No code coverage for Angular 1 Typescript about generator-fountain-webapp HOT 6 OPEN

"compilerOptions": {
  "inlineSourceMap": true,
}

postLoaders : [
  {
    test: /^((?!\.spec\.ts).)*.ts$/,
    exclude: /(node_modules|tests)/,
    loader: 'istanbul-instrumenter' // used to to get the code coverage for TypeScript
  }
];

reporters: ['progress', 'coverage'],
coverageReporter: {
  reporters: [
    {
      dir: 'coverage',
      subdir: '.',
      type: 'json'
    }
  ]
},
plugins: [
  require('karma-coverage'),
]

const remapIstanbul = require('remap-istanbul/lib/gulpRemapIstanbul');
gulp.task('remap-istanbul', function() {
  return gulp.src('coverage/coverage-final.json')
    .pipe(remapIstanbul({
      reports: {
        'json': 'coverage/coverage-final.json',
        'html': 'coverage/html'
      }
    }));
});

gulp.task('test', gulp.series('karma:single-run', 'remap-istanbul'));

npm i --save-dev istanbul-instrumenter-loader karma-coverage remap-istanbul

devtool: false;

postLoaders : [
  {
    test: /\.ts$/,
    exclude: /(node_modules|tests|(.spec\.ts))/,
    loaders: ['istanbul-instrumenter'] // used to to get the code coverage for TypeScript
  }
]