New Rule: `onChange` or `readOnly` prop when `checked` is set on an `input` element

[karlhorky]

Hi there! 👋

The following code produces a warning from React (see below):

<input
  type="checkbox"
  checked={marketingConsent}
  onClick={(event) => {
    setMarketingConsent(event.currentTarget.checked);
  }}
/>

This is the warning:

Warning: You provided a `checked` prop to a form field without an `onChange` handler. This will render a read-only field. If the field should be mutable use `defaultChecked`. Otherwise, set either `onChange` or `readOnly`.

Since React shows a warning for it, maybe there can be a lint rule for it too? To guide developers towards either:

• usage of onChange or readOnly props with checked prop on an input
• usage of defaultChecked for uncontrolled components

[ljharb]

Sure, that seems reasonable.