score:10

Accepted answer

Based on the error it seems like you're using the wrong FocusEvent type - you are handling a React synthetic event, so you need to use the React type.

I'm getting no errors with the following handler (your results may vary depending on your version of react.d.ts):

import {FocusEvent} from 'react'
...
private onFocus(ev: FocusEvent<any>){
    console.log(ev);
}

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