| import { useRef } from "react"; | |
| import { AudioEngine } from "../audio"; | |
| /** | |
| * Lazily construct a single {@link AudioEngine} for the app's lifetime. | |
| * | |
| * The engine wraps Tone's *global* transport + AudioContext and registers | |
| * transport listeners in its constructor, so it must exist exactly once. The | |
| * ref guard guarantees that even if React re-renders the owning component. (We | |
| * deliberately don't wrap the app in <StrictMode>, whose simulated double-mount | |
| * would otherwise create two engines competing over the one global transport.) | |
| */ | |
| export function useAudioEngine(): AudioEngine { | |
| const ref = useRef<AudioEngine | null>(null); | |
| if (ref.current === null) ref.current = new AudioEngine(); | |
| return ref.current; | |
| } | |