reactjs - PropTypes check of object with dynamic keys

Question

React has lots of ways of using PropTypes to check the value of a prop. One that I commonly use is React.PropTypes.shape({...}). However, I recently came across a situation where I have an object that will have dynamic key/values inside. I know that each key should be a string (in a known format), and each value should be an int. Even using a custom prop validation function, it still assumes you know the key of the prop. How do I use PropTypes to check that both the keys and values of an object/shape are correct?

...
someArray: React.PropTypes.arrayOf(React.PropTypes.shape({
  // How to specify a dynamic string key? Keys are a date/datetime string
  <dynamicStringKey>: React.PropTypes.number
}))
...

So again: I want to at the very least check that the value of each key is a number. Ideally, I would also like to be able to check the the key itself is a string in the correct format.

Answer 1

To validate only the values, you can use React.PropTypes.objectOf.

...
someArray: React.PropTypes.arrayOf(
  React.PropTypes.objectOf(React.PropTypes.number)
)
...