// karma.conf.js
const path = require('path');

module.exports = function (config) {

  config.set({

    // ... rest of karma config

    // anything named karma-* is normally auto included so you probably dont need this
    plugins: ['karma-coverage-istanbul-reporter'],

    reporters: ['coverage-istanbul'],

    // any of these options are valid: https://github.com/istanbuljs/istanbul-api/blob/47b7803fbf7ca2fb4e4a15f3813a8884891ba272/lib/config.js#L33-L38
    coverageIstanbulReporter: {

       // reports can be any that are listed here: https://github.com/istanbuljs/istanbul-reports/tree/590e6b0089f67b723a1fdf57bc7ccc080ff189d7/lib
      reports: ['html', 'lcovonly', 'text-summary'],

       // base output directory. If you include %browser% in the path it will be replaced with the karma browser name
      dir: path.join(__dirname, 'coverage'),

       // if using webpack and pre-loaders, work around webpack breaking the source path
      fixWebpackSourcePaths: true,

       // Most reporters accept additional config options. You can pass these through the `report-config` option
      'report-config': {

        // all options available at: https://github.com/istanbuljs/istanbul-reports/blob/590e6b0089f67b723a1fdf57bc7ccc080ff189d7/lib/html/index.js#L135-L137
        html: {
          // outputs the report in ./coverage/html
          subdir: 'html'
        }

      },

       // enforce percentage thresholds
       // anything under these percentages will cause karma to fail with an exit code of 1 if not running in watch mode
      thresholds: {
        statements: 100,
        lines: 100,
        branches: 100,
        functions: 100
      }

    }

  });

}