How to infer the ref type of a component?

Let's say you have a component that wraps an input:

const Input = React.forwardRef<HTMLInputElement, React.ComponentPropsWithoutRef<"input">>((props, ref) => {
    return <input ref={ref} type="text" />;
});

const Input = React.forwardRef<HTMLInputElement, React.ComponentPropsWithoutRef<"input">>((props, ref) => {
    return <input ref={ref} type="text" />;
});

And another component using Input, and forwarding the ref to it:

const LabelInput = React.forwardRef<HTMLInputElement, LabelInputProps>(({ text, ...props }, ref) => {
    return (
        <div>
            <label>{text}</label>
            <Input ref={ref} {...props} />
        </div>
    );
}
);

const LabelInput = React.forwardRef<HTMLInputElement, LabelInputProps>(({ text, ...props }, ref) => {
    return (
        <div>
            <label>{text}</label>
            <Input ref={ref} {...props} />
        </div>
    );
}
);

Here, we give HTMLInputElement as first type param of React.forwardRef. Is there a way to compute this value dynamically? In other words, is there a way to introspect the type of ref of Input? https://codesandbox.io/s/keen-swanson-rcxint?file=/src/App.tsx

brmzkw

CodeSandbox

keen-swanson-rcxint - CodeSandbox

keen-swanson-rcxint by brmzkw using react, react-dom, react-scripts

1 Reply

Julien CastetsOP•3y ago

I tried React.ComponentPropsWithRef<typeof Input>["ref"] but it doesn't work, I'm not sure it even makes sense. wooouhh, actually I can

const LabelInput = React.forwardRef(({ text, ...props }: LabelInputProps, ref: React.ComponentPropsWithRef<typeof Input>["ref"]) => {

const LabelInput = React.forwardRef(({ text, ...props }: LabelInputProps, ref: React.ComponentPropsWithRef<typeof Input>["ref"]) => {

it seems to work to put the type here.

Gaming

Programming

How to infer the ref type of a component?