/**
 * Replaces whatever substring is at the given index in the original string with the new string.
 * Optionally, provide a length of the substring to get replaced.
 *
 * @category String
 * @category Package : @augment-vir/common
 * @example
 *
 * ```ts
 * import {replaceStringAtIndex} from '@augment-vir/common';
 *
 * replaceStringAtIndex('eat the waffles', 4, 'his'); // outputs `'eat his waffles'`
 * replaceStringAtIndex('eat the waffles', 4, 'my', 3); // outputs `'eat my waffles'`
 * ```
 *
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export declare function replaceStringAtIndex(originalString: string, start: number, newString: string, length?: number): string;