/**
 * @copyright Sister Software
 * @license AGPL-3.0
 * @author Teffen Ellis, et al.
 * @file Retry-with-backoff helper for the Who's On First data sources.
 *
 *   This lives apart from `DataSourceCache` because both that module and `PlacetypeDataSource` need
 *   it, and each already imports the other — putting it in either one closes an import cycle.
 */
/**
 * Given a callback, attempt to run it up to `attempts` times.
 *
 * @param attempts Maximum number of tries before the last error is rethrown.
 * @param callback The operation to attempt.
 *
 * @returns The callback's result from the first successful attempt.
 */
export declare function tryWithBackoff<T>(attempts: number, callback: () => T): Promise<T>;
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