Typescript有没有办法在switch中为大小写转换类型？

function convertCase(str: string, toLowerCase: boolean): string {
  switch (toLowerCase) {
    case true:
      return str.toLowerCase();
    case false:
      return str.toUpperCase();
    default:
      return str;
  }
}

const inputString = "Hello World";
const convertToLower = true;

const convertedString = convertCase(inputString, convertToLower);
console.log(convertedString); // 输出 "hello world"