import { Context, Service } from 'koishi';
import { Semaphore } from '@shopify/semaphore';
import { Worker } from 'node:worker_threads';
interface WorkerInstance {
    worker: Worker;
    busy: boolean;
}
export declare class SilkService extends Service {
    protected semaphore: Semaphore;
    protected workers: WorkerInstance[];
    protected workerUsed: number;
    constructor(ctx: Context);
    encode(input: ArrayBufferView | ArrayBuffer, sampleRate: number): Promise<any>;
    decode(input: ArrayBufferView | ArrayBuffer, sampleRate: number): Promise<any>;
    getDuration(data: ArrayBufferView | ArrayBuffer, frameMs?: number): number;
    isWav(data: ArrayBufferView | ArrayBuffer): boolean;
    getWavFileInfo(data: ArrayBufferView | ArrayBuffer): import("silk-wasm").WavFileInfo;
    isSilk(data: ArrayBufferView | ArrayBuffer): boolean;
    private postMessage;
}
export {};