Why PropType.boolean is function

[tdimdimich]

Modal.propTypes = {visible: PropTypes.boolean}

Warning: Failed prop type: Modal: prop type visible is invalid; it must be a function, usually from React.PropTypes.

I think that the boolean type should be called 'boolean'
You can add boolean as alias for bool, for expected behavior PropTypes

I think if undefined PropType shouldn't be function

[gouegd]

PropTypes.boolean is undefined. You get a warning because React expects a function.
PropTypes.bool, like PropTypes.string and others, is a function that validates your props (so it can't be a boolean, a string, etc).

(That said, having an alias for bool as boolean would probably be a good thing)

[gaearon]

Yes, it’s expected (you needed PropTypes.bool as documented in the README). Perhaps the warning could say Have you misspelled a PropType? at the end if the validator is undefined. Would either of you be interested in sending a PR to make the warning better?

[gouegd]

I can probably have a go at this next week if nobody does before.

[jonleung]

👍