After migrate few files to .ts test coverage does not including .ts files, only js

After I migrate few files from .js to .ts They no longer append in coverage summary from karma

Test are wrote in .js and importing some files like .ts, Test are working, .ts files are tested but, there is no info about coverage in all .ts files

This is my karma configuration

var BROWSERS = ['Safari', 'Chrome']

config.set({
    frameworks: ['jasmine-ajax', 'jasmine'],
    reporters:['mocha'],
    files: [
      { pattern: 'test/**/*_test.js', watched: false }
    ],
    colors: true,
    autoWatch: true,
    singleRun: false,
    coverageReporter: {
      dir: '.',
      reporters: [
        { type: 'text', subdir: 'coverage' },
        { type: 'html', subdir: 'coverage' },
        { type: 'lcovonly', subdir: '.', file: 'lcov.info' }
      ]
    },
    preprocessors: {
      'test/**/*_test.js': ['webpack', 'sourcemap']
    },
    webpack: build.config('test'),
    webpackMiddleware: {
      stats: 'errors-only'
    },
    browsers: BROWSERS,
    client: {
      captureConsole: false,
      mocha: {
        bail: true
      }
    }
  })

I expect to coverage includes .ts files