webpack/lib/dependencies/ProvidedDependency.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 Florent Cailhol @ooflorent
*/

"use strict";

const Dependency = require("../Dependency");
const InitFragment = require("../InitFragment");
const Template = require("../Template");
const { InlinedUsedName } = require("../optimize/InlineExports");
const makeSerializable = require("../util/makeSerializable");
const { propertyAccess } = require("../util/property");
const ModuleDependency = require("./ModuleDependency");

/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../Dependency").ReferencedExports} ReferencedExports */
/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../ModuleGraphConnection")} ModuleGraphConnection */
/** @typedef {import("../ExportsInfo").ExportInfoName} ExportInfoName */
/** @typedef {import("../javascript/JavascriptParser").Range} Range */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext<[string, ExportInfoName[]]>} ObjectDeserializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext<[string, ExportInfoName[]]>} ObjectSerializerContext */
/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */

class ProvidedDependency extends ModuleDependency {
	/**
	 * Creates an instance of ProvidedDependency.
	 * @param {string} request request
	 * @param {string} identifier identifier
	 * @param {ExportInfoName[]} ids ids
	 * @param {Range} range range
	 */
	constructor(request, identifier, ids, range) {
		super(request);
		/** @type {string} */
		this.identifier = identifier;
		/** @type {string[]} */
		this.ids = ids;
		this.range = range;
		/** @type {undefined | string} */
		this._hashUpdate = undefined;
	}

	get type() {
		return "provided";
	}

	get category() {
		return "esm";
	}

	/**
	 * 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 {ReferencedExports} referenced exports
	 */
	getReferencedExports(moduleGraph, runtime) {
		const ids = this.ids;
		if (ids.length === 0) return Dependency.EXPORTS_OBJECT_REFERENCED;
		return [ids];
	}

	/**
	 * Updates the hash with the data contributed by this instance.
	 * @param {Hash} hash hash to be updated
	 * @param {UpdateHashContext} context context
	 * @returns {void}
	 */
	updateHash(hash, context) {
		if (this._hashUpdate === undefined) {
			this._hashUpdate = this.identifier + (this.ids ? this.ids.join(",") : "");
		}
		hash.update(this._hashUpdate);
	}

	/**
	 * Serializes this instance into the provided serializer context.
	 * @param {ObjectSerializerContext} context context
	 */
	serialize(context) {
		context.write(this.identifier).write(this.ids);
		super.serialize(context);
	}

	/**
	 * Restores this instance from the provided deserializer context.
	 * @param {ObjectDeserializerContext} context context
	 */
	deserialize(context) {
		this.identifier = context.read();
		const c1 = context.rest;
		this.ids = c1.read();
		super.deserialize(c1.rest);
	}
}

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

class ProvidedDependencyTemplate extends ModuleDependency.Template {
	/**
	 * Applies the plugin by registering its hooks on the compiler.
	 * @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,
		{
			runtime,
			runtimeTemplate,
			moduleGraph,
			chunkGraph,
			initFragments,
			runtimeRequirements
		}
	) {
		const dep = /** @type {ProvidedDependency} */ (dependency);
		const connection =
			/** @type {ModuleGraphConnection} */
			(moduleGraph.getConnection(dep));
		const exportsInfo = moduleGraph.getExportsInfo(connection.module);
		const usedName = exportsInfo.getUsedName(dep.ids, runtime);

		const moduleRaw = runtimeTemplate.moduleRaw({
			module: moduleGraph.getModule(dep),
			chunkGraph,
			request: dep.request,
			runtimeRequirements
		});

		const provided = !usedName
			? moduleRaw
			: usedName instanceof InlinedUsedName
				? `(${moduleRaw}, ${usedName.render(
						Template.toNormalComment(
							`inlined export ${propertyAccess(dep.ids)}`
						)
					)})`
				: `${moduleRaw}${propertyAccess(/** @type {string[]} */ (usedName), 0)}`;

		initFragments.push(
			new InitFragment(
				`/* provided dependency */ var ${dep.identifier} = ${provided};\n`,
				InitFragment.STAGE_PROVIDES,
				1,
				`provided ${dep.identifier}`
			)
		);
		source.replace(dep.range[0], dep.range[1] - 1, dep.identifier);
	}
}

ProvidedDependency.Template = ProvidedDependencyTemplate;

module.exports = ProvidedDependency;