mirror of https://github.com/webpack/webpack.git
146 lines
3.9 KiB
JavaScript
146 lines
3.9 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 RuntimeGlobals = require("./RuntimeGlobals");
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const Template = require("./Template");
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const JavascriptModulesPlugin = require("./javascript/JavascriptModulesPlugin");
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/** @typedef {import("./Compiler")} Compiler */
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/**
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* @typedef {Object} SystemTemplatePluginOptions
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* @param {string=} name the library name
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*/
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class SystemTemplatePlugin {
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/**
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* @param {SystemTemplatePluginOptions} 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 {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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compiler.hooks.thisCompilation.tap("SystemTemplatePlugin", compilation => {
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compilation.hooks.additionalTreeRuntimeRequirements.tap(
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"SystemTemplatePlugin",
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(chunk, set) => {
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set.add(RuntimeGlobals.returnExportsFromRuntime);
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}
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);
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const hooks = JavascriptModulesPlugin.getCompilationHooks(compilation);
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hooks.render.tap(
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"SystemTemplatePlugin",
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(source, { chunk, chunkGraph }) => {
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if (chunkGraph.getNumberOfEntryModules(chunk) === 0) return source;
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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
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? `${JSON.stringify(compilation.getPath(this.name, { chunk }))}, `
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: "";
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// The array of dependencies that are external to webpack and will be provided by System
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const systemDependencies = JSON.stringify(
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externals.map(m =>
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typeof m.request === "object" && !Array.isArray(m.request)
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? m.request.amd
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: m.request
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)
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);
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// The name of the variable provided by System for exporting
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const dynamicExport = "__WEBPACK_DYNAMIC_EXPORT__";
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// An array of the internal variable names for the webpack externals
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const externalWebpackNames = externals.map(
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m =>
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`__WEBPACK_EXTERNAL_MODULE_${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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);
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hooks.chunkHash.tap(
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"SystemTemplatePlugin",
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(chunk, hash, { chunkGraph }) => {
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if (chunkGraph.getNumberOfEntryModules(chunk) === 0) return;
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hash.update("exports system");
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if (this.name) {
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hash.update(compilation.getPath(this.name, { chunk }));
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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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module.exports = SystemTemplatePlugin;
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