@mediamonks/react-hooks

Collection of commonly used React hooks.

Getting started

Installing

Add @mediamonks/react-hooks to your project:

npm i @mediamonks/react-hooks

Example

Use a hook inside a component:

import { useToggle } from '@mediamonks/react-hooks';

function DemoComponent() {
  const [state, toggle] = useToggle(false);

  return (
    <div>
      <div>{state} </div>
      <button onClick={() => toggle()}>Toggle</button>
    </div>
  );
}

Docs

https://mediamonks.github.io/react-hooks/

Development

The information below should help you develop new hooks in this library.

Run npm run test -- --watch to run all unit tests in watch mode.

Run npm run storybook to preview your stories and documentation.

Folder Structure

useHookName

• useHookName.ts – The Hook itself
• useHookName.stories.tsx – To showcase the hook with a working UI, also used for dom testing
• useHookName.stories.mdx – Documentation about the hook
• useHookName.test.tsx – Unit tests for the hook

Steps for adding a new Hook:

Run the plop script and enter your hook name starting with use.

npm run plop

Which will execute the following steps, where you need to fill in the content.

• Create a new folder and a new ts file with the hook
  • Use the use prefix for the name of the hook
  • Use named exports to export the hook
  • Enter JSDoc for description and parameters
• Re-export the hook in the index.ts
• Add a markdown file documenting the hook
  • General description
  • Reference for types, parameters, return type
  • Simple and extended use cases
• Add a story file to test out the hook
  • Add an instructions banner at the top of the story
  • Create a type for the StoryArgs that match the template, so it can be used when rendering the Story inside tests.
• Add unit tests for the hook

Writing Unit test

Hooks can be tested using the renderHook function that now exists in @testing-library/react.

At the time of writing, this method is undocumented. It can be used as follows:

import { renderHook } from '@testing-library/react';

// init the hook
const { result, rerender, unmount } = renderHook(useToggle, {
  // values passed to your hook
  initialProps: { foo: 'bar' },
});

// inspect the response of the hook
console.log(result.current);

Run Component Lifecycle

To interact with your hook, you must use the act function.

import { act, renderHook } from '@testing-library/react';

// init the hook
const { result, rerender, unmount } = renderHook(useToggle, {
  // values passed to your hook
  initialProps: { foo: 'bar' },
});

// inspect the response of the hook
console.log(result.current);

act(() => {
  // interact with your hook
  result.current[1]();
});

// inspect the updated value of the hook
console.log(result.current);