webpack/lib/dependencies/ModuleDecoratorDependency.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 Dependency = require("../Dependency");
const InitFragment = require("../InitFragment");
const RuntimeGlobals = require("../RuntimeGlobals");
const makeSerializable = require("../util/makeSerializable");
const NullDependency = require("./NullDependency");

/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../Dependency").ReferencedExport} ReferencedExport */
/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../DependencyTemplates")} DependencyTemplates */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */

class ModuleDecoratorDependency extends NullDependency {
	/**
	 * @param {string} decorator the decorator requirement
	 * @param {boolean} allowExportsAccess allow to access exports from module
	 */
	constructor(decorator, allowExportsAccess) {
		super();
		this.decorator = decorator;
		this.allowExportsAccess = allowExportsAccess;
		this._hashUpdate = undefined;
	}

	/**
	 * @returns {string} a display name for the type of dependency
	 */
	get type() {
		return "module decorator";
	}

	get category() {
		return "self";
	}

	/**
	 * @returns {string | null} an identifier to merge equal requests
	 */
	getResourceIdentifier() {
		return `self`;
	}

	/**
	 * Returns list of exports referenced by this dependency
	 * @param {ModuleGraph} moduleGraph module graph
	 * @param {RuntimeSpec} runtime the runtime for which the module is analysed
	 * @returns {(string[] | ReferencedExport)[]} referenced exports
	 */
	getReferencedExports(moduleGraph, runtime) {
		return this.allowExportsAccess
			? Dependency.EXPORTS_OBJECT_REFERENCED
			: Dependency.NO_EXPORTS_REFERENCED;
	}

	/**
	 * Update the hash
	 * @param {Hash} hash hash to be updated
	 * @param {UpdateHashContext} context context
	 * @returns {void}
	 */
	updateHash(hash, context) {
		if (this._hashUpdate === undefined) {
			this._hashUpdate = `${this.decorator}${this.allowExportsAccess}`;
		}
		hash.update(this._hashUpdate);
	}

	serialize(context) {
		const { write } = context;
		write(this.decorator);
		write(this.allowExportsAccess);
		super.serialize(context);
	}

	deserialize(context) {
		const { read } = context;
		this.decorator = read();
		this.allowExportsAccess = read();
		super.deserialize(context);
	}
}

makeSerializable(
	ModuleDecoratorDependency,
	"webpack/lib/dependencies/ModuleDecoratorDependency"
);

ModuleDecoratorDependency.Template = class ModuleDecoratorDependencyTemplate extends (
	NullDependency.Template
) {
	/**
	 * @param {Dependency} dependency the dependency for which the template should be applied
	 * @param {ReplaceSource} source the current replace source which can be modified
	 * @param {DependencyTemplateContext} templateContext the context object
	 * @returns {void}
	 */
	apply(
		dependency,
		source,
		{ module, chunkGraph, initFragments, runtimeRequirements }
	) {
		const dep = /** @type {ModuleDecoratorDependency} */ (dependency);
		runtimeRequirements.add(RuntimeGlobals.moduleLoaded);
		runtimeRequirements.add(RuntimeGlobals.moduleId);
		runtimeRequirements.add(RuntimeGlobals.module);
		runtimeRequirements.add(dep.decorator);
		initFragments.push(
			new InitFragment(
				`/* module decorator */ ${module.moduleArgument} = ${dep.decorator}(${module.moduleArgument});\n`,
				InitFragment.STAGE_PROVIDES,
				0,
				`module decorator ${chunkGraph.getModuleId(module)}`
			)
		);
	}
};

module.exports = ModuleDecoratorDependency;