webpack/lib/config/defaults.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

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

"use strict";

const fs = require("fs");
const path = require("path");
const {
	CSS_TYPE,
	JAVASCRIPT_TYPE,
	UNKNOWN_TYPE
} = require("../ModuleSourceTypeConstants");
const {
	ASSET_MODULE_TYPE,
	ASSET_MODULE_TYPE_BYTES,
	ASSET_MODULE_TYPE_INLINE,
	ASSET_MODULE_TYPE_RESOURCE,
	ASSET_MODULE_TYPE_SOURCE,
	CSS_MODULE_TYPE,
	CSS_MODULE_TYPE_AUTO,
	CSS_MODULE_TYPE_GLOBAL,
	CSS_MODULE_TYPE_MODULE,
	JAVASCRIPT_MODULE_TYPE_AUTO,
	JAVASCRIPT_MODULE_TYPE_DYNAMIC,
	JAVASCRIPT_MODULE_TYPE_ESM,
	JSON_MODULE_TYPE,
	WEBASSEMBLY_MODULE_TYPE_ASYNC,
	WEBASSEMBLY_MODULE_TYPE_SYNC
} = require("../ModuleTypeConstants");
const Template = require("../Template");
const { cleverMerge } = require("../util/cleverMerge");
const {
	getDefaultTarget,
	getTargetProperties,
	getTargetsProperties
} = require("./target");

/** @typedef {import("../../declarations/WebpackOptions").CacheOptionsNormalized} CacheOptionsNormalized */
/** @typedef {import("../../declarations/WebpackOptions").Context} Context */
/** @typedef {import("../../declarations/WebpackOptions").DevTool} Devtool */
/** @typedef {import("../../declarations/WebpackOptions").CssGeneratorOptions} CssGeneratorOptions */
/** @typedef {import("../../declarations/WebpackOptions").EntryDescription} EntryDescription */
/** @typedef {import("../../declarations/WebpackOptions").EntryNormalized} Entry */
/** @typedef {import("../../declarations/WebpackOptions").Environment} Environment */
/** @typedef {import("../../declarations/WebpackOptions").Experiments} Experiments */
/** @typedef {import("../../declarations/WebpackOptions").ExperimentsNormalized} ExperimentsNormalized */
/** @typedef {import("../../declarations/WebpackOptions").ExternalsPresets} ExternalsPresets */
/** @typedef {import("../../declarations/WebpackOptions").ExternalsType} ExternalsType */
/** @typedef {import("../../declarations/WebpackOptions").FileCacheOptions} FileCacheOptions */
/** @typedef {import("../../declarations/WebpackOptions").GeneratorOptionsByModuleTypeKnown} GeneratorOptionsByModuleTypeKnown */
/** @typedef {import("../../declarations/WebpackOptions").InfrastructureLogging} InfrastructureLogging */
/** @typedef {import("../../declarations/WebpackOptions").JavascriptParserOptions} JavascriptParserOptions */
/** @typedef {import("../../declarations/WebpackOptions").JsonGeneratorOptions} JsonGeneratorOptions */
/** @typedef {import("../../declarations/WebpackOptions").Library} Library */
/** @typedef {import("../../declarations/WebpackOptions").LibraryName} LibraryName */
/** @typedef {import("../../declarations/WebpackOptions").LibraryType} LibraryType */
/** @typedef {import("../../declarations/WebpackOptions").Loader} Loader */
/** @typedef {import("../../declarations/WebpackOptions").Mode} Mode */
/** @typedef {import("../../declarations/WebpackOptions").HashFunction} HashFunction */
/** @typedef {import("../../declarations/WebpackOptions").HashSalt} HashSalt */
/** @typedef {import("../../declarations/WebpackOptions").HashDigest} HashDigest */
/** @typedef {import("../../declarations/WebpackOptions").HashDigestLength} HashDigestLength */
/** @typedef {import("../../declarations/WebpackOptions").ModuleOptionsNormalized} ModuleOptions */
/** @typedef {import("../../declarations/WebpackOptions").Node} WebpackNode */
/** @typedef {import("../../declarations/WebpackOptions").OptimizationNormalized} Optimization */
/** @typedef {import("../../declarations/WebpackOptions").OptimizationSplitChunksOptions} OptimizationSplitChunksOptions */
/** @typedef {import("../../declarations/WebpackOptions").OutputNormalized} Output */
/** @typedef {import("../../declarations/WebpackOptions").ParserOptionsByModuleTypeKnown} ParserOptionsByModuleTypeKnown */
/** @typedef {import("../../declarations/WebpackOptions").Performance} Performance */
/** @typedef {import("../../declarations/WebpackOptions").ResolveOptions} ResolveOptions */
/** @typedef {import("../../declarations/WebpackOptions").RuleSetRules} RuleSetRules */
/** @typedef {import("../../declarations/WebpackOptions").SnapshotOptions} SnapshotOptions */
/** @typedef {import("../../declarations/WebpackOptions").WebpackOptionsNormalized} WebpackOptionsNormalized */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../javascript/EnableChunkLoadingPlugin").ChunkLoadingTypes} ChunkLoadingTypes */
/** @typedef {import("../wasm/EnableWasmLoadingPlugin").WasmLoadingTypes} WasmLoadingTypes */
/** @typedef {import("./target").PlatformTargetProperties} PlatformTargetProperties */
/** @typedef {import("./target").TargetProperties} TargetProperties */

/**
 * Defines the recursive non nullable type used by this module.
 * @template T
 * @typedef {{ [P in keyof T]-?: T[P] extends object ? RecursiveNonNullable<NonNullable<T[P]>> : NonNullable<T[P]> }} RecursiveNonNullable
 */

/**
 * Defines the shared type used by this module.
 * @typedef {Output & {
 * uniqueName: NonNullable<Output["uniqueName"]>,
 * filename: NonNullable<Output["filename"]>,
 * cssFilename: NonNullable<Output["cssFilename"]>,
 * chunkFilename: NonNullable<Output["chunkFilename"]>,
 * cssChunkFilename: NonNullable<Output["cssChunkFilename"]>,
 * hotUpdateChunkFilename: NonNullable<Output["hotUpdateChunkFilename"]>,
 * hotUpdateGlobal: NonNullable<Output["hotUpdateGlobal"]>,
 * assetModuleFilename: NonNullable<Output["assetModuleFilename"]>,
 * webassemblyModuleFilename: NonNullable<Output["webassemblyModuleFilename"]>,
 * sourceMapFilename: NonNullable<Output["sourceMapFilename"]>,
 * hotUpdateMainFilename: NonNullable<Output["hotUpdateMainFilename"]>,
 * devtoolNamespace: NonNullable<Output["devtoolNamespace"]>,
 * publicPath: NonNullable<Output["publicPath"]>,
 * workerPublicPath: NonNullable<Output["workerPublicPath"]>,
 * workerWasmLoading: NonNullable<Output["workerWasmLoading"]>,
 * workerChunkLoading: NonNullable<Output["workerChunkLoading"]>,
 * chunkFormat: NonNullable<Output["chunkFormat"]>,
 * module: NonNullable<Output["module"]>,
 * asyncChunks: NonNullable<Output["asyncChunks"]>,
 * charset: NonNullable<Output["charset"]>,
 * iife: NonNullable<Output["iife"]>,
 * globalObject: NonNullable<Output["globalObject"]>,
 * scriptType: NonNullable<Output["scriptType"]>,
 * path: NonNullable<Output["path"]>,
 * pathinfo: NonNullable<Output["pathinfo"]>,
 * hashFunction: NonNullable<Output["hashFunction"]>,
 * hashDigest: NonNullable<Output["hashDigest"]>,
 * hashDigestLength: NonNullable<Output["hashDigestLength"]>,
 * chunkLoadTimeout: NonNullable<Output["chunkLoadTimeout"]>,
 * chunkLoading: NonNullable<Output["chunkLoading"]>,
 * chunkLoadingGlobal: NonNullable<Output["chunkLoadingGlobal"]>,
 * compareBeforeEmit: NonNullable<Output["compareBeforeEmit"]>,
 * strictModuleErrorHandling: NonNullable<Output["strictModuleErrorHandling"]>,
 * strictModuleExceptionHandling: NonNullable<Output["strictModuleExceptionHandling"]>,
 * importFunctionName: NonNullable<Output["importFunctionName"]>,
 * importMetaName: NonNullable<Output["importMetaName"]>,
 * environment: RecursiveNonNullable<Output["environment"]>,
 * crossOriginLoading: NonNullable<Output["crossOriginLoading"]>,
 * wasmLoading: NonNullable<Output["wasmLoading"]>,
 * }} OutputNormalizedWithDefaults
 */

/**
 * Defines the shared type used by this module.
 * @typedef {SnapshotOptions & {
 * managedPaths: NonNullable<SnapshotOptions["managedPaths"]>,
 * unmanagedPaths: NonNullable<SnapshotOptions["unmanagedPaths"]>,
 * immutablePaths: NonNullable<SnapshotOptions["immutablePaths"]>,
 * resolveBuildDependencies: NonNullable<SnapshotOptions["resolveBuildDependencies"]>,
 * buildDependencies: NonNullable<SnapshotOptions["buildDependencies"]>,
 * module: NonNullable<SnapshotOptions["module"]>,
 * resolve: NonNullable<SnapshotOptions["resolve"]>,
 * }} SnapshotNormalizedWithDefaults
 */

/**
 * Defines the shared type used by this module.
 * @typedef {Optimization & {
 * runtimeChunk: NonNullable<Optimization["runtimeChunk"]>,
 * splitChunks: NonNullable<Optimization["splitChunks"]>,
 * mergeDuplicateChunks: NonNullable<Optimization["mergeDuplicateChunks"]>,
 * removeAvailableModules: NonNullable<Optimization["removeAvailableModules"]>,
 * removeEmptyChunks: NonNullable<Optimization["removeEmptyChunks"]>,
 * flagIncludedChunks: NonNullable<Optimization["flagIncludedChunks"]>,
 * moduleIds: NonNullable<Optimization["moduleIds"]>,
 * chunkIds: NonNullable<Optimization["chunkIds"]>,
 * sideEffects: NonNullable<Optimization["sideEffects"]>,
 * providedExports: NonNullable<Optimization["providedExports"]>,
 * usedExports: NonNullable<Optimization["usedExports"]>,
 * mangleExports: NonNullable<Optimization["mangleExports"]>,
 * innerGraph: NonNullable<Optimization["innerGraph"]>,
 * concatenateModules: NonNullable<Optimization["concatenateModules"]>,
 * avoidEntryIife: NonNullable<Optimization["avoidEntryIife"]>,
 * emitOnErrors: NonNullable<Optimization["emitOnErrors"]>,
 * checkWasmTypes: NonNullable<Optimization["checkWasmTypes"]>,
 * mangleWasmImports: NonNullable<Optimization["mangleWasmImports"]>,
 * portableRecords: NonNullable<Optimization["portableRecords"]>,
 * realContentHash: NonNullable<Optimization["realContentHash"]>,
 * minimize: NonNullable<Optimization["minimize"]>,
 * minimizer: NonNullable<Exclude<Optimization["minimizer"], "...">>,
 * nodeEnv: NonNullable<Optimization["nodeEnv"]>,
 * }} OptimizationNormalizedWithDefaults
 */

/**
 * Defines the shared type used by this module.
 * @typedef {ExternalsPresets & {
 * web: NonNullable<ExternalsPresets["web"]>,
 * node: NonNullable<ExternalsPresets["node"]>,
 * nwjs: NonNullable<ExternalsPresets["nwjs"]>,
 * electron: NonNullable<ExternalsPresets["electron"]>,
 * electronMain: NonNullable<ExternalsPresets["electronMain"]>,
 * electronPreload: NonNullable<ExternalsPresets["electronPreload"]>,
 * electronRenderer: NonNullable<ExternalsPresets["electronRenderer"]>,
 * }} ExternalsPresetsNormalizedWithDefaults
 */

/**
 * Defines the shared type used by this module.
 * @typedef {InfrastructureLogging & {
 * stream: NonNullable<InfrastructureLogging["stream"]>,
 * level: NonNullable<InfrastructureLogging["level"]>,
 * debug: NonNullable<InfrastructureLogging["debug"]>,
 * colors: NonNullable<InfrastructureLogging["colors"]>,
 * appendOnly: NonNullable<InfrastructureLogging["appendOnly"]>,
 * }} InfrastructureLoggingNormalizedWithDefaults
 */

/**
 * Defines the webpack options normalized with base defaults type used by this module.
 * @typedef {WebpackOptionsNormalized & { context: NonNullable<WebpackOptionsNormalized["context"]> } & { infrastructureLogging: InfrastructureLoggingNormalizedWithDefaults }} WebpackOptionsNormalizedWithBaseDefaults
 */

/**
 * Defines the webpack options normalized with defaults type used by this module.
 * @typedef {WebpackOptionsNormalizedWithBaseDefaults & { target: NonNullable<WebpackOptionsNormalized["target"]> } & { output: OutputNormalizedWithDefaults } & { optimization: OptimizationNormalizedWithDefaults } & { devtool: NonNullable<WebpackOptionsNormalized["devtool"]> } & { stats: NonNullable<WebpackOptionsNormalized["stats"]> } & { node: NonNullable<WebpackOptionsNormalized["node"]> } & { profile: NonNullable<WebpackOptionsNormalized["profile"]> } & { parallelism: NonNullable<WebpackOptionsNormalized["parallelism"]> } & { snapshot: SnapshotNormalizedWithDefaults } & { externalsPresets: ExternalsPresetsNormalizedWithDefaults } & { externalsType: NonNullable<WebpackOptionsNormalized["externalsType"]> } & { watch: NonNullable<WebpackOptionsNormalized["watch"]> } & { performance: NonNullable<WebpackOptionsNormalized["performance"]> } & { recordsInputPath: NonNullable<WebpackOptionsNormalized["recordsInputPath"]> } & { recordsOutputPath: NonNullable<WebpackOptionsNormalized["recordsOutputPath"]> } & { dotenv: NonNullable<WebpackOptionsNormalized["dotenv"]> }} WebpackOptionsNormalizedWithDefaults
 */

/**
 * Defines the resolved options type used by this module.
 * @typedef {object} ResolvedOptions
 * @property {PlatformTargetProperties | false} platform - platform target properties
 */

const NODE_MODULES_REGEXP = /[\\/]node_modules[\\/]/i;
const DEFAULT_CACHE_NAME = "default";
const DEFAULTS = {
	// TODO webpack 6 - use xxhash64
	HASH_FUNCTION: "md4"
};

/**
 * Processes the provided obj.
 * @template T
 * @template {keyof T} P
 * @param {T} obj an object
 * @param {P} prop a property of this object
 * @param {T[P]} value a default value of the property
 * @returns {void}
 */
const D = (obj, prop, value) => {
	if (obj[prop] === undefined) {
		obj[prop] = value;
	}
};

/**
 * Processes the provided obj.
 * @template T
 * @template {keyof T} P
 * @param {T} obj an object
 * @param {P} prop a property of this object
 * @param {() => T[P]} factory a default value factory for the property
 * @returns {void}
 */
const F = (obj, prop, factory) => {
	if (obj[prop] === undefined) {
		obj[prop] = factory();
	}
};

/**
 * Sets a dynamic default value when undefined, by calling the factory function.
 * factory must return an array or undefined
 * When the current value is already an array an contains "..." it's replaced with
 * the result of the factory function
 * @template T
 * @template {keyof T} P
 * @param {T} obj an object
 * @param {P} prop a property of this object
 * @param {() => T[P]} factory a default value factory for the property
 * @returns {void}
 */
const A = (obj, prop, factory) => {
	const value = obj[prop];
	if (value === undefined) {
		obj[prop] = factory();
	} else if (Array.isArray(value)) {
		/** @type {EXPECTED_ANY[] | undefined} */
		let newArray;
		for (let i = 0; i < value.length; i++) {
			const item = value[i];
			if (item === "...") {
				if (newArray === undefined) {
					newArray = value.slice(0, i);
					obj[prop] = /** @type {T[P]} */ (/** @type {unknown} */ (newArray));
				}
				const items =
					/** @type {EXPECTED_ANY[]} */
					(/** @type {unknown} */ (factory()));
				if (items !== undefined) {
					for (const item of items) {
						newArray.push(item);
					}
				}
			} else if (newArray !== undefined) {
				newArray.push(item);
			}
		}
	}
};

/**
 * Apply webpack options base defaults.
 * @param {WebpackOptionsNormalized} options options to be modified
 * @returns {void}
 */
const applyWebpackOptionsBaseDefaults = (options) => {
	F(options, "context", () => process.cwd());
	applyInfrastructureLoggingDefaults(options.infrastructureLogging);
};

/**
 * Apply webpack options defaults.
 * @param {WebpackOptionsNormalized} options options to be modified
 * @param {number=} compilerIndex index of compiler
 * @returns {ResolvedOptions} Resolved options after apply defaults
 */
const applyWebpackOptionsDefaults = (options, compilerIndex) => {
	F(options, "context", () => process.cwd());
	F(options, "target", () =>
		getDefaultTarget(/** @type {string} */ (options.context))
	);

	const { mode, name, target } = options;

	const targetProperties =
		target === false
			? /** @type {false} */ (false)
			: typeof target === "string"
				? getTargetProperties(target, /** @type {Context} */ (options.context))
				: getTargetsProperties(
						/** @type {string[]} */ (target),
						/** @type {Context} */ (options.context)
					);

	const development = mode === "development";
	const production = mode === "production" || !mode;

	if (typeof options.entry !== "function") {
		for (const key of Object.keys(options.entry)) {
			F(
				options.entry[key],
				"import",
				() => /** @type {[string]} */ (["./src"])
			);
		}
	}

	F(
		options,
		"devtool",
		() =>
			/** @type {Devtool} */ (
				development
					? [
							options.experiments.css
								? {
										type: "css",
										use: "source-map"
									}
								: undefined,
							{
								type: "javascript",
								use: "eval"
							}
						].filter(Boolean)
					: false
			)
	);

	D(options, "watch", false);
	D(options, "profile", false);
	D(options, "parallelism", 100);
	D(options, "recordsInputPath", false);
	D(options, "recordsOutputPath", false);

	applyExperimentsDefaults(options.experiments, {
		production,
		development,
		targetProperties
	});

	const futureDefaults =
		/** @type {NonNullable<ExperimentsNormalized["futureDefaults"]>} */
		(options.experiments.futureDefaults);

	F(options, "validate", () => !(futureDefaults === true && production));

	F(options, "cache", () =>
		development ? { type: /** @type {"memory"} */ ("memory") } : false
	);
	applyCacheDefaults(options.cache, {
		name: name || DEFAULT_CACHE_NAME,
		mode: mode || "production",
		development,
		cacheUnaffected: options.experiments.cacheUnaffected,
		futureDefaults,
		compilerIndex
	});
	const cache = Boolean(options.cache);

	applySnapshotDefaults(options.snapshot, {
		production,
		futureDefaults
	});

	applyOutputDefaults(options.output, {
		context: /** @type {Context} */ (options.context),
		targetProperties,
		isAffectedByBrowserslist:
			target === undefined ||
			(typeof target === "string" && target.startsWith("browserslist")) ||
			(Array.isArray(target) &&
				target.some((target) => target.startsWith("browserslist"))),
		outputModule:
			/** @type {NonNullable<ExperimentsNormalized["outputModule"]>} */
			(options.experiments.outputModule),
		development,
		entry: options.entry,
		futureDefaults,
		asyncWebAssembly:
			/** @type {NonNullable<ExperimentsNormalized["asyncWebAssembly"]>} */
			(options.experiments.asyncWebAssembly)
	});

	applyModuleDefaults(options.module, {
		cache,
		hashSalt: /** @type {NonNullable<Output["hashSalt"]>} */ (
			options.output.hashSalt
		),
		hashFunction: /** @type {NonNullable<Output["hashFunction"]>} */ (
			options.output.hashFunction
		),
		syncWebAssembly:
			/** @type {NonNullable<ExperimentsNormalized["syncWebAssembly"]>} */
			(options.experiments.syncWebAssembly),
		asyncWebAssembly:
			/** @type {NonNullable<ExperimentsNormalized["asyncWebAssembly"]>} */
			(options.experiments.asyncWebAssembly),
		css:
			/** @type {NonNullable<ExperimentsNormalized["css"]>} */
			(options.experiments.css),
		deferImport:
			/** @type {NonNullable<ExperimentsNormalized["deferImport"]>} */
			(options.experiments.deferImport),
		sourceImport:
			/** @type {NonNullable<ExperimentsNormalized["sourceImport"]>} */
			(options.experiments.sourceImport),
		futureDefaults,
		isNode: targetProperties && targetProperties.node === true,
		uniqueName: /** @type {string} */ (options.output.uniqueName),
		targetProperties,
		mode: options.mode,
		outputModule:
			/** @type {NonNullable<WebpackOptionsNormalized["output"]["module"]>} */
			(options.output.module)
	});

	applyExternalsPresetsDefaults(options.externalsPresets, {
		targetProperties,
		buildHttp: Boolean(options.experiments.buildHttp),
		outputModule:
			/** @type {NonNullable<WebpackOptionsNormalized["output"]["module"]>} */
			(options.output.module)
	});

	applyLoaderDefaults(
		/** @type {NonNullable<WebpackOptionsNormalized["loader"]>} */ (
			options.loader
		),
		{ targetProperties, environment: options.output.environment }
	);

	F(options, "externalsType", () => {
		const validExternalTypes = require("../../schemas/WebpackOptions.json")
			.definitions.ExternalsType.enum;

		return options.output.library &&
			validExternalTypes.includes(options.output.library.type)
			? /** @type {ExternalsType} */ (options.output.library.type)
			: options.output.module
				? "module-import"
				: "var";
	});

	applyNodeDefaults(options.node, {
		futureDefaults:
			/** @type {NonNullable<WebpackOptionsNormalized["experiments"]["futureDefaults"]>} */
			(options.experiments.futureDefaults),
		outputModule:
			/** @type {NonNullable<WebpackOptionsNormalized["output"]["module"]>} */
			(options.output.module),
		targetProperties
	});

	F(options, "performance", () =>
		production &&
		targetProperties &&
		(targetProperties.browser || targetProperties.browser === null)
			? {}
			: false
	);
	applyPerformanceDefaults(
		/** @type {NonNullable<WebpackOptionsNormalized["performance"]>} */
		(options.performance),
		{
			production
		}
	);

	applyOptimizationDefaults(options.optimization, {
		development,
		production,
		css:
			/** @type {NonNullable<ExperimentsNormalized["css"]>} */
			(options.experiments.css),
		records: Boolean(options.recordsInputPath || options.recordsOutputPath)
	});

	options.resolve = cleverMerge(
		getResolveDefaults({
			cache,
			context: /** @type {Context} */ (options.context),
			targetProperties,
			mode: /** @type {Mode} */ (options.mode),
			css:
				/** @type {NonNullable<ExperimentsNormalized["css"]>} */
				(options.experiments.css)
		}),
		options.resolve
	);

	options.resolveLoader = cleverMerge(
		getResolveLoaderDefaults({ cache }),
		options.resolveLoader
	);

	return {
		platform:
			targetProperties === false
				? targetProperties
				: {
						web: targetProperties.web,
						browser: targetProperties.browser,
						webworker: targetProperties.webworker,
						node: targetProperties.node,
						nwjs: targetProperties.nwjs,
						electron: targetProperties.electron
					}
	};
};

/**
 * Apply experiments defaults.
 * @param {ExperimentsNormalized} experiments options
 * @param {object} options options
 * @param {boolean} options.production is production
 * @param {boolean} options.development is development mode
 * @param {TargetProperties | false} options.targetProperties target properties
 * @returns {void}
 */
const applyExperimentsDefaults = (
	experiments,
	{ production, development, targetProperties }
) => {
	D(experiments, "futureDefaults", false);
	D(experiments, "backCompat", !experiments.futureDefaults);
	// TODO do we need sync web assembly in webpack@6?
	D(experiments, "syncWebAssembly", false);
	D(experiments, "asyncWebAssembly", experiments.futureDefaults);
	D(experiments, "outputModule", false);
	D(experiments, "lazyCompilation", undefined);
	D(experiments, "buildHttp", undefined);
	D(experiments, "cacheUnaffected", experiments.futureDefaults);
	D(experiments, "deferImport", false);
	D(experiments, "sourceImport", false);
	F(experiments, "css", () => (experiments.futureDefaults ? true : undefined));

	if (typeof experiments.buildHttp === "object") {
		D(experiments.buildHttp, "frozen", production);
		D(experiments.buildHttp, "upgrade", false);
	}
};

/**
 * Apply cache defaults.
 * @param {CacheOptionsNormalized} cache options
 * @param {object} options options
 * @param {string} options.name name
 * @param {Mode} options.mode mode
 * @param {boolean} options.futureDefaults is future defaults enabled
 * @param {boolean} options.development is development mode
 * @param {number=} options.compilerIndex index of compiler
 * @param {Experiments["cacheUnaffected"]} options.cacheUnaffected the cacheUnaffected experiment is enabled
 * @returns {void}
 */
const applyCacheDefaults = (
	cache,
	{ name, mode, development, cacheUnaffected, compilerIndex, futureDefaults }
) => {
	if (cache === false) return;
	switch (cache.type) {
		case "filesystem":
			F(cache, "name", () =>
				compilerIndex !== undefined
					? `${`${name}-${mode}`}__compiler${compilerIndex + 1}__`
					: `${name}-${mode}`
			);
			D(cache, "version", "");
			F(cache, "cacheDirectory", () => {
				const cwd = process.cwd();
				/** @type {string | undefined} */
				let dir = cwd;
				for (;;) {
					try {
						if (fs.statSync(path.join(dir, "package.json")).isFile()) break;
						// eslint-disable-next-line no-empty
					} catch (_err) {}
					const parent = path.dirname(dir);
					if (dir === parent) {
						dir = undefined;
						break;
					}
					dir = parent;
				}
				if (!dir) {
					return path.resolve(cwd, ".cache/webpack");
				} else if (process.versions.pnp === "1") {
					return path.resolve(dir, ".pnp/.cache/webpack");
				} else if (process.versions.pnp === "3") {
					return path.resolve(dir, ".yarn/.cache/webpack");
				}
				return path.resolve(dir, "node_modules/.cache/webpack");
			});
			F(cache, "cacheLocation", () =>
				path.resolve(
					/** @type {NonNullable<FileCacheOptions["cacheDirectory"]>} */
					(cache.cacheDirectory),
					/** @type {NonNullable<FileCacheOptions["name"]>} */ (cache.name)
				)
			);
			D(cache, "hashAlgorithm", futureDefaults ? "xxhash64" : "md4");
			D(cache, "store", "pack");
			D(cache, "compression", false);
			D(cache, "profile", false);
			D(cache, "idleTimeout", 60000);
			D(cache, "idleTimeoutForInitialStore", 5000);
			D(cache, "idleTimeoutAfterLargeChanges", 1000);
			D(cache, "maxMemoryGenerations", development ? 5 : Infinity);
			D(cache, "maxAge", 1000 * 60 * 60 * 24 * 60); // 1 month
			D(cache, "allowCollectingMemory", development);
			D(cache, "memoryCacheUnaffected", development && cacheUnaffected);
			D(cache, "readonly", false);
			D(
				/** @type {NonNullable<FileCacheOptions["buildDependencies"]>} */
				(cache.buildDependencies),
				"defaultWebpack",
				[path.resolve(__dirname, "..") + path.sep]
			);
			break;
		case "memory":
			D(cache, "maxGenerations", Infinity);
			D(cache, "cacheUnaffected", development && cacheUnaffected);
			break;
	}
};

/**
 * Apply snapshot defaults.
 * @param {SnapshotOptions} snapshot options
 * @param {object} options options
 * @param {boolean} options.production is production
 * @param {boolean} options.futureDefaults is future defaults enabled
 * @returns {void}
 */
const applySnapshotDefaults = (snapshot, { production, futureDefaults }) => {
	if (futureDefaults) {
		F(snapshot, "managedPaths", () =>
			process.versions.pnp === "3"
				? [
						/^(.+?(?:[\\/]\.yarn[\\/]unplugged[\\/][^\\/]+)?[\\/]node_modules[\\/])/
					]
				: [/^(.+?[\\/]node_modules[\\/])/]
		);
		F(snapshot, "immutablePaths", () =>
			process.versions.pnp === "3"
				? [/^(.+?[\\/]cache[\\/][^\\/]+\.zip[\\/]node_modules[\\/])/]
				: []
		);
	} else {
		A(snapshot, "managedPaths", () => {
			if (process.versions.pnp === "3") {
				const match =
					/^(.+?)[\\/]cache[\\/]watchpack-npm-[^\\/]+\.zip[\\/]node_modules[\\/]/.exec(
						require.resolve("watchpack")
					);
				if (match) {
					return [path.resolve(match[1], "unplugged")];
				}
			} else {
				const match = /^(.+?[\\/]node_modules[\\/])/.exec(
					require.resolve("watchpack")
				);
				if (match) {
					return [match[1]];
				}
			}
			return [];
		});
		A(snapshot, "immutablePaths", () => {
			if (process.versions.pnp === "1") {
				const match =
					/^(.+?[\\/]v4)[\\/]npm-watchpack-[^\\/]+-[\da-f]{40}[\\/]node_modules[\\/]/.exec(
						require.resolve("watchpack")
					);
				if (match) {
					return [match[1]];
				}
			} else if (process.versions.pnp === "3") {
				const match =
					/^(.+?)[\\/]watchpack-npm-[^\\/]+\.zip[\\/]node_modules[\\/]/.exec(
						require.resolve("watchpack")
					);
				if (match) {
					return [match[1]];
				}
			}
			return [];
		});
	}
	F(snapshot, "unmanagedPaths", () => []);
	F(snapshot, "resolveBuildDependencies", () => ({
		timestamp: true,
		hash: true
	}));
	F(snapshot, "buildDependencies", () => ({ timestamp: true, hash: true }));
	F(snapshot, "module", () =>
		production ? { timestamp: true, hash: true } : { timestamp: true }
	);
	F(snapshot, "contextModule", () => ({ timestamp: true }));
	F(snapshot, "resolve", () =>
		production ? { timestamp: true, hash: true } : { timestamp: true }
	);
};

/**
 * Apply javascript parser options defaults.
 * @param {JavascriptParserOptions} parserOptions parser options
 * @param {object} options options
 * @param {boolean} options.futureDefaults is future defaults enabled
 * @param {boolean} options.deferImport is defer import enabled
 * @param {boolean} options.sourceImport is import source enabled
 * @param {boolean} options.isNode is node target platform
 * @param {boolean} options.outputModule is output.module enabled
 * @returns {void}
 */
const applyJavascriptParserOptionsDefaults = (
	parserOptions,
	{ futureDefaults, deferImport, sourceImport, isNode, outputModule }
) => {
	D(parserOptions, "unknownContextRequest", ".");
	D(parserOptions, "unknownContextRegExp", false);
	D(parserOptions, "unknownContextRecursive", true);
	D(parserOptions, "unknownContextCritical", true);
	D(parserOptions, "exprContextRequest", ".");
	D(parserOptions, "exprContextRegExp", false);
	D(parserOptions, "exprContextRecursive", true);
	D(parserOptions, "exprContextCritical", true);
	D(parserOptions, "wrappedContextRegExp", /.*/);
	D(parserOptions, "wrappedContextRecursive", true);
	D(parserOptions, "wrappedContextCritical", false);
	D(parserOptions, "strictThisContextOnImports", false);
	D(parserOptions, "importMeta", outputModule ? "preserve-unknown" : true);
	D(parserOptions, "dynamicImportMode", "lazy");
	D(parserOptions, "dynamicImportPrefetch", false);
	D(parserOptions, "dynamicImportPreload", false);
	D(parserOptions, "dynamicImportFetchPriority", false);
	D(parserOptions, "createRequire", isNode);
	D(parserOptions, "dynamicUrl", true);
	D(parserOptions, "deferImport", deferImport);
	D(parserOptions, "sourceImport", sourceImport);
	if (futureDefaults) D(parserOptions, "exportsPresence", "error");
};

/**
 * Apply json generator options defaults.
 * @param {JsonGeneratorOptions} generatorOptions generator options
 * @returns {void}
 */
const applyJsonGeneratorOptionsDefaults = (generatorOptions) => {
	D(generatorOptions, "JSONParse", true);
};

/**
 * Apply css generator options defaults.
 * @param {CssGeneratorOptions} generatorOptions generator options
 * @param {object} options options
 * @param {TargetProperties | false} options.targetProperties target properties
 * @returns {void}
 */
const applyCssGeneratorOptionsDefaults = (
	generatorOptions,
	{ targetProperties }
) => {
	D(
		generatorOptions,
		"exportsOnly",
		!targetProperties || targetProperties.document === false
	);
	D(generatorOptions, "esModule", true);
};

/**
 * Apply module defaults.
 * @param {ModuleOptions} module options
 * @param {object} options options
 * @param {boolean} options.cache is caching enabled
 * @param {boolean} options.syncWebAssembly is syncWebAssembly enabled
 * @param {boolean} options.asyncWebAssembly is asyncWebAssembly enabled
 * @param {boolean} options.css is css enabled
 * @param {boolean} options.futureDefaults is future defaults enabled
 * @param {string} options.uniqueName the unique name
 * @param {boolean} options.isNode is node target platform
 * @param {boolean} options.deferImport is defer import enabled
 * @param {boolean} options.sourceImport is import source enabled
 * @param {TargetProperties | false} options.targetProperties target properties
 * @param {Mode | undefined} options.mode mode
 * @param {HashSalt} options.hashSalt hash salt
 * @param {HashFunction} options.hashFunction hash function
 * @param {boolean} options.outputModule is output.module enabled
 * @returns {void}
 */
const applyModuleDefaults = (
	module,
	{
		hashSalt,
		hashFunction,
		cache,
		syncWebAssembly,
		asyncWebAssembly,
		css,
		futureDefaults,
		isNode,
		uniqueName,
		targetProperties,
		mode,
		deferImport,
		sourceImport,
		outputModule
	}
) => {
	if (cache) {
		D(
			module,
			"unsafeCache",
			/**
			 * Handles the callback logic for this hook.
			 * @param {Module} module module
			 * @returns {boolean} true, if we want to cache the module
			 */
			(module) => {
				const name = module.nameForCondition();
				if (!name) {
					return false;
				}
				return NODE_MODULES_REGEXP.test(name);
			}
		);
	} else {
		D(module, "unsafeCache", false);
	}

	F(module.parser, ASSET_MODULE_TYPE, () => ({}));
	F(
		/** @type {NonNullable<ParserOptionsByModuleTypeKnown[ASSET_MODULE_TYPE]>} */
		(module.parser[ASSET_MODULE_TYPE]),
		"dataUrlCondition",
		() => ({})
	);
	if (
		typeof (
			/** @type {NonNullable<ParserOptionsByModuleTypeKnown[ASSET_MODULE_TYPE]>} */
			(module.parser[ASSET_MODULE_TYPE]).dataUrlCondition
		) === "object"
	) {
		D(
			/** @type {NonNullable<ParserOptionsByModuleTypeKnown[ASSET_MODULE_TYPE]>} */
			(module.parser[ASSET_MODULE_TYPE]).dataUrlCondition,
			"maxSize",
			8096
		);
	}

	F(module.parser, "javascript", () => ({}));
	F(module.parser, JSON_MODULE_TYPE, () => ({}));
	D(
		/** @type {NonNullable<ParserOptionsByModuleTypeKnown[JSON_MODULE_TYPE]>} */
		(module.parser[JSON_MODULE_TYPE]),
		"exportsDepth",
		mode === "development" ? 1 : Infinity
	);

	applyJavascriptParserOptionsDefaults(
		/** @type {NonNullable<ParserOptionsByModuleTypeKnown["javascript"]>} */
		(module.parser.javascript),
		{
			futureDefaults,
			deferImport,
			sourceImport,
			isNode,
			outputModule
		}
	);

	F(module.generator, "json", () => ({}));
	applyJsonGeneratorOptionsDefaults(
		/** @type {NonNullable<GeneratorOptionsByModuleTypeKnown["json"]>} */
		(module.generator.json)
	);

	if (css) {
		F(module.parser, CSS_MODULE_TYPE, () => ({}));

		D(
			/** @type {NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE]>} */
			(module.parser[CSS_MODULE_TYPE]),
			"import",
			true
		);
		D(
			/** @type {NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE]>} */
			(module.parser[CSS_MODULE_TYPE]),
			"url",
			true
		);
		D(
			/** @type {NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE]>} */
			(module.parser[CSS_MODULE_TYPE]),
			"namedExports",
			true
		);

		for (const type of [
			CSS_MODULE_TYPE_AUTO,
			CSS_MODULE_TYPE_MODULE,
			CSS_MODULE_TYPE_GLOBAL
		]) {
			F(module.parser, type, () => ({}));

			D(
				/** @type {NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_GLOBAL]>} */
				(module.parser[type]),
				"animation",
				true
			);
			D(
				/** @type {NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_GLOBAL]>} */
				(module.parser[type]),
				"container",
				true
			);
			D(
				/** @type {NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_GLOBAL]>} */
				(module.parser[type]),
				"customIdents",
				true
			);
			D(
				/** @type {NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_GLOBAL]>} */
				(module.parser[type]),
				"dashedIdents",
				true
			);
			D(
				/** @type {NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_GLOBAL]>} */
				(module.parser[type]),
				"function",
				true
			);
			D(
				/** @type {NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<ParserOptionsByModuleTypeKnown[CSS_MODULE_TYPE_GLOBAL]>} */
				(module.parser[type]),
				"grid",
				true
			);
		}

		F(module.generator, CSS_MODULE_TYPE, () => ({}));

		applyCssGeneratorOptionsDefaults(
			/** @type {NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE]>} */
			(module.generator[CSS_MODULE_TYPE]),
			{ targetProperties }
		);

		const localIdentName =
			mode === "development"
				? uniqueName.length > 0
					? "[uniqueName]-[id]-[local]"
					: "[id]-[local]"
				: "[fullhash]";
		const localIdentHashSalt = hashSalt;
		const localIdentHashDigest = "base64url";
		const localIdentHashDigestLength = 6;
		const exportsConvention = "as-is";

		for (const type of [
			CSS_MODULE_TYPE_AUTO,
			CSS_MODULE_TYPE_MODULE,
			CSS_MODULE_TYPE_GLOBAL
		]) {
			F(module.generator, type, () => ({}));

			D(
				/** @type {NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_GLOBAL]>} */
				(module.generator[type]),
				"localIdentName",
				localIdentName
			);

			D(
				/** @type {NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_GLOBAL]>} */
				(module.generator[type]),
				"localIdentHashSalt",
				localIdentHashSalt
			);

			D(
				/** @type {NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]>} */
				(module.generator[type]),
				"localIdentHashFunction",
				hashFunction
			);

			D(
				/** @type {NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]>} */
				(module.generator[type]),
				"localIdentHashDigest",
				localIdentHashDigest
			);

			D(
				/** @type {NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]>} */
				(module.generator[type]),
				"localIdentHashDigestLength",
				localIdentHashDigestLength
			);

			D(
				/** @type {NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_AUTO]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_MODULE]> | NonNullable<GeneratorOptionsByModuleTypeKnown[CSS_MODULE_TYPE_GLOBAL]>} */
				(module.generator[type]),
				"exportsConvention",
				exportsConvention
			);
		}
	}

	A(module, "defaultRules", () => {
		const esm = {
			type: JAVASCRIPT_MODULE_TYPE_ESM,
			resolve: {
				byDependency: {
					esm: {
						fullySpecified: true
					}
				}
			}
		};
		const commonjs = {
			type: JAVASCRIPT_MODULE_TYPE_DYNAMIC
		};
		/** @type {RuleSetRules} */
		const rules = [
			{
				mimetype: "application/node",
				type: JAVASCRIPT_MODULE_TYPE_AUTO
			},
			{
				test: /\.json$/i,
				type: JSON_MODULE_TYPE
			},
			{
				mimetype: "application/json",
				type: JSON_MODULE_TYPE
			},
			{
				test: /\.mjs$/i,
				...esm
			},
			{
				test: /\.js$/i,
				descriptionData: {
					type: "module"
				},
				...esm
			},
			{
				test: /\.cjs$/i,
				...commonjs
			},
			{
				test: /\.js$/i,
				descriptionData: {
					type: "commonjs"
				},
				...commonjs
			},
			{
				mimetype: {
					or: ["text/javascript", "application/javascript"]
				},
				...esm
			}
		];
		if (asyncWebAssembly) {
			const wasm = {
				type: WEBASSEMBLY_MODULE_TYPE_ASYNC,
				rules: [
					{
						descriptionData: {
							type: "module"
						},
						resolve: {
							fullySpecified: true
						}
					}
				]
			};
			rules.push({
				test: /\.wasm$/i,
				...wasm
			});
			rules.push({
				mimetype: "application/wasm",
				...wasm
			});
		} else if (syncWebAssembly) {
			const wasm = {
				type: WEBASSEMBLY_MODULE_TYPE_SYNC,
				rules: [
					{
						descriptionData: {
							type: "module"
						},
						resolve: {
							fullySpecified: true
						}
					}
				]
			};
			rules.push({
				test: /\.wasm$/i,
				...wasm
			});
			rules.push({
				mimetype: "application/wasm",
				...wasm
			});
		}
		if (css) {
			const resolve = {
				fullySpecified: true,
				preferRelative: true
			};
			rules.push({
				test: /\.css$/i,
				type: CSS_MODULE_TYPE_AUTO,
				resolve
			});
			rules.push({
				mimetype: "text/css+module",
				type: CSS_MODULE_TYPE_MODULE,
				resolve
			});
			rules.push({
				mimetype: "text/css",
				type: CSS_MODULE_TYPE,
				resolve
			});
			// For CSS modules, i.e. `.class { composes: className from "./style.css" }`
			// We inherit for such constructions
			rules.push({
				dependency: /css-import-local-module/,
				type: CSS_MODULE_TYPE_MODULE,
				resolve
			});
			rules.push({
				dependency: /css-import-global-module/,
				type: CSS_MODULE_TYPE_GLOBAL,
				resolve
			});

			rules.push(
				{
					with: { type: "css" },
					parser: {
						exportType: "css-style-sheet"
					},
					resolve
				},
				{
					assert: { type: "css" },
					parser: {
						exportType: "css-style-sheet"
					},
					resolve
				}
			);
		}
		rules.push(
			{
				dependency: "url",
				oneOf: [
					{
						scheme: /^data$/,
						type: ASSET_MODULE_TYPE_INLINE
					},
					{
						type: ASSET_MODULE_TYPE_RESOURCE
					}
				]
			},
			{
				with: { type: JSON_MODULE_TYPE },
				type: JSON_MODULE_TYPE,
				parser: { namedExports: false }
			},
			{
				assert: { type: JSON_MODULE_TYPE },
				type: JSON_MODULE_TYPE,
				parser: { namedExports: false }
			},
			{
				with: { type: "text" },
				type: ASSET_MODULE_TYPE_SOURCE
			},
			{
				with: { type: "bytes" },
				type: ASSET_MODULE_TYPE_BYTES
			}
		);
		return rules;
	});
};

/**
 * Apply output defaults.
 * @param {Output} output options
 * @param {object} options options
 * @param {string} options.context context
 * @param {TargetProperties | false} options.targetProperties target properties
 * @param {boolean} options.isAffectedByBrowserslist is affected by browserslist
 * @param {boolean} options.outputModule is outputModule experiment enabled
 * @param {boolean} options.development is development mode
 * @param {Entry} options.entry entry option
 * @param {boolean} options.futureDefaults is future defaults enabled
 * @param {boolean} options.asyncWebAssembly is asyncWebAssembly enabled
 * @returns {void}
 */
const applyOutputDefaults = (
	output,
	{
		context,
		targetProperties: tp,
		isAffectedByBrowserslist,
		outputModule,
		development,
		entry,
		futureDefaults,
		asyncWebAssembly
	}
) => {
	/**
	 * Returns a readable library name.
	 * @param {Library=} library the library option
	 * @returns {string} a readable library name
	 */
	const getLibraryName = (library) => {
		const libraryName =
			typeof library === "object" &&
			library &&
			!Array.isArray(library) &&
			"type" in library
				? library.name
				: /** @type {LibraryName} */ (library);
		if (Array.isArray(libraryName)) {
			return libraryName.join(".");
		} else if (typeof libraryName === "object") {
			return getLibraryName(libraryName.root);
		} else if (typeof libraryName === "string") {
			return libraryName;
		}
		return "";
	};

	F(output, "uniqueName", () => {
		const libraryName = getLibraryName(output.library).replace(
			/^\[(\\*[\w:]+\\*)\](\.)|(\.)\[(\\*[\w:]+\\*)\](?=\.|$)|\[(\\*[\w:]+\\*)\]/g,
			(m, a, d1, d2, b, c) => {
				const content = a || b || c;
				return content.startsWith("\\") && content.endsWith("\\")
					? `${d2 || ""}[${content.slice(1, -1)}]${d1 || ""}`
					: "";
			}
		);
		if (libraryName) return libraryName;
		const pkgPath = path.resolve(context, "package.json");
		try {
			const packageInfo = JSON.parse(fs.readFileSync(pkgPath, "utf8"));
			return packageInfo.name || "";
		} catch (err) {
			if (/** @type {Error & { code: string }} */ (err).code !== "ENOENT") {
				/** @type {Error & { code: string }} */
				(err).message +=
					`\nwhile determining default 'output.uniqueName' from 'name' in ${pkgPath}`;
				throw err;
			}
			return "";
		}
	});

	F(output, "module", () => Boolean(outputModule));

	const environment = /** @type {Environment} */ (output.environment);
	/**
	 * Returns true, when v is truthy or undefined.
	 * @param {boolean | undefined} v value
	 * @returns {boolean} true, when v is truthy or undefined
	 */
	const optimistic = (v) => v || v === undefined;
	/**
	 * Conditionally optimistic.
	 * @param {boolean | undefined} v value
	 * @param {boolean | undefined} c condition
	 * @returns {boolean | undefined} true, when v is truthy or undefined, or c is truthy
	 */
	const conditionallyOptimistic = (v, c) => (v === undefined && c) || v;

	F(
		environment,
		"globalThis",
		() => /** @type {boolean | undefined} */ (tp && tp.globalThis)
	);
	F(
		environment,
		"bigIntLiteral",
		() =>
			tp && optimistic(/** @type {boolean | undefined} */ (tp.bigIntLiteral))
	);
	F(
		environment,
		"const",
		() => tp && optimistic(/** @type {boolean | undefined} */ (tp.const))
	);
	F(
		environment,
		"methodShorthand",
		() =>
			tp && optimistic(/** @type {boolean | undefined} */ (tp.methodShorthand))
	);
	F(
		environment,
		"arrowFunction",
		() =>
			tp && optimistic(/** @type {boolean | undefined} */ (tp.arrowFunction))
	);
	F(
		environment,
		"asyncFunction",
		() =>
			tp && optimistic(/** @type {boolean | undefined} */ (tp.asyncFunction))
	);
	F(
		environment,
		"forOf",
		() => tp && optimistic(/** @type {boolean | undefined} */ (tp.forOf))
	);
	F(
		environment,
		"destructuring",
		() =>
			tp && optimistic(/** @type {boolean | undefined} */ (tp.destructuring))
	);
	F(
		environment,
		"optionalChaining",
		() =>
			tp && optimistic(/** @type {boolean | undefined} */ (tp.optionalChaining))
	);
	F(
		environment,
		"nodePrefixForCoreModules",
		() =>
			tp &&
			optimistic(
				/** @type {boolean | undefined} */ (tp.nodePrefixForCoreModules)
			)
	);
	F(
		environment,
		"importMetaDirnameAndFilename",
		() =>
			// No optimistic, because it is new
			tp && /** @type {boolean | undefined} */ (tp.importMetaDirnameAndFilename)
	);
	F(
		environment,
		"templateLiteral",
		() =>
			tp && optimistic(/** @type {boolean | undefined} */ (tp.templateLiteral))
	);
	F(environment, "dynamicImport", () =>
		conditionallyOptimistic(
			/** @type {boolean | undefined} */ (tp && tp.dynamicImport),
			output.module
		)
	);
	F(environment, "dynamicImportInWorker", () =>
		conditionallyOptimistic(
			/** @type {boolean | undefined} */ (tp && tp.dynamicImportInWorker),
			output.module
		)
	);
	F(environment, "module", () =>
		conditionallyOptimistic(
			/** @type {boolean | undefined} */ (tp && tp.module),
			output.module
		)
	);
	F(
		environment,
		"document",
		() => tp && optimistic(/** @type {boolean | undefined} */ (tp.document))
	);

	D(output, "filename", output.module ? "[name].mjs" : "[name].js");
	F(output, "iife", () => !output.module);
	D(output, "importFunctionName", "import");
	D(output, "importMetaName", "import.meta");
	F(output, "chunkFilename", () => {
		const filename =
			/** @type {NonNullable<Output["chunkFilename"]>} */
			(output.filename);
		if (typeof filename !== "function") {
			const hasName = filename.includes("[name]");
			const hasId = filename.includes("[id]");
			const hasChunkHash = filename.includes("[chunkhash]");
			const hasContentHash = filename.includes("[contenthash]");
			// Anything changing depending on chunk is fine
			if (hasChunkHash || hasContentHash || hasName || hasId) return filename;
			// Otherwise prefix "[id]." in front of the basename to make it changing
			return filename.replace(/(^|\/)([^/]*(?:\?|$))/, "$1[id].$2");
		}
		return output.module ? "[id].mjs" : "[id].js";
	});
	F(output, "cssFilename", () => {
		const filename =
			/** @type {NonNullable<Output["cssFilename"]>} */
			(output.filename);
		if (typeof filename !== "function") {
			return filename.replace(/\.[mc]?js(\?|$)/, ".css$1");
		}
		return "[id].css";
	});
	F(output, "cssChunkFilename", () => {
		const chunkFilename =
			/** @type {NonNullable<Output["cssChunkFilename"]>} */
			(output.chunkFilename);
		if (typeof chunkFilename !== "function") {
			return chunkFilename.replace(/\.[mc]?js(\?|$)/, ".css$1");
		}
		return "[id].css";
	});
	D(output, "assetModuleFilename", "[hash][ext][query][fragment]");
	D(output, "webassemblyModuleFilename", "[hash].module.wasm");
	D(output, "compareBeforeEmit", true);
	D(output, "charset", !futureDefaults);
	const uniqueNameId = Template.toIdentifier(
		/** @type {NonNullable<Output["uniqueName"]>} */ (output.uniqueName)
	);
	F(output, "hotUpdateGlobal", () => `webpackHotUpdate${uniqueNameId}`);
	F(output, "chunkLoadingGlobal", () => `webpackChunk${uniqueNameId}`);
	F(output, "globalObject", () => {
		if (tp) {
			if (tp.global) return "global";
			if (tp.globalThis) return "globalThis";
			// For universal target (i.e. code can be run in browser/node/worker etc.)
			if (tp.web === null && tp.node === null && tp.module) return "globalThis";
		}
		return "self";
	});
	F(output, "chunkFormat", () => {
		if (tp) {
			const helpMessage = isAffectedByBrowserslist
				? "Make sure that your 'browserslist' includes only platforms that support these features or select an appropriate 'target' to allow selecting a chunk format by default. Alternatively specify the 'output.chunkFormat' directly."
				: "Select an appropriate 'target' to allow selecting one by default, or specify the 'output.chunkFormat' directly.";
			if (output.module) {
				if (environment.dynamicImport) return "module";
				if (tp.document) return "array-push";
				throw new Error(
					"For the selected environment is no default ESM chunk format available:\n" +
						"ESM exports can be chosen when 'import()' is available.\n" +
						`JSONP Array push can be chosen when 'document' is available.\n${helpMessage}`
				);
			} else {
				if (tp.document) return "array-push";
				if (tp.require) return "commonjs";
				if (tp.nodeBuiltins) return "commonjs";
				if (tp.importScripts) return "array-push";
				throw new Error(
					"For the selected environment is no default script chunk format available:\n" +
						`${
							tp.module
								? "Module ('module') can be chosen when ES modules are available (please set 'experiments.outputModule' and 'output.module' to `true`)"
								: ""
						}\n` +
						"JSONP Array push ('array-push') can be chosen when 'document' or 'importScripts' is available.\n" +
						`CommonJs exports ('commonjs') can be chosen when 'require' or node builtins are available.\n${helpMessage}`
				);
			}
		}
		throw new Error(
			"Chunk format can't be selected by default when no target is specified"
		);
	});
	D(output, "asyncChunks", true);
	F(outp