https://www.frontend.moe/posts/ts-react-form-event/

no-typing.ts

import React, { FormEvent } from 'react'
const App: React.FC = () => {
  const [flag, setFlag] = useState<boolean>()
  const onSubmit = async (event: FormEvent) => {
    event.preventDefault()
    // @ts-ignore
    const { value } = event.target.mailid // mailid is 'any' type
    setFlag(await submitID(value))
  }
  return (
   // ...
  )
}