Type inference for selectProps.value

[davidmason]

I have to cast props.selectProps.value to a single value or array to use it in a custom component, even though the second type argument IsMulti is specified. It should be possible to have the type inferred for value.

value has type PropsValue<Option>, defined here:

react-select/packages/react-select/src/types.ts

Line 18 in 17ab36e

export type PropsValue<Option> = MultiValue<Option> | SingleValue<Option>;

It could take a second type argument IsMulti and narrow to a single or multi value when possible based on that. It could still be the union of both types if IsMulti is not locked down to true or false.

Aside: a similar thing is done in the OnChangeValue definition right after, but its needs to lock in one or the other so defaults to single without a definite false.

It would just need IsMulti passed through as a second type parameter where Props are defined for Select, here:

react-select/packages/react-select/src/Select.tsx

Line 274 in 17ab36e

value: PropsValue<Option>;

I don't know if this would break how PropsValue is used elsewhere, but superficially it looks like a positive change. Happy to hear what I've missed.