webpack/lib/NormalModuleFactory.js

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

"use strict";

const asyncLib = require("neo-async");
const {
	AsyncSeriesBailHook,
	SyncWaterfallHook,
	SyncBailHook,
	SyncHook,
	HookMap
} = require("tapable");
const Module = require("./Module");
const ModuleFactory = require("./ModuleFactory");
const NormalModule = require("./NormalModule");
const BasicEffectRulePlugin = require("./rules/BasicEffectRulePlugin");
const BasicMatcherRulePlugin = require("./rules/BasicMatcherRulePlugin");
const DescriptionDataMatcherRulePlugin = require("./rules/DescriptionDataMatcherRulePlugin");
const RuleSetCompiler = require("./rules/RuleSetCompiler");
const UseEffectRulePlugin = require("./rules/UseEffectRulePlugin");
const LazySet = require("./util/LazySet");
const { getScheme } = require("./util/URLAbsoluteSpecifier");
const { cachedCleverMerge, cachedSetProperty } = require("./util/cleverMerge");
const { join } = require("./util/fs");
const { parseResource } = require("./util/identifier");

/** @typedef {import("../declarations/WebpackOptions").ModuleOptionsNormalized} ModuleOptions */
/** @typedef {import("./Generator")} Generator */
/** @typedef {import("./ModuleFactory").ModuleFactoryCreateData} ModuleFactoryCreateData */
/** @typedef {import("./ModuleFactory").ModuleFactoryResult} ModuleFactoryResult */
/** @typedef {import("./Parser")} Parser */
/** @typedef {import("./ResolverFactory")} ResolverFactory */
/** @typedef {import("./dependencies/ModuleDependency")} ModuleDependency */
/** @typedef {import("./util/fs").InputFileSystem} InputFileSystem */

/**
 * @typedef {Object} ResolveData
 * @property {ModuleFactoryCreateData["contextInfo"]} contextInfo
 * @property {ModuleFactoryCreateData["resolveOptions"]} resolveOptions
 * @property {string} context
 * @property {string} request
 * @property {ModuleDependency[]} dependencies
 * @property {Object} createData
 * @property {LazySet<string>} fileDependencies
 * @property {LazySet<string>} missingDependencies
 * @property {LazySet<string>} contextDependencies
 * @property {boolean} cacheable allow to use the unsafe cache
 */

/**
 * @typedef {Object} ResourceData
 * @property {string} resource
 * @property {string} path
 * @property {string} query
 * @property {string} fragment
 */

/** @typedef {ResourceData & { data: Record<string, any> }} ResourceDataWithData */

const EMPTY_RESOLVE_OPTIONS = {};
const EMPTY_PARSER_OPTIONS = {};
const EMPTY_GENERATOR_OPTIONS = {};

const MATCH_RESOURCE_REGEX = /^([^!]+)!=!/;

const loaderToIdent = data => {
	if (!data.options) {
		return data.loader;
	}
	if (typeof data.options === "string") {
		return data.loader + "?" + data.options;
	}
	if (typeof data.options !== "object") {
		throw new Error("loader options must be string or object");
	}
	if (data.ident) {
		return data.loader + "??" + data.ident;
	}
	return data.loader + "?" + JSON.stringify(data.options);
};

const stringifyLoadersAndResource = (loaders, resource) => {
	let str = "";
	for (const loader of loaders) {
		str += loaderToIdent(loader) + "!";
	}
	return str + resource;
};

/**
 * @param {string} resultString resultString
 * @returns {{loader: string, options: string|undefined}} parsed loader request
 */
const identToLoaderRequest = resultString => {
	const idx = resultString.indexOf("?");
	if (idx >= 0) {
		const loader = resultString.substr(0, idx);
		const options = resultString.substr(idx + 1);
		return {
			loader,
			options
		};
	} else {
		return {
			loader: resultString,
			options: undefined
		};
	}
};

const needCalls = (times, callback) => {
	return err => {
		if (--times === 0) {
			return callback(err);
		}
		if (err && times > 0) {
			times = NaN;
			return callback(err);
		}
	};
};

const mergeGlobalOptions = (globalOptions, type, localOptions) => {
	const parts = type.split("/");
	let result;
	let current = "";
	for (const part of parts) {
		current = current ? `${current}/${part}` : part;
		const options = globalOptions[current];
		if (typeof options === "object") {
			if (result === undefined) {
				result = options;
			} else {
				result = cachedCleverMerge(result, options);
			}
		}
	}
	if (result === undefined) {
		return localOptions;
	} else {
		return cachedCleverMerge(result, localOptions);
	}
};

// TODO webpack 6 remove
const deprecationChangedHookMessage = (name, hook) => {
	const names = hook.taps
		.map(tapped => {
			return tapped.name;
		})
		.join(", ");

	return (
		`NormalModuleFactory.${name} (${names}) is no longer a waterfall hook, but a bailing hook instead. ` +
		"Do not return the passed object, but modify it instead. " +
		"Returning false will ignore the request and results in no module created."
	);
};

/** @type {WeakMap<ModuleDependency, ModuleFactoryResult & { module: { restoreFromUnsafeCache: Function }}>} */
const unsafeCacheDependencies = new WeakMap();

/** @type {WeakMap<Module, object>} */
const unsafeCacheData = new WeakMap();

const ruleSetCompiler = new RuleSetCompiler([
	new BasicMatcherRulePlugin("test", "resource"),
	new BasicMatcherRulePlugin("mimetype"),
	new BasicMatcherRulePlugin("dependency"),
	new BasicMatcherRulePlugin("include", "resource"),
	new BasicMatcherRulePlugin("exclude", "resource", true),
	new BasicMatcherRulePlugin("resource"),
	new BasicMatcherRulePlugin("resourceQuery"),
	new BasicMatcherRulePlugin("resourceFragment"),
	new BasicMatcherRulePlugin("realResource"),
	new BasicMatcherRulePlugin("issuer"),
	new BasicMatcherRulePlugin("compiler"),
	new BasicMatcherRulePlugin("issuerLayer"),
	new DescriptionDataMatcherRulePlugin(),
	new BasicEffectRulePlugin("type"),
	new BasicEffectRulePlugin("sideEffects"),
	new BasicEffectRulePlugin("parser"),
	new BasicEffectRulePlugin("resolve"),
	new BasicEffectRulePlugin("generator"),
	new BasicEffectRulePlugin("layer"),
	new UseEffectRulePlugin()
]);

class NormalModuleFactory extends ModuleFactory {
	/**
	 * @param {Object} param params
	 * @param {string=} param.context context
	 * @param {InputFileSystem} param.fs file system
	 * @param {ResolverFactory} param.resolverFactory resolverFactory
	 * @param {ModuleOptions} param.options options
	 * @param {Object=} param.associatedObjectForCache an object to which the cache will be attached
	 * @param {boolean=} param.layers enable layers
	 */
	constructor({
		context,
		fs,
		resolverFactory,
		options,
		associatedObjectForCache,
		layers = false
	}) {
		super();
		this.hooks = Object.freeze({
			/** @type {AsyncSeriesBailHook<[ResolveData], TODO>} */
			resolve: new AsyncSeriesBailHook(["resolveData"]),
			/** @type {HookMap<AsyncSeriesBailHook<[ResourceDataWithData, ResolveData], true | void>>} */
			resolveForScheme: new HookMap(
				() => new AsyncSeriesBailHook(["resourceData", "resolveData"])
			),
			/** @type {AsyncSeriesBailHook<[ResolveData], TODO>} */
			factorize: new AsyncSeriesBailHook(["resolveData"]),
			/** @type {AsyncSeriesBailHook<[ResolveData], TODO>} */
			beforeResolve: new AsyncSeriesBailHook(["resolveData"]),
			/** @type {AsyncSeriesBailHook<[ResolveData], TODO>} */
			afterResolve: new AsyncSeriesBailHook(["resolveData"]),
			/** @type {AsyncSeriesBailHook<[ResolveData["createData"], ResolveData], TODO>} */
			createModule: new AsyncSeriesBailHook(["createData", "resolveData"]),
			/** @type {SyncWaterfallHook<[Module, ResolveData["createData"], ResolveData], TODO>} */
			module: new SyncWaterfallHook(["module", "createData", "resolveData"]),
			createParser: new HookMap(() => new SyncBailHook(["parserOptions"])),
			parser: new HookMap(() => new SyncHook(["parser", "parserOptions"])),
			createGenerator: new HookMap(
				() => new SyncBailHook(["generatorOptions"])
			),
			generator: new HookMap(
				() => new SyncHook(["generator", "generatorOptions"])
			)
		});
		this.resolverFactory = resolverFactory;
		this.ruleSet = ruleSetCompiler.compile([
			{
				rules: options.defaultRules
			},
			{
				rules: options.rules
			}
		]);
		this.unsafeCache = !!options.unsafeCache;
		this.cachePredicate =
			typeof options.unsafeCache === "function"
				? options.unsafeCache
				: () => true;
		this.context = context || "";
		this.fs = fs;
		this._globalParserOptions = options.parser;
		this._globalGeneratorOptions = options.generator;
		/** @type {Map<string, WeakMap<Object, TODO>>} */
		this.parserCache = new Map();
		/** @type {Map<string, WeakMap<Object, Generator>>} */
		this.generatorCache = new Map();
		/** @type {WeakSet<Module>} */
		this._restoredUnsafeCacheEntries = new WeakSet();

		const cacheParseResource = parseResource.bindCache(
			associatedObjectForCache
		);

		this.hooks.factorize.tapAsync(
			{
				name: "NormalModuleFactory",
				stage: 100
			},
			(resolveData, callback) => {
				this.hooks.resolve.callAsync(resolveData, (err, result) => {
					if (err) return callback(err);

					// Ignored
					if (result === false) return callback();

					// direct module
					if (result instanceof Module) return callback(null, result);

					if (typeof result === "object")
						throw new Error(
							deprecationChangedHookMessage("resolve", this.hooks.resolve) +
								" Returning a Module object will result in this module used as result."
						);

					this.hooks.afterResolve.callAsync(resolveData, (err, result) => {
						if (err) return callback(err);

						if (typeof result === "object")
							throw new Error(
								deprecationChangedHookMessage(
									"afterResolve",
									this.hooks.afterResolve
								)
							);

						// Ignored
						if (result === false) return callback();

						const createData = resolveData.createData;

						this.hooks.createModule.callAsync(
							createData,
							resolveData,
							(err, createdModule) => {
								if (!createdModule) {
									if (!resolveData.request) {
										return callback(new Error("Empty dependency (no request)"));
									}

									createdModule = new NormalModule(createData);
								}

								createdModule = this.hooks.module.call(
									createdModule,
									createData,
									resolveData
								);

								return callback(null, createdModule);
							}
						);
					});
				});
			}
		);
		this.hooks.resolve.tapAsync(
			{
				name: "NormalModuleFactory",
				stage: 100
			},
			(data, callback) => {
				const {
					contextInfo,
					context,
					dependencies,
					request,
					resolveOptions,
					fileDependencies,
					missingDependencies,
					contextDependencies
				} = data;
				const dependencyType =
					(dependencies.length > 0 && dependencies[0].category) || "";
				const loaderResolver = this.getResolver("loader");

				/** @type {ResourceData | undefined} */
				let matchResourceData = undefined;
				/** @type {string} */
				let requestWithoutMatchResource = request;
				const matchResourceMatch = MATCH_RESOURCE_REGEX.exec(request);
				if (matchResourceMatch) {
					let matchResource = matchResourceMatch[1];
					if (matchResource.charCodeAt(0) === 46) {
						// 46 === ".", 47 === "/"
						const secondChar = matchResource.charCodeAt(1);
						if (
							secondChar === 47 ||
							(secondChar === 46 && matchResource.charCodeAt(2) === 47)
						) {
							// if matchResources startsWith ../ or ./
							matchResource = join(this.fs, context, matchResource);
						}
					}
					matchResourceData = {
						resource: matchResource,
						...cacheParseResource(matchResource)
					};
					requestWithoutMatchResource = request.substr(
						matchResourceMatch[0].length
					);
				}

				const firstChar = requestWithoutMatchResource.charCodeAt(0);
				const secondChar = requestWithoutMatchResource.charCodeAt(1);
				const noPreAutoLoaders = firstChar === 45 && secondChar === 33; // startsWith "-!"
				const noAutoLoaders = noPreAutoLoaders || firstChar === 33; // startsWith "!"
				const noPrePostAutoLoaders = firstChar === 33 && secondChar === 33; // startsWith "!!";
				const rawElements = requestWithoutMatchResource
					.slice(
						noPreAutoLoaders || noPrePostAutoLoaders ? 2 : noAutoLoaders ? 1 : 0
					)
					.split(/!+/);
				const unresolvedResource = rawElements.pop();
				const elements = rawElements.map(identToLoaderRequest);

				const resolveContext = {
					fileDependencies,
					missingDependencies,
					contextDependencies
				};

				/** @type {ResourceDataWithData} */
				let resourceData;
				/** @type {string | undefined} */
				const scheme = getScheme(unresolvedResource);

				let loaders;

				const continueCallback = needCalls(2, err => {
					if (err) return callback(err);

					// translate option idents
					try {
						for (const item of loaders) {
							if (typeof item.options === "string" && item.options[0] === "?") {
								const ident = item.options.substr(1);
								if (ident === "[[missing ident]]") {
									throw new Error(
										"No ident is provided by referenced loader. " +
											"When using a function for Rule.use in config you need to " +
											"provide an 'ident' property for referenced loader options."
									);
								}
								item.options = this.ruleSet.references.get(ident);
								if (item.options === undefined) {
									throw new Error(
										"Invalid ident is provided by referenced loader"
									);
								}
								item.ident = ident;
							}
						}
					} catch (e) {
						return callback(e);
					}

					if (!resourceData) {
						// ignored
						return callback(null, dependencies[0].createIgnoredModule(context));
					}

					const userRequest =
						(matchResourceData !== undefined
							? `${matchResourceData.resource}!=!`
							: "") +
						stringifyLoadersAndResource(loaders, resourceData.resource);

					const resourceDataForRules = matchResourceData || resourceData;
					const result = this.ruleSet.exec({
						resource: resourceDataForRules.path,
						realResource: resourceData.path,
						resourceQuery: resourceDataForRules.query,
						resourceFragment: resourceDataForRules.fragment,
						mimetype: matchResourceData ? "" : resourceData.data.mimetype || "",
						dependency: dependencyType,
						descriptionData: matchResourceData
							? undefined
							: resourceData.data.descriptionFileData,
						issuer: contextInfo.issuer,
						compiler: contextInfo.compiler,
						issuerLayer: contextInfo.issuerLayer || ""
					});
					const settings = {};
					const useLoadersPost = [];
					const useLoaders = [];
					const useLoadersPre = [];
					for (const r of result) {
						if (r.type === "use") {
							if (!noAutoLoaders && !noPrePostAutoLoaders) {
								useLoaders.push(r.value);
							}
						} else if (r.type === "use-post") {
							if (!noPrePostAutoLoaders) {
								useLoadersPost.push(r.value);
							}
						} else if (r.type === "use-pre") {
							if (!noPreAutoLoaders && !noPrePostAutoLoaders) {
								useLoadersPre.push(r.value);
							}
						} else if (
							typeof r.value === "object" &&
							r.value !== null &&
							typeof settings[r.type] === "object" &&
							settings[r.type] !== null
						) {
							settings[r.type] = cachedCleverMerge(settings[r.type], r.value);
						} else {
							settings[r.type] = r.value;
						}
					}

					let postLoaders, normalLoaders, preLoaders;

					const continueCallback = needCalls(3, err => {
						if (err) {
							return callback(err);
						}
						const allLoaders = postLoaders;
						if (matchResourceData === undefined) {
							for (const loader of loaders) allLoaders.push(loader);
							for (const loader of normalLoaders) allLoaders.push(loader);
						} else {
							for (const loader of normalLoaders) allLoaders.push(loader);
							for (const loader of loaders) allLoaders.push(loader);
						}
						for (const loader of preLoaders) allLoaders.push(loader);
						let type = settings.type;
						if (!type) {
							const resource =
								(matchResourceData && matchResourceData.resource) ||
								resourceData.resource;
							let match;
							if (
								typeof resource === "string" &&
								(match = /\.webpack\[([^\]]+)\]$/.exec(resource))
							) {
								type = match[1];
							} else {
								type = "javascript/auto";
							}
						}
						const resolveOptions = settings.resolve;
						const layer = settings.layer;
						if (layer !== undefined && !layers) {
							return callback(
								new Error(
									"'Rule.layer' is only allowed when 'experiments.layers' is enabled"
								)
							);
						}
						try {
							Object.assign(data.createData, {
								layer:
									layer === undefined ? contextInfo.issuerLayer || null : layer,
								request: stringifyLoadersAndResource(
									allLoaders,
									resourceData.resource
								),
								userRequest,
								rawRequest: request,
								loaders: allLoaders,
								resource: resourceData.resource,
								matchResource: matchResourceData
									? matchResourceData.resource
									: undefined,
								resourceResolveData: resourceData.data,
								settings,
								type,
								parser: this.getParser(type, settings.parser),
								parserOptions: settings.parser,
								generator: this.getGenerator(type, settings.generator),
								generatorOptions: settings.generator,
								resolveOptions
							});
						} catch (e) {
							return callback(e);
						}
						callback();
					});
					this.resolveRequestArray(
						contextInfo,
						this.context,
						useLoadersPost,
						loaderResolver,
						resolveContext,
						(err, result) => {
							postLoaders = result;
							continueCallback(err);
						}
					);
					this.resolveRequestArray(
						contextInfo,
						this.context,
						useLoaders,
						loaderResolver,
						resolveContext,
						(err, result) => {
							normalLoaders = result;
							continueCallback(err);
						}
					);
					this.resolveRequestArray(
						contextInfo,
						this.context,
						useLoadersPre,
						loaderResolver,
						resolveContext,
						(err, result) => {
							preLoaders = result;
							continueCallback(err);
						}
					);
				});

				this.resolveRequestArray(
					contextInfo,
					context,
					elements,
					loaderResolver,
					resolveContext,
					(err, result) => {
						if (err) return continueCallback(err);
						loaders = result;
						continueCallback();
					}
				);

				// resource with scheme
				if (scheme) {
					resourceData = {
						resource: unresolvedResource,
						data: {},
						path: undefined,
						query: undefined,
						fragment: undefined
					};
					this.hooks.resolveForScheme
						.for(scheme)
						.callAsync(resourceData, data, err => {
							if (err) return continueCallback(err);
							continueCallback();
						});
				}

				// resource without scheme and without path
				else if (/^($|\?)/.test(unresolvedResource)) {
					resourceData = {
						resource: unresolvedResource,
						data: {},
						...cacheParseResource(unresolvedResource)
					};
					continueCallback();
				}

				// resource without scheme and with path
				else {
					const normalResolver = this.getResolver(
						"normal",
						dependencyType
							? cachedSetProperty(
									resolveOptions || EMPTY_RESOLVE_OPTIONS,
									"dependencyType",
									dependencyType
							  )
							: resolveOptions
					);
					this.resolveResource(
						contextInfo,
						context,
						unresolvedResource,
						normalResolver,
						resolveContext,
						(err, resolvedResource, resolvedResourceResolveData) => {
							if (err) return continueCallback(err);
							if (resolvedResource !== false) {
								resourceData = {
									resource: resolvedResource,
									data: resolvedResourceResolveData,
									...cacheParseResource(resolvedResource)
								};
							}
							continueCallback();
						}
					);
				}
			}
		);
	}

	/**
	 * @param {ModuleFactoryCreateData} data data object
	 * @param {function(Error=, ModuleFactoryResult=): void} callback callback
	 * @returns {void}
	 */
	create(data, callback) {
		const dependencies = /** @type {ModuleDependency[]} */ (data.dependencies);
		if (this.unsafeCache) {
			const cacheEntry = unsafeCacheDependencies.get(dependencies[0]);
			if (cacheEntry) {
				const { module } = cacheEntry;
				if (!this._restoredUnsafeCacheEntries.has(module)) {
					const data = unsafeCacheData.get(module);
					module.restoreFromUnsafeCache(data, this);
					this._restoredUnsafeCacheEntries.add(module);
				}
				return callback(null, cacheEntry);
			}
		}
		const context = data.context || this.context;
		const resolveOptions = data.resolveOptions || EMPTY_RESOLVE_OPTIONS;
		const dependency = dependencies[0];
		const request = dependency.request;
		const contextInfo = data.contextInfo;
		const fileDependencies = new LazySet();
		const missingDependencies = new LazySet();
		const contextDependencies = new LazySet();
		/** @type {ResolveData} */
		const resolveData = {
			contextInfo,
			resolveOptions,
			context,
			request,
			dependencies,
			fileDependencies,
			missingDependencies,
			contextDependencies,
			createData: {},
			cacheable: true
		};
		this.hooks.beforeResolve.callAsync(resolveData, (err, result) => {
			if (err) {
				return callback(err, {
					fileDependencies,
					missingDependencies,
					contextDependencies
				});
			}

			// Ignored
			if (result === false) {
				return callback(null, {
					fileDependencies,
					missingDependencies,
					contextDependencies
				});
			}

			if (typeof result === "object")
				throw new Error(
					deprecationChangedHookMessage(
						"beforeResolve",
						this.hooks.beforeResolve
					)
				);

			this.hooks.factorize.callAsync(resolveData, (err, module) => {
				if (err) {
					return callback(err, {
						fileDependencies,
						missingDependencies,
						contextDependencies
					});
				}

				const factoryResult = {
					module,
					fileDependencies,
					missingDependencies,
					contextDependencies
				};

				if (
					this.unsafeCache &&
					resolveData.cacheable &&
					module &&
					module.restoreFromUnsafeCache &&
					this.cachePredicate(module)
				) {
					for (const d of dependencies) {
						unsafeCacheDependencies.set(d, factoryResult);
					}
					if (!unsafeCacheData.has(module)) {
						unsafeCacheData.set(module, module.getUnsafeCacheData());
					}
				}

				callback(null, factoryResult);
			});
		});
	}

	resolveResource(
		contextInfo,
		context,
		unresolvedResource,
		resolver,
		resolveContext,
		callback
	) {
		resolver.resolve(
			contextInfo,
			context,
			unresolvedResource,
			resolveContext,
			(err, resolvedResource, resolvedResourceResolveData) => {
				if (err) {
					return this._resolveResourceErrorHints(
						err,
						contextInfo,
						context,
						unresolvedResource,
						resolver,
						resolveContext,
						(err2, hints) => {
							if (err2) {
								err.message += `
An fatal error happened during resolving additional hints for this error: ${err2.message}`;
								err.stack += `

An fatal error happened during resolving additional hints for this error:
${err2.stack}`;
								return callback(err);
							}
							if (hints && hints.length > 0) {
								err.message += `
${hints.join("\n\n")}`;
							}
							callback(err);
						}
					);
				}
				callback(err, resolvedResource, resolvedResourceResolveData);
			}
		);
	}

	_resolveResourceErrorHints(
		error,
		contextInfo,
		context,
		unresolvedResource,
		resolver,
		resolveContext,
		callback
	) {
		asyncLib.parallel(
			[
				callback => {
					if (!resolver.options.fullySpecified) return callback();
					resolver
						.withOptions({
							fullySpecified: false
						})
						.resolve(
							contextInfo,
							context,
							unresolvedResource,
							resolveContext,
							(err, resolvedResource) => {
								if (!err && resolvedResource) {
									const resource = parseResource(resolvedResource).path.replace(
										/^.*[\\/]/,
										""
									);
									return callback(
										null,
										`Did you mean '${resource}'?
BREAKING CHANGE: The request '${unresolvedResource}' failed to resolve only because it was resolved as fully specified
(probably because the origin is a '*.mjs' file or a '*.js' file where the package.json contains '"type": "module"').
The extension in the request is mandatory for it to be fully specified.
Add the extension to the request.`
									);
								}
								callback();
							}
						);
				},
				callback => {
					if (!resolver.options.enforceExtension) return callback();
					resolver
						.withOptions({
							enforceExtension: false,
							extensions: []
						})
						.resolve(
							contextInfo,
							context,
							unresolvedResource,
							resolveContext,
							(err, resolvedResource) => {
								if (!err && resolvedResource) {
									let hint = "";
									const match = /(\.[^.]+)(\?|$)/.exec(unresolvedResource);
									if (match) {
										const fixedRequest = unresolvedResource.replace(
											/(\.[^.]+)(\?|$)/,
											"$2"
										);
										if (resolver.options.extensions.has(match[1])) {
											hint = `Did you mean '${fixedRequest}'?`;
										} else {
											hint = `Did you mean '${fixedRequest}'? Also note that '${match[1]}' is not in 'resolve.extensions' yet and need to be added for this to work?`;
										}
									} else {
										hint = `Did you mean to omit the extension or to remove 'resolve.enforceExtension'?`;
									}
									return callback(
										null,
										`The request '${unresolvedResource}' failed to resolve only because 'resolve.enforceExtension' was specified.
${hint}
Including the extension in the request is no longer possible. Did you mean to enforce including the extension in requests with 'resolve.extensions: []' instead?`
									);
								}
								callback();
							}
						);
				},
				callback => {
					if (
						/^\.\.?\//.test(unresolvedResource) ||
						resolver.options.preferRelative
					) {
						return callback();
					}
					resolver.resolve(
						contextInfo,
						context,
						`./${unresolvedResource}`,
						resolveContext,
						(err, resolvedResource) => {
							if (err || !resolvedResource) return callback();
							const moduleDirectories = resolver.options.modules
								.map(m => (Array.isArray(m) ? m.join(", ") : m))
								.join(", ");
							callback(
								null,
								`Did you mean './${unresolvedResource}'?
Requests that should resolve in the current directory need to start with './'.
Requests that start with a name are treated as module requests and resolve within module directories (${moduleDirectories}).
If changing the source code is not an option there is also a resolve options called 'preferRelative' which tries to resolve these kind of requests in the current directory too.`
							);
						}
					);
				}
			],
			(err, hints) => {
				if (err) return callback(err);
				callback(null, hints.filter(Boolean));
			}
		);
	}

	resolveRequestArray(
		contextInfo,
		context,
		array,
		resolver,
		resolveContext,
		callback
	) {
		if (array.length === 0) return callback(null, array);
		asyncLib.map(
			array,
			(item, callback) => {
				resolver.resolve(
					contextInfo,
					context,
					item.loader,
					resolveContext,
					(err, result) => {
						if (
							err &&
							/^[^/]*$/.test(item.loader) &&
							!/-loader$/.test(item.loader)
						) {
							return resolver.resolve(
								contextInfo,
								context,
								item.loader + "-loader",
								resolveContext,
								err2 => {
									if (!err2) {
										err.message =
											err.message +
											"\n" +
											"BREAKING CHANGE: It's no longer allowed to omit the '-loader' suffix when using loaders.\n" +
											`                 You need to specify '${item.loader}-loader' instead of '${item.loader}',\n` +
											"                 see https://webpack.js.org/migrate/3/#automatic-loader-module-name-extension-removed";
									}
									callback(err);
								}
							);
						}
						if (err) return callback(err);

						const parsedResult = identToLoaderRequest(result);
						const resolved = {
							loader: parsedResult.loader,
							options:
								item.options === undefined
									? parsedResult.options
									: item.options,
							ident: item.options === undefined ? undefined : item.ident
						};
						return callback(null, resolved);
					}
				);
			},
			callback
		);
	}

	getParser(type, parserOptions = EMPTY_PARSER_OPTIONS) {
		let cache = this.parserCache.get(type);

		if (cache === undefined) {
			cache = new WeakMap();
			this.parserCache.set(type, cache);
		}

		let parser = cache.get(parserOptions);

		if (parser === undefined) {
			parser = this.createParser(type, parserOptions);
			cache.set(parserOptions, parser);
		}

		return parser;
	}

	/**
	 * @param {string} type type
	 * @param {{[k: string]: any}} parserOptions parser options
	 * @returns {Parser} parser
	 */
	createParser(type, parserOptions = {}) {
		parserOptions = mergeGlobalOptions(
			this._globalParserOptions,
			type,
			parserOptions
		);
		const parser = this.hooks.createParser.for(type).call(parserOptions);
		if (!parser) {
			throw new Error(`No parser registered for ${type}`);
		}
		this.hooks.parser.for(type).call(parser, parserOptions);
		return parser;
	}

	getGenerator(type, generatorOptions = EMPTY_GENERATOR_OPTIONS) {
		let cache = this.generatorCache.get(type);

		if (cache === undefined) {
			cache = new WeakMap();
			this.generatorCache.set(type, cache);
		}

		let generator = cache.get(generatorOptions);

		if (generator === undefined) {
			generator = this.createGenerator(type, generatorOptions);
			cache.set(generatorOptions, generator);
		}

		return generator;
	}

	createGenerator(type, generatorOptions = {}) {
		generatorOptions = mergeGlobalOptions(
			this._globalGeneratorOptions,
			type,
			generatorOptions
		);
		const generator = this.hooks.createGenerator
			.for(type)
			.call(generatorOptions);
		if (!generator) {
			throw new Error(`No generator registered for ${type}`);
		}
		this.hooks.generator.for(type).call(generator, generatorOptions);
		return generator;
	}

	getResolver(type, resolveOptions) {
		return this.resolverFactory.get(type, resolveOptions);
	}
}

module.exports = NormalModuleFactory;