webpack/lib/sharing/ProvideSharedModule.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 and Zackary Jackson @ScriptedAlchemy
*/

"use strict";

const AsyncDependenciesBlock = require("../AsyncDependenciesBlock");
const Module = require("../Module");
const RuntimeGlobals = require("../RuntimeGlobals");
const makeSerializable = require("../util/makeSerializable");
const ProvideForSharedDependency = require("./ProvideForSharedDependency");

/** @typedef {import("../../declarations/WebpackOptions").WebpackOptionsNormalized} WebpackOptions */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../ChunkGroup")} ChunkGroup */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../Module").CodeGenerationContext} CodeGenerationContext */
/** @typedef {import("../Module").CodeGenerationResult} CodeGenerationResult */
/** @typedef {import("../Module").LibIdentOptions} LibIdentOptions */
/** @typedef {import("../Module").NeedBuildContext} NeedBuildContext */
/** @typedef {import("../RequestShortener")} RequestShortener */
/** @typedef {import("../ResolverFactory").ResolverWithOptions} ResolverWithOptions */
/** @typedef {import("../WebpackError")} WebpackError */
/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("../util/fs").InputFileSystem} InputFileSystem */

const TYPES = new Set(["share-init"]);

class ProvideSharedModule extends Module {
	/**
	 * @param {string} shareScope shared scope name
	 * @param {string} name shared key
	 * @param {string | false} version version
	 * @param {string} request request to the provided module
	 * @param {boolean} eager include the module in sync way
	 */
	constructor(shareScope, name, version, request, eager) {
		super("provide-module");
		this._shareScope = shareScope;
		this._name = name;
		this._version = version;
		this._request = request;
		this._eager = eager;
	}

	/**
	 * @returns {string} a unique identifier of the module
	 */
	identifier() {
		return `provide module (${this._shareScope}) ${this._name}@${this._version} = ${this._request}`;
	}

	/**
	 * @param {RequestShortener} requestShortener the request shortener
	 * @returns {string} a user readable identifier of the module
	 */
	readableIdentifier(requestShortener) {
		return `provide shared module (${this._shareScope}) ${this._name}@${
			this._version
		} = ${requestShortener.shorten(this._request)}`;
	}

	/**
	 * @param {LibIdentOptions} options options
	 * @returns {string | null} an identifier for library inclusion
	 */
	libIdent(options) {
		return `webpack/sharing/provide/${this._shareScope}/${this._name}`;
	}

	/**
	 * @param {NeedBuildContext} context context info
	 * @param {function(WebpackError=, boolean=): void} callback callback function, returns true, if the module needs a rebuild
	 * @returns {void}
	 */
	needBuild(context, callback) {
		callback(null, !this.buildInfo);
	}

	/**
	 * @param {WebpackOptions} options webpack options
	 * @param {Compilation} compilation the compilation
	 * @param {ResolverWithOptions} resolver the resolver
	 * @param {InputFileSystem} fs the file system
	 * @param {function(WebpackError=): void} callback callback function
	 * @returns {void}
	 */
	build(options, compilation, resolver, fs, callback) {
		this.buildMeta = {};
		this.buildInfo = {
			strict: true
		};

		this.clearDependenciesAndBlocks();
		const dep = new ProvideForSharedDependency(this._request);
		if (this._eager) {
			this.addDependency(dep);
		} else {
			const block = new AsyncDependenciesBlock({});
			block.addDependency(dep);
			this.addBlock(block);
		}

		callback();
	}

	/**
	 * @param {string=} type the source type for which the size should be estimated
	 * @returns {number} the estimated size of the module (must be non-zero)
	 */
	size(type) {
		return 42;
	}

	/**
	 * @returns {Set<string>} types available (do not mutate)
	 */
	getSourceTypes() {
		return TYPES;
	}

	/**
	 * @param {CodeGenerationContext} context context for code generation
	 * @returns {CodeGenerationResult} result
	 */
	codeGeneration({ runtimeTemplate, moduleGraph, chunkGraph }) {
		const runtimeRequirements = new Set([RuntimeGlobals.initializeSharing]);
		const code = `register(${JSON.stringify(this._name)}, ${JSON.stringify(
			this._version || "0"
		)}, ${
			this._eager
				? runtimeTemplate.syncModuleFactory({
						dependency: this.dependencies[0],
						chunkGraph,
						request: this._request,
						runtimeRequirements
				  })
				: runtimeTemplate.asyncModuleFactory({
						block: this.blocks[0],
						chunkGraph,
						request: this._request,
						runtimeRequirements
				  })
		}${this._eager ? ", 1" : ""});`;
		const sources = new Map();
		const data = new Map();
		data.set("share-init", [
			{
				shareScope: this._shareScope,
				initStage: 10,
				init: code
			}
		]);
		return { sources, data, runtimeRequirements };
	}

	serialize(context) {
		const { write } = context;
		write(this._shareScope);
		write(this._name);
		write(this._version);
		write(this._request);
		write(this._eager);
		super.serialize(context);
	}

	static deserialize(context) {
		const { read } = context;
		const obj = new ProvideSharedModule(read(), read(), read(), read(), read());
		obj.deserialize(context);
		return obj;
	}
}

makeSerializable(
	ProvideSharedModule,
	"webpack/lib/sharing/ProvideSharedModule"
);

module.exports = ProvideSharedModule;