ExpressJS 5 - Promise returned in function argument where a void return was expected.

I am trying to use async and await in Typescript with ExpressJS 5 beta 1 and getting the following error:

Promise returned in function argument where a void return was expected.eslint[@typescript-eslint/no-misused-promises](https://typescript-eslint.io/rules/no-misused-promises)

I had anticipated this would no longer be the case in ExpressJS 5, as noted by the ESLint maintainers: https://github.com/standard/eslint-config-standard-with-typescript/issues/613

Have I missed something, or is this still not handled in Express 5?

function testFunction() {
  return new Promise((resolve) => {
    setTimeout(() => {
      resolve('test')
    }, 1000)
  })
}

router.get('/v1/sdk/device', async (_req, res) => {
  const test = await testFunction()
  console.log(test)
  res.send()
})

[maggie0002]

I stumbled across this on my travels: https://github.com/DefinitelyTyped/DefinitelyTyped/issues/50871

I think that is significant enough to suggest it is typings related. The typings have changed a lot since that was pushed, so hasn’t been easy to test. Not really sure what to do with it either, I imagine it is pending a community contribution of a v5 typings. I will update that post, and see what happens. In the meantime, will just have to work around the error and take confidence in knowing that it is in theory still working as expected now in v5.

[maggie0002]

Much appreciated. Let me see if I can put together an example. Not 100% sure I can because it may be somewhat related to visual studio code and that’s harder to replicate across systems. But worth a shot.