How can I call an async cleanup function in useEffect?
useEffect(() => {
return () => Voice.destroy().then(Voice.removeAllListeners);
}, []);
The EffectCallback expects void, not Promise<void>
You can wrap the body in curly braces, because currently it returns the Promise (this is what happens when you omit the curly braces, a one line return), which makes your cleanup function return a Promise<void>. With curly braces, it will be just the body of the function and not an implied return statement:
useEffect(() => {
return () => {
Voice.destroy().then(Voice.removeAllListeners)
};
}, []);