docs: function openBrowser (url) {
    // Attempt to honor this environment variable.
    // It is specific to the operating system.
    // See https://github.com/sindresorhus/opn#app for documentation.
    const browser = process.env.BROWSER;
  
    // Special case: BROWSER="none" will prevent opening completely.
    if (browser === 'none') return false;
  
    // If we're on OS X, the user hasn't specifically
    // requested a different browser, we can try opening
    // Chrome with AppleScript. This lets us reuse an
    // existing tab when possible instead of creating a new one.
    const shouldTryOpenChromeWithAppleScript = (
      process.platform === 'darwin' && (
        typeof browser !== 'string' ||
        browser === OSX_CHROME
      )
    );
  
    if (shouldTryOpenChromeWithAppleScript) {
      try {
        // Try our best to reuse existing tab
        // on OS X Google Chrome with AppleScript
        execSync('ps cax | grep "Google Chrome"');
        execSync(
          'osascript openChrome.applescript ' + url,
          {cwd: __dirname, stdio: 'ignore'}
        );
        return true;
      } catch (err) {
        // Ignore errors.
      }
    }
  
    // Fallback to opn
    // (It will always open new tab)
    try {
      const options = {app: browser};
      opn(url, options).catch(() => {}); // Prevent `unhandledRejection` error.
      return true;
    } catch (err) {
      return false;
    }
  }