1234567891011121314151617181920
import upperCase from "./upperCase.ts";import lowerCase from "./lowerCase.ts";
export default function (str: string, locale?: string): string {  if (str == null) {    return "";  }
  let result: string = "";
  for (let i: number = 0; i < str.length; i++) {    const c: string = str[i];    const u: string = upperCase(c, locale);
    result += u === c ? lowerCase(c, locale) : u;  }
  return result;}