message: Fix Flow & eslint issues
diff: @@ -69,8 +69,10 @@ export function isUserSignedIn() {
  * The callback that is invoked when the protocol handler was not detected.
  * @return {void}
  */
  -function detectProtocolLaunch(authRequest: string, successCallback: void, failCallback: void) {
  -
  +function detectProtocolLaunch(
  + authRequest: string,
  + successCallback: () => void,
  + failCallback: () => void) {
  // Create a unique ID used for this protocol detection attempt.
  const echoReplyID = Math.random().toString(36).substr(2, 9)
  const echoReplyKeyPrefix = 'echo-reply-'
  