mirror of https://github.com/webpack/webpack.git
114 lines
2.9 KiB
JavaScript
114 lines
2.9 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Joel Denning @joeldenning
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*/
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"use strict";
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const { ConcatSource } = require("webpack-sources");
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const Template = require("./Template");
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/** @typedef {import("./Compilation")} Compilation */
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/**
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* @typedef {Object} SystemMainTemplatePluginOptions
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* @param {string=} name the library name
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*/
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class SystemMainTemplatePlugin {
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/**
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* @param {SystemMainTemplatePluginOptions} options the plugin options
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*/
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constructor(options) {
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this.name = options.name;
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}
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/**
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* @param {Compilation} compilation the compilation instance
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* @returns {void}
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*/
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apply(compilation) {
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const { mainTemplate, chunkTemplate } = compilation;
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const onRenderWithEntry = (source, chunk, hash) => {
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const externals = chunk.getModules().filter(m => m.external);
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// The name this bundle should be registered as with System
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const name = this.name ? `"${this.name}", ` : ``;
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// The array of dependencies that are external to webpack and will be provided by System
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const systemDependencies = JSON.stringify(
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externals.map(m =>
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typeof m.request === "object" ? m.request.amd : m.request
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)
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);
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// The name of the variable provided by System for exporting
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const dynamicExport = `__WEBPACK_DYNAMIC_EXPORT__`;
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// An array of the internal variable names for the webpack externals
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const externalWebpackNames = externals.map(
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m => `__WEBPACK_EXTERNAL_MODULE_${Template.toIdentifier(`${m.id}`)}__`
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);
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// Declaring variables for the internal variable names for the webpack externals
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const externalVarDeclarations =
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externalWebpackNames.length > 0
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? `\n var ${externalWebpackNames.join(", ")};`
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: ``;
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// The system.register format requires an array of setter functions for externals.
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const setters =
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externalWebpackNames.length === 0
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? ""
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: `\n setters: [` +
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externalWebpackNames
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.map(
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external =>
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`\n function(module) {` +
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`\n ${external} = module;` +
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`\n }`
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)
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.join(",") +
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`\n ],`;
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return new ConcatSource(
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`System.register(${name}${systemDependencies}, function(${dynamicExport}) {` +
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externalVarDeclarations +
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`\n return {` +
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setters +
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`\n execute: function() {` +
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`\n ${dynamicExport}(`,
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source,
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`\n )\n }\n };\n});`
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);
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};
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for (const template of [mainTemplate, chunkTemplate]) {
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template.hooks.renderWithEntry.tap(
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"SystemMainTemplatePlugin",
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onRenderWithEntry
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);
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}
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mainTemplate.hooks.globalHashPaths.tap(
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"SystemMainTemplatePlugin",
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paths => {
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if (this.name) {
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paths.push(this.name);
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}
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return paths;
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}
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);
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mainTemplate.hooks.hash.tap("SystemMainTemplatePlugin", hash => {
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hash.update("exports system");
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if (this.name) {
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hash.update(this.name);
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}
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});
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}
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}
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module.exports = SystemMainTemplatePlugin;
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