React - Use PropTypes to Define the Props You Expect

Tell us what’s happening:
Why doesn’t it throw an error when i provide a string instead of a number?

Your code so far

const Items = (props) => {
  return <h1>Current Quantity of: {props.quantity}</h1>

// Change code below this line
Items.propTypes = {quantity: PropTypes.number.isRequired}
// Change code above this line
Items.defaultProps = {
  quantity: 0

class ShoppingCart extends React.Component {
  constructor(props) {
  render() {
    return <Items quantity = {"h"} />

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36

Challenge: React - Use PropTypes to Define the Props You Expect

Link to the challenge:

Most likely because of how the React challenges are run and tested. You should normally get a warning.

Warning: Failed prop type: Invalid prop quantity of type string supplied to Items, expected number.

Here is the code on StackBlitz. If you open the browser console you can see the warning.

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