/**
 * Repeatedly calls the executor until the later returns a resolved promise
 * or it has reached the maximum number or retries.
 * A retry is attempted after getting an exception from the executor and once
 * past the given delay (starting at the time of the exception).
 *
 * @param retries Maximum number of retries.
 * @param delayMs Delay in milliseconds between getting an exception and attempting a retry.
 * @param executor The function to run. It should return a promise and raise an exception
 *                 if there unsuccessful.
 * @param opt.onResolved Called with the value returned by the resolved promise.
 * @param opt.onRejected Called when all retries have failed.
 * @param opt.onWillRetry Called before scheduling a retry.
 */
export declare function exponentialBackOff(retries: number, delayMs: number, executor: () => Promise<unknown>, opt?: {
    onResolved?: (result: unknown) => void;
    onRejected?: (error: unknown) => void;
    onWillRetry?: (delay: number, retriesLeft: number, error: unknown) => void;
}): Promise<void>;
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