/**
 * Retry a given promise with gradually increasing delay.
 *
 * @param promise a function that returns a promise to retry
 * @param maxRetries the maximum number of times to retry
 * @param initialDelay the initial value to delay before retrying (in milliseconds)
 * @returns a promise resolving to the result of the promise from the promise generating function, or undefined
 */
export declare function retry<T>(promise: (n: number) => Promise<T>, maxRetries: number, initialDelay?: number): Promise<T | undefined>;
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