prop-types

<!-- development version --> <script src="https://cdnjs.cloudflare.com/ajax/libs/prop-types/15.6.0/prop-types.js"></script> <!-- production version --> <script src="https://cdnjs.cloudflare.com/ajax/libs/prop-types/15.6.0/prop-types.min.js"></script> To load a specific version of prop-types replace 15.6.0 with the version number. Usage PropTypes was originally exposed as part of the React core mod