export interface ReplaceAllOptions {
    fromIndex?: number;
    caseInsensitive?: boolean;
}
export type ReplacementFn = (match: string, offset: number, str: string) => string;
/**
 * 字符串替换函数
 *
 * @example
 * ```js
 * replaceAll('这是一个字符串', 'dog', 'monkey');  // '这是一个字符串'
 * replaceAll('这是一个字符串', '一', (match, offset) => {});  // '这是undefined个字符串'
 * ```
 *
 * @param str          字符串
 * @param substr       子字符串
 * @param replacement  替换内容或函数
 * @param options      选项
 * @returns            新字符串
 */
export default function replaceAll(str: string, substr: string, replacement: ReplacementFn | any, options?: ReplaceAllOptions): string;