import { BidirectionalIndex } from "../../arrays";
import { PipeBody } from "../../pipables";
import type { LinqWrapper } from "../linqWrapper";
import { IndexedSequenceElementPredicate } from "./typing";
export declare function first<T>(predicate?: IndexedSequenceElementPredicate<T>): PipeBody<LinqWrapper<T>, T>;
export declare function last<T>(predicate?: IndexedSequenceElementPredicate<T>): PipeBody<LinqWrapper<T>, T>;
export declare function firstOrDefault<T>(predicate?: IndexedSequenceElementPredicate<T>, defaultValue?: T): PipeBody<LinqWrapper<T>, T | undefined>;
export declare function lastOrDefault<T>(predicate?: IndexedSequenceElementPredicate<T>, defaultValue?: T): PipeBody<LinqWrapper<T>, T | undefined>;
export declare function elementAt<T>(index: BidirectionalIndex): PipeBody<LinqWrapper<T>, T | undefined>;
export declare function elementAtOrDefault<T>(index: BidirectionalIndex, defaultValue?: T): PipeBody<LinqWrapper<T>, T | undefined>;
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