jtBaseApp/node_modules/mux.js/scripts/karma.conf.js

const generate = require('videojs-generate-karma-config');

module.exports = function(config) {

  // see https://github.com/videojs/videojs-generate-karma-config
  // for options
  const options = {
    coverage: false,
    browsers(aboutToRun) {
      return aboutToRun.filter(function(launcherName) {
        return !(/^Safari/).test(launcherName);
      });
    },
    browserstackLaunchers(defaults) {
      delete defaults.bsSafariMojave;
      delete defaults.bsSafariElCapitan;

      return defaults;
    }
  };

  config = generate(config, options);

  // any other custom stuff not supported by options here!
};