function(p)"}{return+p==p?+p:p}))},n=/^([^-+]+)?(?:-([^+]+))?(?:\\+(.+))?$/.exec(str),r=n[1]?p(n[1]):[];return n[2]&&(r.length++,r.push.apply(r,p(n[2]))),n[3]&&(r.push([]),r.push.apply(r,p(n[3]))),r;`
-			runtimeTemplate.supportsArrowFunction() ? "p=>" : "function(p)"
-		}{return p.split(".").map((${
-			runtimeTemplate.supportsArrowFunction() ? "p=>" : "function(p)"
-		}{return+p==p?+p:p}))},n=/^([^-+]+)?(?:-([^+]+))?(?:\\+(.+))?$/.exec(str),r=n[1]?p(n[1]):[];return n[2]&&(r.length++,r.push.apply(r,p(n[2]))),n[3]&&(r.push([]),r.push.apply(r,p(n[3]))),r;`
 	])}`;
 //#endregion
 
 //#region runtime code: versionLt
-module.exports.versionLtRuntimeCode = runtimeTemplate =>
+exports.versionLtRuntimeCode = runtimeTemplate =>
 	`var versionLt = ${runtimeTemplate.basicFunction("a, b", [
 		"// see webpack/lib/util/semver.js for original code",
 		'a=parseVersion(a),b=parseVersion(b);for(var r=0;;){if(r>=a.length)return r<b.length&&"u"!=(typeof b[r])[0];var e=a[r],n=(typeof e)[0];if(r>=b.length)return"u"==n;var t=b[r],f=(typeof t)[0];if(n!=f)return"o"==n&&"n"==f||("s"==f||"u"==n);if("o"!=n&&"u"!=n&&e!=t)return e<t;r++}'
@@ -472,7 +468,7 @@ module.exports.versionLtRuntimeCode = runtimeTemplate =>
 //#endregion
 
 //#region runtime code: rangeToString
-module.exports.rangeToStringRuntimeCode = runtimeTemplate =>
+exports.rangeToStringRuntimeCode = runtimeTemplate =>
 	`var rangeToString = ${runtimeTemplate.basicFunction("range", [
 		"// see webpack/lib/util/semver.js for original code",
 		'var r=range[0],n="";if(1===range.length)return"*";if(r+.5){n+=0==r?">=":-1==r?"<":1==r?"^":2==r?"~":r>0?"=":"!=";for(var e=1,a=1;a<range.length;a++){e--,n+="u"==(typeof(t=range[a]))[0]?"-":(e>0?".":"")+(e=2,t)}return n}var g=[];for(a=1;a<range.length;a++){var t=range[a];g.push(0===t?"not("+o()+")":1===t?"("+o()+" || "+o()+")":2===t?g.pop()+" "+g.pop():rangeToString(t))}return o();function o(){return g.pop().replace(/^\\((.+)\\)$/,"$1")}'
@@ -480,7 +476,7 @@ module.exports.rangeToStringRuntimeCode = runtimeTemplate =>
 //#endregion
 
 //#region runtime code: satisfy
-module.exports.satisfyRuntimeCode = runtimeTemplate =>
+exports.satisfyRuntimeCode = runtimeTemplate =>
 	`var satisfy = ${runtimeTemplate.basicFunction("range, version", [
 		"// see webpack/lib/util/semver.js for original code",
 		'if(0 in range){version=parseVersion(version);var e=range[0],r=e<0;r&&(e=-e-1);for(var n=0,i=1,a=!0;;i++,n++){var f,s,g=i<range.length?(typeof range[i])[0]:"";if(n>=version.length||"o"==(s=(typeof(f=version[n]))[0]))return!a||("u"==g?i>e&&!r:""==g!=r);if("u"==s){if(!a||"u"!=g)return!1}else if(a)if(g==s)if(i<=e){if(f!=range[i])return!1}else{if(r?f>range[i]:f<range[i])return!1;f!=range[i]&&(a=!1)}else if("s"!=g&&"n"!=g){if(r||i<=e)return!1;a=!1,i--}else{if(i<=e||s<g!=r)return!1;a=!1}else"s"!=g&&"n"!=g&&(a=!1,i--)}}var t=[],o=t.pop.bind(t);for(n=1;n<range.length;n++){var u=range[n];t.push(1==u?o()|o():2==u?o()&o():u?satisfy(u,version):!o())}return!!o();'

lib/util/smartGrouping.js

@@ -111,10 +111,10 @@ const smartGrouping = (items, groupConfigs) => {
 		const results = [];
 		for (;;) {
 			/** @type {Group<T, R> | undefined} */
-			let bestGroup = undefined;
+			let bestGroup;
 			let bestGroupSize = -1;
-			let bestGroupItems = undefined;
+			let bestGroupItems;
-			let bestGroupOptions = undefined;
+			let bestGroupOptions;
 			for (const [group, state] of groupMap) {
 				const { items, used } = state;
 				let options = state.options;

test/helpers/FakeDocument.js

@@ -187,7 +187,7 @@ class FakeSheet {
 		const walkCssTokens = require("../../lib/css/walkCssTokens");
 		const rules = [];
 		let currentRule = { getPropertyValue };
-		let selector = undefined;
+		let selector;
 		let last = 0;
 		const processDeclaration = str => {
 			const colon = str.indexOf(":");

test/helpers/deprecationTracking.js

@@ -7,7 +7,7 @@
 
 const util = require("util");
 
-let interception = undefined;
+let interception;
 
 const originalDeprecate = util.deprecate;
 util.deprecate = (fn, message, code) => {