import { DeadOnClock } from './deadon';
export declare function initDemoEnv(): Promise<{
    audioCtx: AudioContext;
    clock: DeadOnClock;
    midiOutputs: MIDIOutput[];
    midiAccess: MIDIAccess | null;
    midiInterval: number;
    indicators: HTMLElement[];
    swingMs: number;
    playKick: (at: number) => void;
    playHat: (at: number) => void;
}>;