mirror of https://github.com/webpack/webpack.git
78 lines
2.0 KiB
JavaScript
78 lines
2.0 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const { ConcatSource } = require("webpack-sources");
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const RuntimeGlobals = require("./RuntimeGlobals");
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const JavascriptModulesPlugin = require("./javascript/JavascriptModulesPlugin");
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/** @typedef {import("./Compiler")} Compiler */
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class SetVarTemplatePlugin {
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/**
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* @param {string} varExpression the accessor where the library is exported
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* @param {boolean} copyObject specify copying the exports
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*/
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constructor(varExpression, copyObject) {
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/** @type {string} */
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this.varExpression = varExpression;
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/** @type {boolean} */
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this.copyObject = copyObject;
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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("SetVarTemplatePlugin", compilation => {
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compilation.hooks.additionalTreeRuntimeRequirements.tap(
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"LibraryTemplatePlugin",
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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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"SetVarTemplatePlugin",
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(source, { chunk, chunkGraph }) => {
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if (chunkGraph.getNumberOfEntryModules(chunk) === 0) return source;
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const varExpression = compilation.getPath(this.varExpression, {
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chunk
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});
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if (this.copyObject) {
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return new ConcatSource(
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`(function(e, a) { for(var i in a) e[i] = a[i]; }(${varExpression}, `,
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source,
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"))"
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);
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} else {
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const prefix = `${varExpression} =\n`;
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return new ConcatSource(prefix, source);
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}
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}
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);
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hooks.chunkHash.tap(
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"SetVarTemplatePlugin",
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(chunk, hash, { chunkGraph }) => {
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if (chunkGraph.getNumberOfEntryModules(chunk) === 0) return;
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hash.update("set var");
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const varExpression = compilation.getPath(this.varExpression, {
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chunk
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});
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hash.update(`${varExpression}`);
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hash.update(`${this.copyObject}`);
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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 = SetVarTemplatePlugin;
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