132 lines
3.3 KiB
JavaScript
132 lines
3.3 KiB
JavaScript
/*
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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 ExternalModule = require("./ExternalModule");
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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 chunkGraph = compilation.chunkGraph;
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const modules = chunkGraph
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.getChunkModules(chunk)
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.filter(m => m instanceof ExternalModule);
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const externals = /** @type {ExternalModule[]} */ (modules);
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// The name this bundle should be registered as with System
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const name = this.name ? `${JSON.stringify(this.name)}, ` : "";
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// The array of dependencies that are external to webpack and will be provided by System
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const systemDependencies = JSON.stringify(
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externals.map(m =>
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typeof m.request === "object" && !Array.isArray(m.request)
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? m.request.amd
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: m.request
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)
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);
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// The name of the variable provided by System for exporting
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const dynamicExport = "__WEBPACK_DYNAMIC_EXPORT__";
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// An array of the internal variable names for the webpack externals
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const externalWebpackNames = externals.map(
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m =>
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`__WEBPACK_EXTERNAL_MODULE_${Template.toIdentifier(
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`${chunkGraph.getModuleId(m)}`
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)}__`
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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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? `var ${externalWebpackNames.join(", ")};`
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: "";
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// The system.register format requires an array of setter functions for externals.
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const setters =
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externalWebpackNames.length === 0
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? ""
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: Template.asString([
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"setters: [",
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Template.indent(
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externalWebpackNames
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.map(external =>
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Template.asString([
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"function(module) {",
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Template.indent(`${external} = module;`),
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"}"
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])
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)
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.join(",\n")
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),
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"],"
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]);
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return new ConcatSource(
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Template.asString([
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`System.register(${name}${systemDependencies}, function(${dynamicExport}) {`,
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Template.indent([
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externalVarDeclarations,
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"return {",
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Template.indent([
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setters,
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"execute: function() {",
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Template.indent(`${dynamicExport}(`)
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])
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])
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]) + "\n",
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source,
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"\n" +
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Template.asString([
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Template.indent([
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Template.indent([Template.indent([");"]), "}"]),
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"};"
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]),
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"})"
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])
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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.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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