Allow for karma.conf.ts (TypeScript) when using cli

When running node_modules/.bin/karma start karma.conf.ts (1) (written in TypeScript) I get:

ERROR [config]: Invalid config file!
  SyntaxError: Unexpected reserved word
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:413:25)
    at Object.Module._extensions..js (module.js:452:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.parseConfig (node_modules/karma/lib/config.js:276:22)
    at new Server (node_modules/karma/lib/server.js:56:20)
    at Object.exports.run (node_modules/karma/lib/cli.js:231:7)
    at Object.<anonymous> (node_modules/karma/bin/karma:3:23)
    at Module._compile (module.js:434:26)
    at Object.Module._extensions..js (module.js:452:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:475:10)

Also it does not seem to automatically detect karma.conf.ts when running node_modules/.bin/karma start:

[karma]: No captured browser, open http://localhost:9876/
INFO [karma]: Karma v0.13.15 server started at http://localhost:9876/
INFO [Chrome]: Connected on socket 9S-HxtcaP6-xFCRfAAAA with id manual-8425
Chrome ERROR
  You need to include some adapter that implements __karma__.start method!

On the other hand when running the task using gulp and the same karma.conf.ts:

// File gulpfile.ts (written in TypeScript)
import * as gulp from 'gulp';
import * as karma from 'karma';

function runKarma(done): void {
  const config = {
    configFile: __dirname + '/karma.conf.ts'
  };

  const server = new karma.Server(config, done);
  server.start();
}

gulp.task('test', done => runKarma(done));

Everything works as expected so I suspect code specific to the cli to not support TypeScript.

(1) or $(npm bin)/karma start karma.conf.ts

[aj-r]

This works for me using TypeScript 2:

npm install -D typescript ts-node karma @types/karma

In package.json:

{
  "scripts": {
    "test": "ts-node node_modules/karma/bin/karma start karma.conf.ts",
  },
}

Also don’t forget to add this to your karma config file:

    mime: {
      "text/x-typescript": ["ts", "tsx"],
    },

Then run npm test

[caseyhoward]

Even with this merged (https://github.com/karma-runner/karma/pull/2224) I still can’t figure out how to use ES6 modules. Is this supported. I get the following error:

11 07 2016 11:23:38.903:ERROR [config]: Invalid config file!
  SyntaxError: Unexpected reserved word