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type Listener = (delta: 1 | -1) => void;
class LoadingBus {
private listeners: Set<Listener> = new Set();
subscribe(listener: Listener) {
this.listeners.add(listener);
return () => this.listeners.delete(listener);
}
inc() {
this.emit(1);
}
dec() {
this.emit(-1);
}
private emit(delta: 1 | -1) {
this.listeners.forEach((l) => l(delta));
}
}
export const loadingBus = new LoadingBus();