I am having the same exact issue as what is detailed here:
https://github.com/Microsoft/TypeScript/issues/13948
Is there a resolution to this? I was thinking that maybe it is a typescript version error, but I am still having the same problem with version 2.0.
You can use alternate option, like you can create new obj variable like this:
handleUpdate (e:React.SyntheticEvent<HTMLInputElement>) {
const key = e.currentTarget.name as keyof Person;
const value = e.currentTarget.value;
//New Code
let obj ={}
obj[key] = value
this.setState(obj, ()=>{ alert(JSON.stringify(this.state)) })
}
Its working find check this CodeSandbox Snippet
