Refactoring from PropTypes, an exercise.md

repository	branch	sandbox
https://github.com/stevekinney/name-badges	basic-implementation	https://codesandbox.io/s/h1nrp5

Alright, let's get the blood flowing a bit and take a look at this component hiding out in src/components/controls.jsx:

import PropTypes from 'prop-types';

const ControlPanel = ({ name, onChange }) => {
  return (
    <form
      className="flex flex-row gap-4 text-white bg-primary-10"
      onSubmit={(event) => event.preventDefault()}
    >
      <div>
        <label className="font-bold">Your Name</label>
        <input
          name="name"
          className="w-full"
          type="text"
          value={name}
          onChange={onChange}
        />
      </div>
    </form>
  );
};

ControlPanel.propTypes = {
  name: PropTypes.string,
  onChange: PropTypes.func,
};

export default ControlPanel;

Exercise

We're going to quickly migrate this component from TypeScript to JavaScript.

This is mostly a set up to make a simple point: Having a mix of JavaScript and TypeScript as you're migrating is totally a thing.

Here's what you're going to do:

• Change the file extension form .jsx to .tsx.
• Get rid of those gnarly propTypes and add types to our props. You can either do it inline or you can create a new type called ControlPanelProps.
• See if you can add another prop to NameBadge called greeting. This prop should replace "HELLO" on the badge.
• See if you can figure out how to type the onChange handler.
  • Hint: Use what you have learned about hovering over properties to figure out what types they use.
  • If you can't figure it out, you can cheat and the any type. But, be warned: this is the only time that I'm going to allow you to use the any for the remainder of our time together.

If you don't want to clone the respository, then you can also use this sandbox.

If you're curious, you can check out the solution here.