React: TypeError: checker is not a function at validate

[binarykitchen]

somehow a weird warning is printed to the console when i have this property

  propTypes:
    links:       React.PropTypes.oneOfType(
      React.PropTypes.object
      React.PropTypes.arrayOf(React.PropTypes.object)
    )

the checkPropTypes() produces

error = TypeError: checker is not a function at validate

at

error = propTypes[propName](props, propName, componentName, location);

and this will print this warning in the console

Warning: Failed propType: checker is not a function Check the render method of `xxx`.

looks like a bug to me ... using React v0.13.3 here

[zpao]

Can you paste _exactly_ what code you have or make a jsfiddle/jsbin? There are a number of red flags in your code sample (oneOfType takes an array, you're missing commas)

[binarykitchen]

It is valid CoffeeScript syntax

[samwgoldman]

It's valid coffeescript syntax, but it isn't the correct way to invoke oneOfType, as @zpao noted. oneOfType takes an array as it's only argument.

foo(
  bar
  baz
)

desugars to foo(bar, baz), but you want foo([bar, baz]), so you need to write something like

foo [
  bar
  baz
]

instead.

[binarykitchen]

oh right, my bad ... forgot the array syntax.

hmmm, any chance you could add a type check here and throw an error when oneOfType doesn't have an array?

[rohanBagchi]

I am facing a similar issue.

Component.propTypes = {
    filter: PropTypes.shape({
        options: {
            openings: PropTypes.arrayOf(
                PropTypes.shape({
                    id: PropTypes.number,
                    name: PropTypes.string
                })
            )
        },
        selected: {
            opening_ids: PropTypes.arrayOf(PropTypes.number),
            candidate_added_date_range: PropTypes.string
        }

    }),
    syncOpeningsFilter: PropTypes.func,
    fetchOpeningsFilterOptions: PropTypes.func.isRequired,
    syncCandidateDateRangeFilter: PropTypes.func
};

Any clue what I might be missing? Thanks in advance :)

EDIT:
http://stackoverflow.com/a/37709854/1939344 helped

[gaearon]

Closing as not a common issue, and caused by wrong usage. If it comes up often, feel free to send a PR that adds better warnings.

[aljones15]

just for future reference you can also get this error if a PropType is left incomplete ie.

country: PropTypes