Upgrade to TypeScript 4.1

Summary:
allow-large-files

Upgrade to TypeScript 4.1

Reviewed By: nikoant

Differential Revision: D25122073

fbshipit-source-id: 7d2bc6f97595c825c9527b0c6ecab07698d5f981

desktop/app/src/devices/AndroidDevice.tsx

@@ -170,7 +170,7 @@ export default class AndroidDevice extends BaseDevice {
         (_) =>
           new Promise((resolve, reject) => {
             this.adb.pull(this.serial, recordingLocation).then((stream) => {
-              stream.on('end', resolve);
+              stream.on('end', resolve as () => void);
               stream.on('error', reject);
               stream.pipe(createWriteStream(destination));
             });