React: checker is not a function

Question

I\'m getting this weird warning message in the console for my React app.

Warning: Failed propType: checker is not a function Check the render method of <

Answer 1

My version of Warning: Failed propType: checker is not a function came from forgetting to use PropTypes.shape for an object.

Changing:

someProps: {
    prop: React.PropTypes.string,
    anotherProp: React.PropTypes.number,
}

to this fixed the problem:

someProps: React.PropTypes.shape({
    prop: React.PropTypes.string,
    anotherProp: React.PropTypes.number,
})