错误 TS2571：对象在打字稿中属于“未知”类型

Question

hello i need help to resolve this error

try{

} catch {
  let errMsg;
  if (error.code === 11000) {
    errMsg = Object.keys(error.keyValue)[0] + "Already exists";
  }
  return res.status(500).json({ msg: errMsg });
}

console.log(error);
  

=>error TS2571: Object is of type 'unknown'

Answer 1

You can set useUnknownInCatchVariables as false in tsconfig.json .

try {

} catch(err) { // the type of catch variable is any

}

But use any is not a safe way, handle all possible boundary conditions manually is much better.

catch(err: unknown) {
  if (err instanceof Error) { // narrow `err` from `unknown` to `Error`
    console.log(err.message);
  }
}