code: function configureBrowsers (config) {
    let isWindows = /^win/.test(process.platform) || process.env.WINDOWS === "true";
    let isMac = /^darwin/.test(process.platform);
    let isLinux = !isMac && !isWindows;
    let isCI = process.env.CI === "true";
  
    if (isCI) {
      if (isWindows) {
        // IE and Edge aren"t available in CI, so use SauceLabs
        configureSauceLabs(config);
      }
      else if (isMac) {
        config.browsers = ["FirefoxHeadless", "ChromeHeadless", "Safari"];
      }
      else if (isLinux) {
        config.browsers = ["FirefoxHeadless", "ChromeHeadless"];
      }
    }
    else if (isMac) {
      config.browsers = ["Firefox", "Chrome", "Safari"];
    }
    else if (isLinux) {
      config.browsers = ["Firefox", "Chrome"];
    }
    else if (isWindows) {
      config.browsers = ["Firefox", "Chrome", "Edge"];
    }
  }
docs: Configures the browsers for the current platform