Bug Report

Hi, we're trying to tighten up some of our code by using noUncheckedIndexedAccess. I know there are caveats to this compiler option which we've found by searching, but this one feels more like a bug?

🔎 Search Terms

Searched a variety of issues, the most relevant being: #13778

🕗 Version & Regression Information

4.5.4

⏯ Playground Link

💻 Code

    enum Meat {
      Sausage,
      Bacon
    }
    const sausage = Meat.Sausage
    const value = Meat[sausage] // string | undefined

🙁 Actual behavior

value in the above example can't be undefined

🙂 Expected behavior

value to be typed as string, not string | undefined