title: Karma-coverage checks test coverage in JS files instead of TS in Angular 2
body: <p>I check test coverage in TypeScript files via Istanbul. And I need to set test threshold via karma-coverage.Istanbul's reports don't match karma-coverage reports (I use Angular-cli) because karma-coverage checks test coverage in JavaScript files instead of TypeScript. I used other plugins such as karma-threshold-reporter,istanbul-threshold-checker but result the same. How can I resolve it?  </p>
  
  <p><a href="https://i.stack.imgur.com/2hwnB.png" rel="nofollow noreferrer">report generate for typeScript files</a></p>
  
  <p><a href="https://i.stack.imgur.com/Y4xfc.png" rel="nofollow noreferrer">report generate for JS files</a></p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>module.exports = function (config) {
    config.set({
      basePath: '',
      frameworks: ['jasmine', 'angular-cli'],
      plugins: [
        require('karma-jasmine'),
        require('karma-chrome-launcher'),
        require('karma-remap-istanbul'),
        require('karma-coverage'),
        require('angular-cli/plugins/karma')
      ],
      files: [
        { pattern: './src/test.ts', watched: false }
      ],
      preprocessors: {
        './src/test.ts': ['angular-cli']
      },
      remapIstanbulReporter: {
        reports: {
          html: 'coverage',
          lcovonly: './coverage/coverage.lcov'
        }
      },
      coverageReporter: {
        dir: 'coverage/',
        reporters: [
          {type: 'text-summary'},
          {type: 'html'}
        ],
        check: {
          global: {
            statements: 70,
            branches: 70,
            functions: 70,
            lines: 50
          }
        }
      },
  
      angularCli: {
        config: './angular-cli.json',
        environment: 'dev'
      },
      reporters: ['progress', 'karma-remap-istanbul', 'coverage'],
      port: 9876,
      colors: true,
      logLevel: config.LOG_INFO,
      autoWatch: true,
      browsers: ['Chrome'],
      singleRun: false
    });
  };</code></pre>
  </div>
  </div>
  </p>