browsers.config.js

const osType = require('os').type();

const isWin = osType === 'Windows_NT';
const isDarwin = osType === 'Darwin'; /* macOS, iOS, iPadOS */

const defaultBrowsers = ['chrome', 'firefox'];
const availableBrowsers = ['chrome', 'firefox', 'opera'];

// do not perform browser check as it is slow and never required

if (isWin) {
  availableBrowsers.push('ie');
}

if (isDarwin) {
  // defaultBrowsers.push('safari'); /* there is a bug https://github.com/karma-runner/karma-safari-launcher/issues/29, so do not include it by default  */
  availableBrowsers.push('safari');
}

module.exports = {
  defaultBrowsers,
  availableBrowsers
};