import { IterableX } from '../../iterable/iterablex';
/**
 * @ignore
 */
export declare function findProto<T, S extends T>(this: IterableX<T>, predicate: (value: T, index: number) => value is S, thisArg?: any): S | undefined;
export declare function findProto<T>(this: IterableX<T>, predicate: (value: T, index: number) => boolean, thisArg?: any): T | undefined;
declare module '../../iterable/iterablex' {
    interface IterableX<T> {
        find: typeof findProto;
    }
}