Testing React components that use portals can be difficult until you understand what you really need to be testing.

Renders a table with rows dynamically created from an array of primitives.

Executes a callback immediately after a component is mounted.

Executes a callback immediately before a component is unmounted and destroyed.

Watches for changes made to the DOM tree, using a MutationObserver

Renders a password input field with a reveal button.

Renders an uncontrolled <textarea> element that uses a callback function to pass its value to the parent component.

Implements setTimeout() in a declarative manner.

Creates a stateful value with a default fallback if it's null or undefined, and a function to update it.

Implements setInterval() in a declarative manner.

Provides a boolean state variable that can be toggled between its two states.

Learn the differences between PropTypes.objectOf() and PropTypes.shape() and where to use each one with this quick guide.

Resolves to useEffect() on the server and useLayoutEffect() on the client.

Stores the previous state or props.

Renders a link formatted to send an email (mailto: link).