CompatibilityPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const ConstDependency = require("./dependencies/ConstDependency");
const NullFactory = require("./NullFactory");
const jsonLoaderPath = require.resolve("json-loader");
const matchJson = /\.json$/i;
class CompatibilityPlugin {
apply(compiler) {
compiler.plugin("compilation", (compilation, params) => {
compilation.dependencyFactories.set(ConstDependency, new NullFactory());
compilation.dependencyTemplates.set(ConstDependency, new ConstDependency.Template());
params.normalModuleFactory.plugin("parser", (parser, parserOptions) => {
if(typeof parserOptions.browserify !== "undefined" && !parserOptions.browserify)
return;
parser.plugin("call require", (expr) => {
// support for browserify style require delegator: "require(o, !0)"
if(expr.arguments.length !== 2) return;
const second = parser.evaluateExpression(expr.arguments[1]);
if(!second.isBoolean()) return;
if(second.asBool() !== true) return;
const dep = new ConstDependency("require", expr.callee.range);
dep.loc = expr.loc;
if(parser.state.current.dependencies.length > 1) {
const last = parser.state.current.dependencies[parser.state.current.dependencies.length - 1];
if(last.critical && last.request === "." && last.userRequest === "." && last.recursive)
parser.state.current.dependencies.pop();
}
parser.state.current.addDependency(dep);
return true;
});
});
params.normalModuleFactory.plugin("after-resolve", (data, done) => {
// if this is a json file and there are no loaders active, we use the json-loader in order to avoid parse errors
// @see https://github.com/webpack/webpack/issues/3363
if(matchJson.test(data.request) && data.loaders.length === 0) {
data.loaders.push({
loader: jsonLoaderPath
});
}
done(null, data);
});
});
}
}
module.exports = CompatibilityPlugin;