import { type OnPreProcessingChecksFailed, type OnComplete } from '../camera/init';
export default class CallbackHandler {
    private static instance;
    private onComplete;
    private onPreProcessingChecksFailedCallback;
    private constructor();
    static getInstance(): CallbackHandler;
    setOnComplete(callback: (response: OnComplete) => void): void;
    callOnComplete(response: OnComplete): void;
    setOnPreProcessingChecksFailedCallback(callback: (response: OnPreProcessingChecksFailed) => void): void;
    callOnPreProcessingChecksFailed(response: OnPreProcessingChecksFailed): void;
    destroy(): void;
}
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