TS7027

#What it means

The binder found statements that can't be reached because the code before them always exits. It is reported when allowUnreachableCode is false; with the option unset, editors show the code faded instead of reporting an error.

#Example

{
  "compilerOptions": {
    "strict": true,
    "target": "es2022",
    "module": "esnext",
    "moduleResolution": "bundler",
    "noEmit": true,
    "allowUnreachableCode": false
  }
}

export function f(): number {
  return 1;
  console.log("done");
}

index.ts(3,3): error TS7027: Unreachable code detected.

Recorded by node scripts/verify-examples.mjs with ts-r built from commit 6deaf01.

#How to fix

• Delete the unreachable statements, or move them before the return.
• If the early exit is a mistake (for example a stray return), fix that instead.