transpiler

I have this webpack.config.js : module.exports = { entry: './src/admin/client/index.jsx', output: { filename: './src/admin/client/static/js/app.js' }, loaders: [ { test: /\.jsx?$/, loader: 'babel', exclude: /node_modules/, query: { optional: ['runtime'] } } ], resolve: { extensions: ['', '.js', '.jsx'] } }; ...yet I still get this error: $ webpack -v Hash: 2a9a40224beb025cb433 Version: webpack 1.10.5 Time: 44ms [0] ./src/admin/client/index.jsx 0 bytes [built] [failed] ERROR in ./src/admin/client/index.jsx Module parse failed: /project/src/admin/client/index.jsx Line 1: Unexpected reserved word

Javascript seems to become popular as an implementation language for other programming languages. The article Lightweight compilation of (C)LP to JavaScript. ICLP 2012 drew my attention on this. There are a lot of proof-of-concept prototypes for Prolog systems written in Javascript around on the Web. What are current, actively maintained, preferably ISO conforming Prolog systems written in Javascript? The only Prolog in JavaScript I know is YieldProlog , but I haven't tried it extensively, just the code available in QueryEditor . I was hoping than using the yield construct it was lightweight

I am trying to extend Error with ES6 and Babel. It isn't working out. class MyError extends Error { constructor(m) { super(m); } } var error = new Error("ll"); var myerror = new MyError("ll"); console.log(error.message) //shows up correctly console.log(myerror.message) //shows empty string The Error object never get the right message set. Try in Babel REPL . Now I have seen a few solutions on SO ( for example here ), but they all seem very un-ES6-y. How to do it in a nice, ES6 way? (That is working in Babel) Based on Karel Bílek's answer, I'd make a small change to the constructor : class