mirror of https://github.com/webpack/webpack.git
64 lines
1.5 KiB
JavaScript
64 lines
1.5 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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/** @typedef {import("./Compilation")} Compilation */
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class SetVarMainTemplatePlugin {
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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 {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 varExpression = mainTemplate.getAssetPath(this.varExpression, {
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hash,
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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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for (const template of [mainTemplate, chunkTemplate]) {
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template.hooks.renderWithEntry.tap(
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"SetVarMainTemplatePlugin",
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onRenderWithEntry
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);
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}
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mainTemplate.hooks.hash.tap("SetVarMainTemplatePlugin", hash => {
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hash.update("set var");
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hash.update(`${this.varExpression}`);
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hash.update(`${this.copyObject}`);
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});
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}
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}
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module.exports = SetVarMainTemplatePlugin;
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