SetVarMainTemplatePlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const ConcatSource = require("webpack-sources").ConcatSource;
class SetVarMainTemplatePlugin {
constructor(varExpression, copyObject) {
this.varExpression = varExpression;
this.copyObject = copyObject;
}
apply(compilation) {
const mainTemplate = compilation.mainTemplate;
compilation.templatesPlugin("render-with-entry", (source, chunk, hash) => {
const varExpression = mainTemplate.applyPluginsWaterfall("asset-path", this.varExpression, {
hash,
chunk
});
if(this.copyObject) {
return new ConcatSource(`(function(e, a) { for(var i in a) e[i] = a[i]; }(${varExpression}, `, source, "))");
} else {
const prefix = `${varExpression} =\n`;
return new ConcatSource(prefix, source);
}
});
mainTemplate.plugin("global-hash-paths", (paths) => {
if(this.varExpression) paths.push(this.varExpression);
return paths;
});
mainTemplate.plugin("hash", hash => {
hash.update("set var");
hash.update(`${this.varExpression}`);
hash.update(`${this.copyObject}`);
});
}
}
module.exports = SetVarMainTemplatePlugin;