import { InjectionToken } from '@angular/core';
import type { Observable } from 'rxjs';
export declare const WA_MIDI_MESSAGES: InjectionToken<Observable<MIDIMessageEvent>>;
/**
 * @deprecated: drop in v5.0, use {@link WA_MIDI_MESSAGES}
 */
export declare const MIDI_MESSAGES: InjectionToken<Observable<MIDIMessageEvent>>;