为什么try catch not catch等待function错误

Question

I know that if we have a try catch setup like this:

try{
   runSyncFunction()
}
catch(err){
  cosole.log(err)
}

If there is an error in the runSyncFunction the catch error will fire.

As per my understanding if we have try catch setup like this:

try{
   runAsyncFunction()
}
catch(err){
  cosole.log(err)
}

If there is an error in the runAsyncFunction the catch error will not fire because the function runs at a later time.

What I do not understand is why the catch error will not fire when we use await:

try{
   await runAsyncFunction()
}
catch(err){
  cosole.log(err)
}

If there is an error in the async function this time, and since the javascript engine is waiting for it to finish running why would it not be able to catch the error in case of an error.

Edit1:

router.post("/postDetails", async(req, res) => {
  try{
     let partID = await database.getPartID(partNumber[i])
     if (!partID) {
            throw createError(404, `"${partNumber[i]}" PartNumber not 
      found. Please re-enter the partnumber`)
    }
    //Other stuff  
  }
  catch(err){
    console.log(err) 
  }
})

Second function:

database.getPartID = async function getPartID(partNumber){
    try{
        let partID = await pool.query(`Select partID from parts where partNumber = '${partNumber}'`)
        return partID[0].partID
    }
    catch(err){
        console.log(err)
        return false
    }
}

I am returning false because the first async function does not throw an error message if there is an error in the second async function when there is a try catch block

Answer 1

These are some tips to use try...catch

We can use try...catch for synchronous code.

We can use try...catch (in combination with async functions) and the .catch() approaches to handle errors for asynchronous code.

When returning a promise within a try block, make sure to await it if you want the try...catch block to catch the error.

Answer 2

Your second functions catch block is resolving the rejected promise. Therefore your first function is not catching the error. use return Promise.reject(err) in your second functions catch block, so that your first function can catch the error.