거짓 긍정 "연결할 수 없는 코드가 감지되었습니다.ts(7027)"? (False positive "Unreachable code detected.ts(7027)"?)

문제 설명

거짓 긍정 "연결할 수 없는 코드가 감지되었습니다.ts(7027)"? (False positive "Unreachable code detected.ts(7027)"?)

다음 스니펫은 console.log()에서 Unreachable code detected.ts(7027)를 반환합니다. Visual Studio Code v1.43.2에서 실행 중입니다.

const foo = (() => {
  try {
    // operation like "return fs.readFileSync("./credentials.json")" is more likely to fail (nodejs)
    // following line is just placeholder
    return { val: 4 };
  } catch (err) {
    return { val: ‑1 };
  }
})();

console.log(foo.val); //vs throws unreachable

TypeScript Playground example

Is it really a false positive?

참조 솔루션

방법 1:

If you really wanted to implement it this way, you'd need to have some sort of fallback for val if the catch occurs.

Implement it this way:

const foo = (() => {
  let val = undefined
  try {
    val = 4
  } catch (err) {
    throw new Error(err);
  }
  return { val }
})();

console.log(foo.val);

It may be just an issue with TypeScript, but this will fix the problem. that TS is moaning about.

(by IGLAK、Barry Michael Doyle)

참조 문서

1. False positive "Unreachable code detected.ts(7027)"? (CC BY‑SA 2.5/3.0/4.0)