feat: add enum value to union and some utils

[4xii]

🎁 Pull Request

• [✅] Used a clear / meaningful title for this pull request
• [✅] Tested the changes in your own code (on your projects)
• [✅] Added / Edited tests to reflect changes (tests folder)
• [✅] Have read the Contributing part of the Readme
• [✅] Passed npm test

Why have you made changes?

Sometimes we need to change the enumerated value into a union type.
stackoverflow:
https://stackoverflow.com/questions/52393730/typescript-string-literal-union-type-from-enum

enum StrValueEnum {
  T1 = "1",
  T2 = "2",
  T3 = "3",
}


enum NumValueEnum {
  T1 = 1,
  T2 = 2,
  T3 = 3,
}

`${StrValueEnum}` // Type is "1" | "2" | "3",that is right
`${NumValueEnum}` // Type is "1" | "2" | "3",that is wrong

but sorry about I don't know how to fix lint，Command not found. If this idea is OK，plz tell me how to fix.