This is a series of posts about how to create a module of reusable ui components with typescript, storybook and styled components:

• React ui-kit with TS & styled-components: Bootstrap the project
• React ui-kit with TS & styled-components: Adding a theme

Have you ever found yourself creating the same UI components over and over again when starting new projects? Or is your project so big that you would love to have a separate package with your most basic and reusable UI components? Do you find yourself digging your project's source code to figure how if a given component supports a feature that you need for a given situation?

In this blog post I'll try to guide you on how to setup a UI kit that is self-documented through tsdocs, and has a catalog of components that shows exactly how the components behave and all the features they support.

The tools we're going to use are: React, Typescript, Storybook and Styled-components.

Kickoff and setup

Create a folder for your ui-kit, lets call it, bob-ross-kit. Do the npm init thing and add the following dependencies:

{
  ...
  "devDependencies": {
    "@storybook/addon-info": "^4.1.4",
    "@storybook/addon-knobs": "^4.1.4",
    "@storybook/addons": "^4.1.4",
    "@storybook/react": "^4.1.4",
    "@types/react": "^16.7.17",
    "@types/react-dom": "^16.0.11",
    "@types/styled-components": "^4.1.4",
    "babel-core": "^6.26.3",
    "babel-plugin-styled-components": "^1.10.0",
    "react-docgen-typescript-loader": "^3.0.0",
    "ts-loader": "^5.3.2",
    "typescript": "^3.2.2"
  },
  "dependencies": {
    "react": "^16.6.3",
    "react-dom": "^16.6.3",
    "styled-components": "^4.1.3"
  }
  ...
}

WOW, thats a lot of dependencies for a empty project! Do not worry, we're going to use them all! 😅

Storybook

Storybook is a UI development environment and playground for UI components. The tool enables users to create components independently and showcase components interactively in an isolated development environment.

We're going to add storybook and a few addons to add extra features to our stories. If you want a more detailed and beginner friendly intro to storybook, check out Storybook for React - Getting Started.

By default, Storybook comes with a way to list stories and visualize them. Addons implement extra features for Storybooks to make them more useful.

@storybook/addon-info:
show additional information about your stories, properly configured it can show docs of your props and the jsx of the usage of your component

@storybook/addon-knobs:
adds a section on the bottom where you can add props modifiers to see how a component reacts to different props;

In order to configure storybook, start by creating a .storybook folder with addons.js and config.js files.

• Create a addons.js file to import our addons that need a register step:

import '@storybook/addon-knobs/register';

• Create a config.js file. Here we configure our addons and tell storybook how to load your stories. Personally I prefer to have the stories as a file next to the component, prefixed with .stories.js.

import { addDecorator, configure, setAddon } from '@storybook/react';
import { withInfo } from '@storybook/addon-info';
import { withKnobs } from '@storybook/addon-knobs/react';

addDecorator(withInfo({ header: true, inline: true }));
addDecorator(withKnobs);

const req = require.context('../src', true, /.stories.jsx$/);

function loadStories() {
  req.keys().forEach(file => req(file));
}

configure(loadStories, module);

• Add a storybook script to your package.json.

{
  ...
  "scripts": {
    "storybook": "start-storybook -p 6006 -c .storybook"
  }
  ...
}

Typescript

TypeScript is an open-source programming language developed and maintained by Microsoft. It is a strict syntactical superset of JavaScript, and adds optional static typing to the language.

Besides the obvious of adding static typing to our code, using typescript is also great for IDE integration. For a reusable module is really great to have a awesome autocomplete, this will allow developers to use your components without having to jump to the documentation every time.

• Init the typescript setup with npx tsc --init this should create a default tsconfig file and make some changes to it:

{
  ...
  "outDir": "build/lib",
  "lib": ["es5", "es6", "es7", "es2017", "dom"],
  "sourceMap": true,
  "allowJs": false
  "jsx": "react",
  "moduleResolution": "node",
  "rootDir": "src",
  "baseUrl": "src",
  "experimentalDecorators": true,
  "declaration": true
  ...
}

• In order to use storybook with typescript we need to create a .storybook/webpack.config.js file:

const path = require('path');

module.exports = (baseConfig, env, config) => {
  config.module.rules.push({
    test: /\.tsx?$/,
    include: path.resolve(__dirname, '../src'),
    use: [
        require.resolve('ts-loader'), 
        require.resolve('react-docgen-typescript-loader')
    ]
  });

  config.resolve.extensions.push('.ts', '.tsx');

  return config;
};

You might notice the TSDocgenPlugin plugin. This will pick your tsdocs from your typings and together with @storybook/addon-info will endow your stories with info from your props.

The following Props interface:

export interface Props {
  /** Button content  */
  children: React.ReactNode;
  /** Callback to handle the click event  */
  onClick: () => void;
  /**
   * Disables onClick
   *
   * @default false
   **/
  disabled?: boolean;
}

Will be rendered as a table in our story, like this:

• Add a build and watch script to your package.json:

{
  ...
  "scripts": {
    ...
    "build": "tsc",
    "build:watch": "tsc --watch"
  },
  ...
}

This is not exactly required, you can call directly tsc, but personally I prefer to have all scripts with npm aliases.

Styled Components

Utilising tagged template literals (a recent addition to JavaScript) and the power of CSS, styled-components allows you to write actual CSS code to style your components. It also removes the mapping between components and styles – using components as a low-level styling construct could not be easier!

• Create a .babelrc file in the root of your project with:

{ "plugins": ["babel-plugin-styled-components"] }

Using the babel plugin is not mandatory, but as mentioned in their github page it offers a set of useful features:

• Consistently hashed component classNames between environments (a must for server-side rendering)
• Better debugging through automatic annotation of your styled components based on their context in the file system, etc.
• Various types of minification for styles and the tagged template literals styled-components uses

And thats it. The project is finally configured...

Create your first component

Lets create a simple button, in a file called src/styled-button/styled-button.tsx:

import * as React from 'react';
import styled from 'styled-components';

export interface Props {
  /** Button content  */
  children: React.ReactNode;
  /** Callback to handle the click event  */
  onClick: () => void;
  /**
   * Disables onClick
   *
   * @default false
   **/
  disabled?: boolean;
}

const noop = () => {};

const RootStyledButton = styled.button`
  padding: 0px 20px;
  height: 49px;
  border-radius: 2px;
  border: 2px solid #3d5567;
  display: inline-flex;
  background-color: ${() => (props.disabled ? 'red' : 'blue')};
`;

const ButtonSpan = styled.span`
  margin: auto;
  font-size: 16px;
  font-weight: bold;
  text-align: center;
  color: #fff;
  text-transform: uppercase;
`;

/*
 * If you opt to do export default, you'll still need to have this 
 * export for the TsDocGen work properly (I struggled to find this out)
 */
export const StyledButton: React.SFC<Props> = (props: Props): React.ReactNode => {
  const { children, onClick, disabled = false } = props;

  return (
    <RootStyledButton 
        disabled={disabled} 
        onClick={!disabled ? onClick : noop}
    >
      <ButtonSpan>{children}</ButtonSpan>
    </RootStyledButton>
  );
};

Create your first story

As mentioned in the storybook configuration, we conventioned to have our stories next to our components with the prefix .stories.jsx. So lets create a file called styled-button.stories.jsx next to our component with the following content:

import React from 'react';
import { text, boolean } from '@storybook/addon-knobs/react';
import { storiesOf } from '@storybook/react';

import { StyledButton } from './styled-button';

storiesOf('StyledButton', module)
  .add('basic', () => (
    <StyledButton disabled={boolean('disabled', false)}>
      {text('text', 'Hello World')}
    </StyledButton>
  ));

As you can see we use some helper functions from @storybook/addon-knobs. These functions receive a name and a default value to pass to the component, while at the same time gathers info to allow the user to edit React props dynamically using the Storybook UI.

You can now run npm run storybook, open http://localhost:6006/ and voilà. 🎉

Prepare your project to be used by others

• Create a index.ts exporting the files you want to expose:

export { default as StyledButton } from './styled-button/styled-button';

• Update package.json with your main entry file: "main": "build/lib/index.js",

• Do npm link on your bob-ross-kit project so that you can use it while developing without having to actually publish to npm.

• Run npm run watch if you want to keep updating your build when your files change.

Consume our lib

• Create a project with create-react-app

• Do npm link bob-ross-kit to install our lib for development

• Now import and use your components:
  

import React from 'react';
import { StyledButton } from 'bob-ross-kit';

const Comp = () => (
    ...
    <StyledButton onClick={() => console.log('clicked')}>Button</StyledButton>
    <StyledButtton disabled>My Button</StyledButton>
    ...
)

Publishing

So far we used npm link, but this will only work while using locally. Next step would be publishing your module into npm, check how to Creating and publishing unscoped public packages or Creating and publishing scoped public packages.

After publishing you just need to install your module as you would install any other npm dependency.

Conclusion

I hope that by the end of this articled I helped you to:

• Configure typescript
• Configure storybook with some good addons and integration with typescript
• Create basic styled-components
• Understand how a app can consume our UI kit

So we got the fundamentals to build a reusable ui kit. But we can still improve it, and we will, in part 2.

Check the source code on of bob-ross-kit on github

Credits

This post is heavily based on Shawn Wang egghead's course "Design Systems with React and Typescript in Storybook". I did some tweaks and started adding some features on top of whats accomplished by the end of that course.

If you find any error, be it on my poor english or any technical detail, please don't be shy and tweet me about it. I'll try to continuously improve this blog post :simple_smile: