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import upperCase from "./upperCase.ts";import lowerCase from "./lowerCase.ts";
/** * Convert a `string` to swap case. * * Example: * * ```ts * swapCase("test string"); * //=> "TEST STRING" * * swapCase("Test String"); * //=> "tEST sTRING" * ``` */export default function (str: string, locale?: string): string {  if (str == null) {    return "";  }
  let result = "";
  for (let i = 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;}