webpack/lib/DependenciesBlock.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support 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 makeSerializable = require("./util/makeSerializable");

/** @typedef {import("./AsyncDependenciesBlock")} AsyncDependenciesBlock */
/** @typedef {import("./ChunkGraph")} ChunkGraph */
/** @typedef {import("./ChunkGroup")} ChunkGroup */
/** @typedef {import("./Dependency")} Dependency */
/** @typedef {import("./Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("./util/Hash")} Hash */

/** @typedef {(d: Dependency) => boolean} DependencyFilterFunction */

class DependenciesBlock {
	constructor() {
		/** @type {Dependency[]} */
		this.dependencies = [];
		/** @type {AsyncDependenciesBlock[]} */
		this.blocks = [];
		/** @type {DependenciesBlock} */
		this.parent = undefined;
	}

	getRootBlock() {
		/** @type {DependenciesBlock} */
		let current = this;
		while (current.parent) current = current.parent;
		return current;
	}

	/**
	 * Adds a DependencyBlock to DependencyBlock relationship.
	 * This is used for when a Module has a AsyncDependencyBlock tie (for code-splitting)
	 *
	 * @param {AsyncDependenciesBlock} block block being added
	 * @returns {void}
	 */
	addBlock(block) {
		this.blocks.push(block);
		block.parent = this;
	}

	/**
	 * @param {Dependency} dependency dependency being tied to block.
	 * This is an "edge" pointing to another "node" on module graph.
	 * @returns {void}
	 */
	addDependency(dependency) {
		this.dependencies.push(dependency);
	}

	/**
	 * @param {Dependency} dependency dependency being removed
	 * @returns {void}
	 */
	removeDependency(dependency) {
		const idx = this.dependencies.indexOf(dependency);
		if (idx >= 0) {
			this.dependencies.splice(idx, 1);
		}
	}

	/**
	 * Removes all dependencies and blocks
	 * @returns {void}
	 */
	clearDependenciesAndBlocks() {
		this.dependencies.length = 0;
		this.blocks.length = 0;
	}

	/**
	 * @param {Hash} hash the hash used to track dependencies
	 * @param {UpdateHashContext} context context
	 * @returns {void}
	 */
	updateHash(hash, context) {
		for (const dep of this.dependencies) {
			dep.updateHash(hash, context);
		}
		for (const block of this.blocks) {
			block.updateHash(hash, context);
		}
	}

	serialize({ write }) {
		write(this.dependencies);
		write(this.blocks);
	}

	deserialize({ read }) {
		this.dependencies = read();
		this.blocks = read();
		for (const block of this.blocks) {
			block.parent = this;
		}
	}
}

makeSerializable(DependenciesBlock, "webpack/lib/DependenciesBlock");

module.exports = DependenciesBlock;