I'm not sure if this is something allowed by other frameworks, but it's a pretty good feature.
Custom PropType Validation
React offers functionality to add a custom prop validator, which again is a good feature, for example you might want to do hex code validation. Again, not sure if this is something unique to React, but it's a nice feature.
Shape
React will allow you to specify the shape of an object prop, this is an example:
I'm not sure if this is something allowed by other frameworks, but it's a pretty good feature.
Custom PropType Validation
React offers functionality to add a custom prop validator, which again is a good feature, for example you might want to do hex code validation. Again, not sure if this is something unique to React, but it's a nice feature.