webpack/lib/DependencyTemplates.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 { DEFAULTS } = require("./config/defaults");
const createHash = require("./util/createHash");

/** @typedef {import("./Compilation").DependencyConstructor} DependencyConstructor */
/** @typedef {import("./DependencyTemplate")} DependencyTemplate */
/** @typedef {import("./util/Hash").HashFunction} HashFunction */

class DependencyTemplates {
	/**
	 * Creates an instance of DependencyTemplates.
	 * @param {HashFunction} hashFunction the hash function to use
	 */
	constructor(hashFunction = DEFAULTS.HASH_FUNCTION) {
		/** @type {Map<DependencyConstructor, DependencyTemplate>} */
		this._map = new Map();
		/** @type {string} */
		this._hash = "31d6cfe0d16ae931b73c59d7e0c089c0";
		/** @type {HashFunction} */
		this._hashFunction = hashFunction;
	}

	/**
	 * Returns template for this dependency.
	 * @param {DependencyConstructor} dependency Constructor of Dependency
	 * @returns {DependencyTemplate | undefined} template for this dependency
	 */
	get(dependency) {
		return this._map.get(dependency);
	}

	/**
	 * Updates value using the provided dependency.
	 * @param {DependencyConstructor} dependency Constructor of Dependency
	 * @param {DependencyTemplate} dependencyTemplate template for this dependency
	 * @returns {void}
	 */
	set(dependency, dependencyTemplate) {
		this._map.set(dependency, dependencyTemplate);
	}

	/**
	 * Updates the hash with the data contributed by this instance.
	 * @param {string} part additional hash contributor
	 * @returns {void}
	 */
	updateHash(part) {
		const hash = createHash(this._hashFunction);
		hash.update(`${this._hash}${part}`);
		this._hash = hash.digest("hex");
	}

	getHash() {
		return this._hash;
	}

	clone() {
		const newInstance = new DependencyTemplates(this._hashFunction);
		newInstance._map = new Map(this._map);
		newInstance._hash = this._hash;
		return newInstance;
	}
}

module.exports = DependencyTemplates;