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    5.8.9 • Public • Published



    This is FairFX's design system. It includes React components, design tokens and other styles used for creating apps and websites

    npm FairFX Willow Storybook Changelog

    Install @fairfx/fuji


    To add this package to your react application, run

    yarn add @fairfx/fuji
    # or use npm instead 
    npm install --save @fairfx/fuji


    A proper documentation solution is still being researched. In the meantime, each component/file should have their own readme, so navigate to the component directory for more info.

    React components

    The React components included with Fuji are all styled with styled-components. See a full list of all the components and their imports below.


    Import components that you want from the library and use them like so:

    import { Button, ButtonSecondary } from '@fairfx/fuji';
    const Actions = () => (
        <Button onClick={this.save}>Save changes</Button>
        <ButtonSecondary onClick={this.clear}>Clear</ButtonSecondary>

    List of imports & components

    Design Tokens


    Import usage

    import {
      FujiTypes, // Various Typescript types
      tokens, // design tokens
      globalStyles, // globalStyles
      // Fonts
      // fonts hosted on cdn.fairfx.com
      // with the @font-face declarations
      Effra, // all fonts
      EffraLight, // only Effra Light
      EffraRegular, // only Effra Regular
      EffraMedium, // only Effra Medium
      EffraBold, // only Effra Bold
      EffraHeavy, // only Effra Heavy
      // Components
    } from '@fairfx/fuji';

    Demo playground

    Try the demo on CodeSandbox.

    Component development

    • styled-components is used for component styling.
    • design-system-utils is used in conjunction with the design tokens (see below).
    • styled-is is a small utility used to improve styling when passing flag/boolean props to a component

    See a list of all dependencies here

    Design Tokens

    Design tokens are the visual design atoms of the design system — specifically, they are named entities that store visual design attributes. We use them in place of hard-coded values (such as hex values for color or pixel values for spacing) in order to maintain a scalable and consistent visual system for UI development. Think of them like your Sass variables.

    Our design tokens rely on design-system-utils, a micro framework that makes it easy to get values from your tokens file.

    Modifying/Updating tokens

    The main tokens file can be found here. It uses the base structure that design-system-utils requires, but beyond that, there are no other restrictions.

    Example usage

    import { tokens } from '@fairfx/fuji';
    const Box = styled.div`
      font-size: ${tokens.fs('l')};
      background-color: ${tokens.color('primary')};
      border-radius: ${tokens.get('borderRadius')};


    First you should install dependencies:

    yarn install

    Components can be developed and visually tested using Storybook. Each component should have a *.story.js file in the same directory.

    Run Storybook development environment

    Storybook creates an area to preview each component in isolation.

    yarn storybook

    Then open https://localhost:9001

    Anatomy of a component directory

    E.g. A Button "atom" found in the /src/components/atoms directory.

    ├── Button.tsx // < component code
    ├── README.md // < component documentation
    ├── Button.story.tsx // < component story
    ├── Button.test.tsx // < component tests
    ├── __snapshots__
    │   └── Button.test.tsx.snap // < auto-generated snapshot code
    └── index.ts // < component entry file

    Build scripts

    • yarn storybook: Run Storybook development environment
    • yarn build: Compile a production build with Rollup
    • yarn watch: Compile/watch with Rollup. This is useful in conjuction with yarn link.
    • yarn format: Format all JS with Prettier
    • yarn lint: Lint JS and CSS-in-JS
    • yarn lint:js: Lint JS with TSLint
    • yarn lint:css: Lint CSS-in-JS with Stylelint
    • yarn size: Test the file size of the build
    • yarn size:why: Analyse the the build
    • yarn test: Run all tests (test:js & test:visualregression)
    • yarn test:js: Run all JS tests with Jest
    • yarn test:visualregression: Run visual regression tests with ChromaticQA
    • yarn test:coverage: Run a code coverage test with Jest
    • yarn test:watch: Run test suite while watching for changes


    Tests are run using Jest. We use react-testing-library with Jest to encourage good test practices.

    Run tests

    yarn test

    or run tests and rerun tests after files have been modified:

    yarn test:watch

    Writing tests

    Create a *.test.js in the same directory as your component.

    We use two types of tests to test our components
    • Unit tests test functional units of your code
    • Snapshot tests are a very useful tool whenever you want to make sure your UI does not change unexpectedly. We capture a specific a rendered version of the component with specific markup, if the component is modified, the snapshot test will fail. In order for the test to pass, the snapshot has to be updated, this can normally be done by pressing the u key after the test has run. Find out more here
    Unit test example
    import React from 'react';
    import { render, fireEvent, cleanup } from 'react-testing-library';
    import 'jest-dom/extend-expect';
    import { Button } from './index';
    // automatically unmount and cleanup DOM after the test is finished.
    test('Render a button', () => {
      // Arrange
      const { getByText } = render(<Button>This is a button</Button>);
      // Act
      fireEvent.click(getByText('This is a button'));
      // Assert
      expect(getByText('This is a button')).toHaveTextContent('This is a button');
    Snapshot test example
    import React from 'react';
    import 'jest-dom/extend-expect';
    import 'jest-styled-components';
    import { Button } from './index';
    // automatically unmount and cleanup DOM after the test is finished.
    test('Button snapshot', () => {
      const tree = render(<Button>This is a button</Button>); // render a button
      expect(tree).toMatchSnapshot(); // check if the rendered button matches the snapshot


    JavaScript linting

    TSLint is used to lint our Typescript code.

    CSS linting

    Stylelint is used to lint all styled-components styles. There are some specific changes/additions needed when working with styled-components, these are specifically related to interpolation; please read the docs here: styled-components.com/docs/tooling#interpolation-tagging. Below is an example of what is needed for Stylelint to understand this syntax:

    From this:

    import { Button } from '@fairfx/fuji';
    const Wrapper = styled.div`
      ${Button} {
        color: red;

    To this:

    import { Button } from '@fairfx/fuji';
    const Wrapper = styled.div`
      ${/* sc-selector */ Button} {
        color: red;

    Please read the docs so you understand this fully.

    Publishing and Deploying

    The project follows Semantic Versioning. Each new release to npm needs a version bump, read on for package release instructions.

    Package release process


    Continuous Integration

    • CircleCI is used to automate our tests and compile our code for each release
    • ChromaticQA tests for visual regressions on each PR




    npm i @fairfx/fuji

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