import { AsyncSeqToValue } from '../../AsyncSeq';
/**
 * Returns the first element that satisfies the condition. If no element is found that satisfies the condition, it returns the specified default value.
 *
 * ```typescript
 * const result = await fromAsAsync([1,3,5,7]).valueAsync(
 *   findOrDefaultAsync(async i => i % 2 == 0, 9999)
 * );
 *
 * //result: 9999
 * ```
 *
 * @param predicate Condition.
 * @param defaultValue Default value.
 * @typeParam T Source element type.
 * @returns The first element that matches the condition, or the default value.
 * @category Async Values
 */
export declare const findOrDefaultAsync: <T>(predicate?: (arg: T, index: number) => Promise<boolean> | boolean, defaultValue?: T | undefined) => AsyncSeqToValue<T, T | undefined>;