React Component Library

A collection of React components written for Royal Navy web applications.

Installation

The Royal Navy React Component Library is available as an NPM package.

To install it, run the relevant command for your package manager:

// npm
npm install @royalnavy/fonts @royalnavy/react-component-library styled-components

// pnpm
pnpm add @royalnavy/fonts @royalnavy/react-component-library styled-components

Note: styled-components is a required peer dependency and is installed with the above command.

Usage

import React from 'react'
import ReactDOM from 'react-dom'
import '@royalnavy/fonts'
import { GlobalStyleProvider, Button } from '@royalnavy/react-component-library'
import { lightTheme } from '@royalnavy/design-tokens'

function App() {
  return (
    <GlobalStyleProvider theme={lightTheme}>
      <Button variant="primary">Hello, World!</Button>
    </GlobalStyleProvider>
  )
}

ReactDOM.render(<App />, document.querySelector('#app'))

<GlobalStyleProvider />

This context provider component applies global Royal Navy Design System styles to your application (resets, normalize and fonts). You should wrap the root of your app in a single instance of this component. (Take care to avoid having multiple instances mounted at once, as this will lead to duplicated global styles.)

Theming

By default the GlobalStyleProvider will use the lightTheme exported by the @royalnavy/design-tokens package. You can create your own themes by injecting your own custom token set via the theme prop.

We recommend reading the following blog post on styled-theming. Using this pattern you can selectively theme individual components. Inverting responsibility for the implementation of the theme to the component itself.

When utilising this pattern remember to extend a base token set:

<GlobalStyleProvider theme={{ ...lightTheme, customThemeMode: 'foo' }} />

Hooks

useFloatingElement

This hook aids in the positioning of arbitrary elements relative to a target element. The positioning engine will intelligently position the element based on available screen real-estate.

import { useFloatingElement } from '@royalnavy/react-component-library'

const Example = () => {
  const {
    targetElementRef,
    floatingElementRef,
    arrowElementRef,
    styles,
    attributes,
  } = useFloatingElement(placement)

  return (
    <>
      <Target ref={targetElementRef} />
      <Float
        ref={floatingElementRef}
        style={styles.popper}
        {...attributes.popper}
      >
        Hello, World!
      </Float>
    </>
  )
}

The hook wraps a popular underlying positioning engine called Popper.

If you want opinionated styling for your floating element please consider the Popover component.

Questions

The Design System is maintained by a team at the Royal Navy. If you want to know more about the Royal Navy Design System, please email the Design System Team.

Documentation

The documentation website contains all the information you need to build your application using the Royal Navy Design System.

End-to-end tests

End-to-end tests run in both Chrome and Firefox using Playwright. Tests are dependent on the Storybook running with a test configuration:

pnpm run storybook:test

Playwright browsers and dependencies also have to be installed:

pnpm run test:e2e:install

Run all tests

pnpm run test:e2e

Run specific tests

pnpm run test:e2e <regex>

Run all tests with tracing

pnpm run test:e2e:trace

Open the HTML test report

pnpm run test:e2e:show-report

Contributing

The contributing guide resource presents information about our development process.

Changelog

If you have recently updated then read the release notes

Roadmap

The Design System Roadmap Board contains the work that has been prioritised for the next 12 months.