wrong condition check after await

[fy0]

Bug Report

🔎 Search Terms

typescript enum no overleap.

typescript enum async no overleap.

typescript enum no overleap with async.

typescript enum no overleap promise

🕗 Version & Regression Information

• This is a crash
• This changed between versions 4.1.3 and nightly(2020/01/12)_
• This is the behavior in every version I tried, and I reviewed the FAQ for entries about enum_
• I was unable to test this on prior versions because exists on nightly version

⏯ Playground Link

Playground link with relevant code

💻 Code

enum AEnum {
  A = 1,
  B = 2
}

export class A {
  a = AEnum.A;

  async func() {
    this.a = AEnum.A;
    const f = async () => {
      this.a = AEnum.B;
    }
    await f();
    if (this.a === AEnum.B) {  // Error: This condition will always return 'false' since the types 'AEnum.A' and 'AEnum.B' have no overlap.(2367)
      console.log(333);
    }
  }
}

🙁 Actual behavior

Error

🙂 Expected behavior

Success

[MartinJohns]

Another duplicate of #9998.

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.