/**
 * If `value` is not an array, return `defaultArray`.
 * Else if `defaultString` is undefined, return `value`.
 * Else return a copy of `value` with a castString on all its elements.
 *
 * @param   value         [description]
 * @param   defaultArray  [description]
 * @param   defaultString [description]
 * @returns               [description]
 */
export default function castStringArray(value: any, defaultArray?: string[], defaultString?: string): any[];