/**
 * Returns the element at a specified index in a sequence or throws if the index is out of range.
 * A negative index can be used to get element starting from the end.
 * @example
 * ```typescript
 * const indexZero = elementAt([1, 2, 3], 0); // Will be 1
 * const willBeNull = elementAt([1, 2, 3], 10); // Will throw.
 * const last = elementAt([1, 2, 3], -1); // 3
 * ```
 * @typeparam TSource The type of the source iterable.
 * @param src The source iterable.
 * @param index The zero-based index of the element to retrieve.
 * @returns The element at the specified position in the source sequence.
 */
export declare function elementAt<TSource>(src: Iterable<TSource>, index: number): TSource;
/**
 * Returns the element at a specified index in a sequence or null if the index is out of range.
 * A negative index can be used to get element starting from the end.
 * @example
 * ```typescript
 * const indexZero = elementAtOrDefault([1, 2, 3], 0); // Will be 1
 * const willBeNull = elementAtOrDefault([1, 2, 3], 10); // Will be null.
 * const last = elementAtOrDefault([1, 2, 3], -1); // 3
 * ```
 * @typeparam TSource The type of the source iterable.
 * @param src The source iterable.
 * @param index The zero-based index of the element to retrieve.
 * @returns The element at the specified position in the source sequence.
 */
export declare function elementAtOrDefault<TSource>(src: Iterable<TSource>, index: number): TSource | null;
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