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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Factory = require("enhanced-resolve").ResolverFactory;
const { HookMap, SyncHook, SyncWaterfallHook } = require("tapable");
const {
cachedCleverMerge,
removeOperations,
resolveByProperty
} = require("./util/cleverMerge");
/** @typedef {import("enhanced-resolve").ResolveOptions} ResolveOptions */
/** @typedef {import("enhanced-resolve").Resolver} Resolver */
/** @typedef {import("../declarations/WebpackOptions").ResolveOptions} WebpackResolveOptions */
/** @typedef {import("../declarations/WebpackOptions").ResolvePluginInstance} ResolvePluginInstance */
/** @typedef {WebpackResolveOptions & {dependencyType?: string, resolveToContext?: boolean }} ResolveOptionsWithDependencyType */
/**
* @typedef {Object} WithOptions
* @property {function(Partial<ResolveOptionsWithDependencyType>): ResolverWithOptions} withOptions create a resolver with additional/different options
*/
/** @typedef {Resolver & WithOptions} ResolverWithOptions */
// need to be hoisted on module level for caching identity
const EMPTY_RESOLVE_OPTIONS = {};
/**
* @param {ResolveOptionsWithDependencyType} resolveOptionsWithDepType enhanced options
* @returns {ResolveOptions} merged options
*/
const convertToResolveOptions = resolveOptionsWithDepType => {
const { dependencyType, plugins, ...remaining } = resolveOptionsWithDepType;
// check type compat
/** @type {Partial<ResolveOptions>} */
const partialOptions = {
...remaining,
plugins:
plugins &&
/** @type {ResolvePluginInstance[]} */ (
plugins.filter(item => item !== "...")
)
};
if (!partialOptions.fileSystem) {
throw new Error(
"fileSystem is missing in resolveOptions, but it's required for enhanced-resolve"
);
}
// These weird types validate that we checked all non-optional properties
const options =
/** @type {Partial<ResolveOptions> & Pick<ResolveOptions, "fileSystem">} */ (
partialOptions
);
return removeOperations(
resolveByProperty(options, "byDependency", dependencyType)
);
};
/**
* @typedef {Object} ResolverCache
* @property {WeakMap<Object, ResolverWithOptions>} direct
* @property {Map<string, ResolverWithOptions>} stringified
*/
module.exports = class ResolverFactory {
constructor() {
this.hooks = Object.freeze({
/** @type {HookMap<SyncWaterfallHook<[ResolveOptionsWithDependencyType]>>} */
resolveOptions: new HookMap(
() => new SyncWaterfallHook(["resolveOptions"])
),
/** @type {HookMap<SyncHook<[Resolver, ResolveOptions, ResolveOptionsWithDependencyType]>>} */
resolver: new HookMap(
() => new SyncHook(["resolver", "resolveOptions", "userResolveOptions"])
)
});
/** @type {Map<string, ResolverCache>} */
this.cache = new Map();
}
/**
* @param {string} type type of resolver
* @param {ResolveOptionsWithDependencyType=} resolveOptions options
* @returns {ResolverWithOptions} the resolver
*/
get(type, resolveOptions = EMPTY_RESOLVE_OPTIONS) {
let typedCaches = this.cache.get(type);
if (!typedCaches) {
typedCaches = {
direct: new WeakMap(),
stringified: new Map()
};
this.cache.set(type, typedCaches);
}
const cachedResolver = typedCaches.direct.get(resolveOptions);
if (cachedResolver) {
return cachedResolver;
}
const ident = JSON.stringify(resolveOptions);
const resolver = typedCaches.stringified.get(ident);
if (resolver) {
typedCaches.direct.set(resolveOptions, resolver);
return resolver;
}
const newResolver = this._create(type, resolveOptions);
typedCaches.direct.set(resolveOptions, newResolver);
typedCaches.stringified.set(ident, newResolver);
return newResolver;
}
/**
* @param {string} type type of resolver
* @param {ResolveOptionsWithDependencyType} resolveOptionsWithDepType options
* @returns {ResolverWithOptions} the resolver
*/
_create(type, resolveOptionsWithDepType) {
/** @type {ResolveOptionsWithDependencyType} */
const originalResolveOptions = { ...resolveOptionsWithDepType };
const resolveOptions = convertToResolveOptions(
this.hooks.resolveOptions.for(type).call(resolveOptionsWithDepType)
);
const resolver = /** @type {ResolverWithOptions} */ (
Factory.createResolver(resolveOptions)
);
if (!resolver) {
throw new Error("No resolver created");
}
/** @type {WeakMap<Partial<ResolveOptionsWithDependencyType>, ResolverWithOptions>} */
const childCache = new WeakMap();
resolver.withOptions = options => {
const cacheEntry = childCache.get(options);
if (cacheEntry !== undefined) return cacheEntry;
const mergedOptions = cachedCleverMerge(originalResolveOptions, options);
const resolver = this.get(type, mergedOptions);
childCache.set(options, resolver);
return resolver;
};
this.hooks.resolver
.for(type)
.call(resolver, resolveOptions, originalResolveOptions);
return resolver;
}
};