如何从字符串中获取类型安全枚举值？

enum Color {
  Red = "red",
  Green = "green",
  Blue = "blue"
}

function getEnumValue(str: string): Color | undefined {
  switch (str) {
    case "red":
      return Color.Red;
    case "green":
      return Color.Green;
    case "blue":
      return Color.Blue;
    default:
      return undefined;
  }
}

const color: Color | undefined = getEnumValue("red");
if (color !== undefined) {
  console.log(color); // 输出：Color.Red
} else {
  console.log("Invalid color"); // 输出：Invalid color
}