webpack/lib/sharing/resolveMatchedConfigs.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 ModuleNotFoundError = require("../ModuleNotFoundError");
const LazySet = require("../util/LazySet");

/** @typedef {import("enhanced-resolve").ResolveContext} ResolveContext */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../Compilation").FileSystemDependencies} FileSystemDependencies */
/** @typedef {import("../ResolverFactory").ResolveOptionsWithDependencyType} ResolveOptionsWithDependencyType */

/**
 * Defines the matched configs item type used by this module.
 * @template T
 * @typedef {Map<string, T>} MatchedConfigsItem
 */

/**
 * Defines the matched configs type used by this module.
 * @template T
 * @typedef {object} MatchedConfigs
 * @property {MatchedConfigsItem<T>} resolved
 * @property {MatchedConfigsItem<T>} unresolved
 * @property {MatchedConfigsItem<T>} prefixed
 */

/** @type {ResolveOptionsWithDependencyType} */
const RESOLVE_OPTIONS = { dependencyType: "esm" };

/**
 * Returns resolved matchers.
 * @template T
 * @param {Compilation} compilation the compilation
 * @param {[string, T][]} configs to be processed configs
 * @returns {Promise<MatchedConfigs<T>>} resolved matchers
 */
module.exports.resolveMatchedConfigs = (compilation, configs) => {
	/** @type {MatchedConfigsItem<T>} */
	const resolved = new Map();
	/** @type {MatchedConfigsItem<T>} */
	const unresolved = new Map();
	/** @type {MatchedConfigsItem<T>} */
	const prefixed = new Map();
	/** @type {ResolveContext} */
	const resolveContext = {
		fileDependencies: new LazySet(),
		contextDependencies: new LazySet(),
		missingDependencies: new LazySet()
	};
	const resolver = compilation.resolverFactory.get("normal", RESOLVE_OPTIONS);
	const context = compilation.compiler.context;

	return Promise.all(
		// eslint-disable-next-line array-callback-return
		configs.map(([request, config]) => {
			if (/^\.\.?(?:\/|$)/.test(request)) {
				// relative request
				return new Promise((resolve) => {
					resolver.resolve(
						{},
						context,
						request,
						resolveContext,
						(err, result) => {
							if (err || result === false) {
								err = err || new Error(`Can't resolve ${request}`);
								compilation.errors.push(
									new ModuleNotFoundError(null, err, {
										name: `shared module ${request}`
									})
								);
								return resolve(null);
							}
							resolved.set(/** @type {string} */ (result), config);
							resolve(null);
						}
					);
				});
			} else if (/^(?:\/|[a-z]:\\|\\\\)/i.test(request)) {
				// absolute path
				resolved.set(request, config);
			} else if (request.endsWith("/")) {
				// module request prefix
				prefixed.set(request, config);
			} else {
				// module request
				unresolved.set(request, config);
			}
		})
	).then(() => {
		compilation.contextDependencies.addAll(
			/** @type {FileSystemDependencies} */
			(resolveContext.contextDependencies)
		);
		compilation.fileDependencies.addAll(
			/** @type {FileSystemDependencies} */
			(resolveContext.fileDependencies)
		);
		compilation.missingDependencies.addAll(
			/** @type {FileSystemDependencies} */
			(resolveContext.missingDependencies)
		);
		return { resolved, unresolved, prefixed };
	});
};