/**
 * Inserts values in a string
 * This is mostly used to insert values in a translation message
 * @param {string} str The string that contains the variables
 * @param {object} params The params to insert in the string message
 * @param {string} symbol The symbol to look for to insert the params in the string message. Default is `@` symbol. You can also pass an array of an openning and closing like this `["{{", "}}"]`
 * @returns The replaced string
 */
export declare function stringInsert(str: string, params: any, symbol?: string | [string, string]): string;