message: fixed platform ts
diff: @@ -7,9 +7,9 @@ export const ANDROID: OS = OS.ANDROID;
  export const IOS: OS = OS.IOS;
  let ua: string;
  -let platformName: string;
  +let platformName: OS;
  -export function platform (useragent?: string): string {
  +export function platform (useragent?: string): OS {
  if (!ua) {
  ua = useragent || (navigator && navigator.userAgent) || '';
  }
  