react-native-track-player/lib/src/interfaces/PlaybackState.d.ts

A fully fledged audio module created for music apps

import { State } from '../constants';
import type { PlaybackErrorEvent } from './events';
export type PlaybackState = {
    state: Exclude<State, State.Error>;
} | {
    state: State.Error;
    error: PlaybackErrorEvent;
};