import { Observable } from 'apollo-client/util/Observable';
export declare function sleep(ms: number): Promise<void>;
export declare type retryInput = {
    func(): boolean;
    timeoutMs: number;
    tick: number;
};
export declare function retry(input: retryInput): Promise<void>;
export declare function start<T>(observable: Observable<{
    data?: {
        [key: string]: T;
    };
}>): Promise<{
    next: (timeoutMs?: number, tick?: number) => Promise<NonNullable<T>>;
    unsub: () => void;
}>;
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