Why does prettier want to prefix my IIAFE with ";"?

I have had async funcs in my useEffect hooks from a javascript project that I am now converting to typescript:

(async ():Promise<void> => {
  const stuff = await doStuff()
  setThings(stuff)
})()

Worked without issues before but now in typescript I am getting an error:

...
    "severity": 8,
    "message": "Replace `(async·():` with `;(async·():·`",
    "source": "eslint",
...