webpack/lib/DelegatedModuleFactoryPlugin.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 DelegatedModule = require("./DelegatedModule");

// options.source
// options.type
// options.context
// options.scope
// options.content
// options.associatedObjectForCache
class DelegatedModuleFactoryPlugin {
	constructor(options) {
		this.options = options;
		options.type = options.type || "require";
		options.extensions = options.extensions || ["", ".js", ".json", ".wasm"];
	}

	apply(normalModuleFactory) {
		const scope = this.options.scope;
		if (scope) {
			normalModuleFactory.hooks.factorize.tapAsync(
				"DelegatedModuleFactoryPlugin",
				(data, callback) => {
					const [dependency] = data.dependencies;
					const { request } = dependency;
					if (request && request.startsWith(`${scope}/`)) {
						const innerRequest = "." + request.substr(scope.length);
						let resolved;
						if (innerRequest in this.options.content) {
							resolved = this.options.content[innerRequest];
							return callback(
								null,
								new DelegatedModule(
									this.options.source,
									resolved,
									this.options.type,
									innerRequest,
									request
								)
							);
						}
						for (let i = 0; i < this.options.extensions.length; i++) {
							const extension = this.options.extensions[i];
							const requestPlusExt = innerRequest + extension;
							if (requestPlusExt in this.options.content) {
								resolved = this.options.content[requestPlusExt];
								return callback(
									null,
									new DelegatedModule(
										this.options.source,
										resolved,
										this.options.type,
										requestPlusExt,
										request + extension
									)
								);
							}
						}
					}
					return callback();
				}
			);
		} else {
			normalModuleFactory.hooks.module.tap(
				"DelegatedModuleFactoryPlugin",
				module => {
					const request = module.libIdent(this.options);
					if (request) {
						if (request in this.options.content) {
							const resolved = this.options.content[request];
							return new DelegatedModule(
								this.options.source,
								resolved,
								this.options.type,
								request,
								module
							);
						}
					}
					return module;
				}
			);
		}
	}
}
module.exports = DelegatedModuleFactoryPlugin;