/**
 * Insert, remove or replace characters from a string, similar to the native `Array.splice()` method,
 * except that the start index and delete count refer to grapheme clusters within the string.
 *
 * @remarks
 * String may contain ANSI escape codes; inserted content will adopt any ANSI styling applied to the character
 * immediately preceding the insert point. ANSI control sequences that are not style or hyperlink sequences
 * will be preserved in the output string.
 *
 * @example
 * ```ts
 * import { spliceChars } from 'tty-strings';
 *
 * spliceChars('à̰ b̸ ĉ̥', 2, 1, 'x͎͛ÿz̯̆'); // 'à̰ x͎͛ÿz̯̆ ĉ̥'
 * ```
 *
 * @param string - Input string from which to remove, insert, or replace characters.
 * @param start - Character index at which to begin splicing.
 * @param deleteCount - Number of characters to remove from the string.
 * @param insert - Optional string to be inserted at the index specified by the `start` parameter.
 * @returns The modified input string.
 */
export default function spliceChars(string: string, start: number, deleteCount: number, insert?: string): string;
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