create react library with Rollup.js

This branch has been implemented with rollup way, download it and cd in run yarn install, then the output library should be in lib/boundle.js.

Remember to delete node_modules/react manually if you use local link test.

Start from scratch

1.Make folder

mkdir my-react-library

cd my-react-library

mkdir src

2.Install

yarn init -y

yarn add react @emotion/core

yarn add rollup rollup-plugin-babel @babel/core @babel/preset-env @babel/preset-react @emotion/babel-preset-css-prop -D

@emotion/babel-preset-css-prop is a babel preset we gonna use it later.

3. rollup.config.js & .babelrc

create rollup.config.js

import babel from 'rollup-plugin-babel'

export default {
  input: 'src/index.js',
  output: {
    file: './lib/bundle.js', // should be the same as main in package.json
    format: 'cjs'
  },
  plugins: [
    // parse es6 react and emotion syntax
    babel({
      exclude: 'node_modules/**'
    })
  ],
  external: ['react', '@emotion/core'] // exclude 3rd libraries to bundle with
}

.babelrc

{
  "presets": [
    "@babel/preset-env",
    "@babel/preset-react",
    "@emotion/babel-preset-css-prop",
    "minify"
  ]
}

4.package.json

edit package.json

  "main": "./lib/bundle.js",
...
  "scripts": {
    "build": "yarn run rollup -c",
    "start": "yarn run rollup -c -w"
  },

5.Create index.js

src/index.js

// Here is the entries of our components

export { default as Button } from './Button'

6.Create Component

src/Button.js

import React, { useEffect, useState } from 'react'
import { css } from '@emotion/core'

function Button() {
  const [state, setState] = useState(false)

  useEffect(() => {
    setTimeout(() => {
      setState(!state)
    }, 1000)
  })

  const btnStyle = css`
    padding: 10px 20px;
    font-size: 4rem;
    border: none;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  `

  return (
    <button
      css={css`
        ${btnStyle};
        color: ${state ? 'royalblue' : 'hotpink'};
      `}
    >
      Button
    </button>
  )
}

export default Button

7. Build or Watch Build

Build: yarn build

Watch build: yarn start

🌈 That's it! 🎉

Use library in you react project locally

1. cd my-react-library

2. run yarn link to registered the link

3. cd react-project go to project folder

4. run yarn link my-react-library

5. Test it

yarn start

Then you will get an error like:

Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:

The easiest way to sole this is go to my-react-library/node_modules and delete react manually

🌈 That's it! 🎉

Publish to npm, finally!!

1.cd my-react-library

2.run yarn publish

Set the version, pass the account then it will be published! 🎉