How to infer a type from a component prop?

Question

I'd like FormValueType type to be inferred from initialValue prop. Seems to be easy and possible, but I can't figure out how to do that. If you can just turn me towards the right direction it can be also very helpful. I wonder if there's a concept (or some) I miss.

export type AnyObject = {
  // eslint-disable-next-line
  [k: string]: any; 
};


interface FormProps<FormValueType> {
  children?: ReactNode;
  initialValue: FormValueType;
  onChange: (_v: FormValueType) => void;
}
export const BasicForm = ({ children, initialValue }: FormProps<AnyObject>) => {
  const [formState, setFormState] = useState(initialValue);
  return <FormContext.Provider value={{ formState, setFormState }}>{children}</FormContext.Provider>;
};

Answer 1

It looks like you just need to tack on another generic parameter:

export const BasicForm = <T extends AnyObject>({ children, initialValue }: FormProps<T>) => {

Playground

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Addressing your comment; just add a comma:

export const BasicForm = <T,>(...) => ...;