import { AsyncSeqToValue } from '../../AsyncSeq';
/**
 * Returns the first element that satisfies the condition. If no element satisfying the condition is found, an error is thrown.
 *
 * ```typescript
 * const result = await fromAsAsync([1,2,3,4]).valueAsync(
 *   findAsync(async i => i % 2 == 0)
 * );
 *
 * //result: 2
 * ```
 *
 * @param predicate Condition.
 * @typeParam T Source element type.
 * @returns The first element that matches the condition
 * @category Async Values
 */
export declare const findAsync: <T>(predicate?: (arg: T, index: number) => Promise<boolean> | boolean) => AsyncSeqToValue<T, T>;