/**
 * Normalize an insertion index for an array of a given length.
 *
 * Positive indexes are clamped to the range `[0, length]`, so values
 * larger than `length` insert at the end. Negative indexes are treated
 * as offsets from the end (like `Array.prototype.at`), and are clamped
 * to `0` if they go past the start.
 *
 * @param index - Requested insertion index (may be negative to count from the end).
 * @param length - Current length of the array being indexed into.
 * @returns A safe insertion index in the range `[0, length]`.
 */
export declare function normalize_ix(index: number, length: number): number;
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