wtf onChange

[fuafa]

type EventHandler<T> = { bivarianceHack(data: T): void }['bivarianceHack']


interface FormProp<T> {
    onChange: EventHandler<T>
    onChange2: <R extends string>(data: R) => void
    onChange3<S extends string>(data: S): void
    onChange4(data: string): void
    onChange5: (data: string) => void
}

declare const Form: React.ComponentType<FormProp<string>>
declare const onChange: (data: '') => void

<Form
    onChange={onChange} // pass
    onChange2={onChange} // fail
    onChange3={onChange} // fail
    onChange4={onChange} // pass
    onChange5={onChange} //fail
/>