Troubleshooting Angular 2 Karma Error: Module Parse Failed due to missing loader for file type

I'm currently configuring Karma for my Angular 2 application and I seem to be facing an issue with a missing plugin. Could anyone provide assistance with this matter? I am utilizing the following repository as a reference: https://github.com/AngularClass/angular2-webpack-starter. Below are the dev-dependencies listed in my Karma setup:

"istanbul": "^0.4.5",
    "jasmine-core": "^2.4.1",
    "json-loader": "^0.5.4",
    "karma": "^1.3.0",
    "karma-chrome-launcher": "^2.0.0",
    "karma-coverage": "^1.1.1",
    "karma-istanbul-reporter": "0.0.1",
    "karma-jasmine": "^1.0.2",
    "karma-mocha-reporter": "^2.2.0",
    "karma-remap-coverage": "^0.1.2",
    "karma-sourcemap-loader": "^0.3.7",
    "karma-webpack": "^1.8.0",
    "lodash-webpack-plugin": "^0.10.2",
    "npm-scripts-info": "^0.3.6",
    "raw-loader": "0.5.1",
    "rimraf": "^2.5.2",
    "source-map": "^0.5.6",
    "source-map-loader": "^0.1.5",

Additionally, here is a snippet from my karma.conf.js file:

var webpackConfig = require('./webpack.test');

module.exports = function (config) {
  var _config = {
    basePath: '',
    // more configuration settings...
};
  config.set(_config);
};

The error message that appears when running the code is:

Chrome 54.0.2840 (Windows 7 0.0.0) ERROR
  Uncaught Error: Module parse failed: {location}\src\app\app.component.spec.ts Unexpected t
oken (13:57)
  You may need an appropriate loader to handle this file type.
  |     ]}));
  |
  |   it('should have a state', inject([ AppComponent ], (app: AppComponent) => {
  |     expect(app.state).toEqual('blank');
  |   }));

This error is seen at config/karma-test-shim.js:69437

testingangulartypescriptkarma-jasmine

Answer №1

It seems like this situation mirrors a scenario discussed in a related post.

To resolve the issue, consider implementing the following modification in your webpack.test.js (webpack configuration file):

Try adjusting the 'awesome-typescript-loader' as shown below:

{
   loader: 'awesome-typescript-loader?presets[]=es2017',
   options: { configFileName: helpers.root('src', 'tsconfig.json') }
}

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