webpack/lib/DelegatedModule.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 { OriginalSource, RawSource } = require("webpack-sources");

const Module = require("./Module");
const WebpackMissingModule = require("./dependencies/WebpackMissingModule");
const DelegatedSourceDependency = require("./dependencies/DelegatedSourceDependency");
const DelegatedExportsDependency = require("./dependencies/DelegatedExportsDependency");

/** @typedef {import("./dependencies/ModuleDependency")} ModuleDependency */
/** @typedef {import("./util/createHash").Hash} Hash */

class DelegatedModule extends Module {
	constructor(sourceRequest, data, type, userRequest, originalRequest) {
		super("javascript/dynamic", null);

		// Info from Factory
		this.sourceRequest = sourceRequest;
		this.request = data.id;
		this.type = type;
		this.userRequest = userRequest;
		this.originalRequest = originalRequest;
		this.delegateData = data;

		// Build info
		this.delegatedSourceDependency = undefined;
	}

	libIdent(options) {
		return typeof this.originalRequest === "string"
			? this.originalRequest
			: this.originalRequest.libIdent(options);
	}

	identifier() {
		return `delegated ${JSON.stringify(this.request)} from ${
			this.sourceRequest
		}`;
	}

	readableIdentifier() {
		return `delegated ${this.userRequest} from ${this.sourceRequest}`;
	}

	needRebuild() {
		return false;
	}

	build(options, compilation, resolver, fs, callback) {
		this.built = true;
		this.buildMeta = Object.assign({}, this.delegateData.buildMeta);
		this.buildInfo = {};
		this.delegatedSourceDependency = new DelegatedSourceDependency(
			this.sourceRequest
		);
		this.addDependency(this.delegatedSourceDependency);
		this.addDependency(
			new DelegatedExportsDependency(this, this.delegateData.exports || true)
		);
		callback();
	}

	source(depTemplates, runtime) {
		const dep = /** @type {DelegatedSourceDependency} */ (this.dependencies[0]);
		const sourceModule = dep.module;
		let str;

		if (!sourceModule) {
			str = WebpackMissingModule.moduleCode(this.sourceRequest);
		} else {
			str = `module.exports = (${runtime.moduleExports({
				module: sourceModule,
				request: dep.request
			})})`;

			switch (this.type) {
				case "require":
					str += `(${JSON.stringify(this.request)})`;
					break;
				case "object":
					str += `[${JSON.stringify(this.request)}]`;
					break;
			}

			str += ";";
		}

		if (this.useSourceMap) {
			return new OriginalSource(str, this.identifier());
		} else {
			return new RawSource(str);
		}
	}

	size() {
		return 42;
	}

	/**
	 * @param {Hash} hash the hash used to track dependencies
	 * @returns {void}
	 */
	updateHash(hash) {
		hash.update(this.type);
		hash.update(JSON.stringify(this.request));
		super.updateHash(hash);
	}
}

module.exports = DelegatedModule;