React UI Library

This is template for creating React JS library. The library can be all TypeScript, all JavaScript, or a mix of both. It also shows how you can manage a SCSS theme in your library for consumption across applications. You can remove this if you don't have a need for this and opt to include CSS inside your components.

It demonstrates the following:

1. Using Rollup.js to build ES and Common JS modules.
2. Bundling images in a library.
3. Demonstrates one approach for managing a CSS theme across consumers of this library.
4. A demo application that uses the library.
5. NPM scripts for live reload of the library during development.
6. Use of jest and @testing/library for React.

I try to update the dependencies frequently, but if you need to use older version of things like React, you should be able to downgrade.

How to use.

This library isn't published publicly, but can be experimented with locally. Here are the steps:

1. Run npm i in the root folder.
2. Run npm link to add the library to your local npm modules.
3. Run npm run build:watch to build the library and watch for changes.
4. Run npm i in the demo folder.
5. Run npm link @pcalouche/react-ui-lib in the demo folder to link the library to your local npm modules.
6. Run npm run start in the demo folder to load the demo.

Run npm run build from the root folder to build the library. This creates dist folder which contains everything that would be published to npm.

Note: If this library was available in a repository, demo's package.json would include "@pcalouche/react-ui-lib": "1.0.0" as a dependency.

Avoiding Multiple Instances Warning With React Hooks

When using npm link @pcalouche/react-ui-lib to develop your library with the demo or another consuming application you may run across React invalid hook call errors.

This happens when you're using React hooks in your consuming application. The application becomes confused between the React installed under node_modules folder and React under the node_modules/@pcalouche-react-ui-lib/node_modules folder. The latter is created by the npm link @pcalouche/react-ui-lib command. The solution is to give your consuming application a hint on which instance of React to use when you have are using npm link. This is not an issue when you install the library from a npm repository. Only when using npm link. The demo uses Create React App. I don't want to eject the config because I like the default setup it provides for me. Thankfully Craco - Create React App Configuration Override exists. See the script configuration in package.json and the craco.config.js on how it's configured. If you're using your own webpack configuration and not Create React App, that's ok too. You'll just need to add an alias references to your webpack config. You'll need to do this for any other library that you bring that has React hooks if your application accesses those hooks. Some common ones are react-router-dom and formik.

TypeScript Only Library Steps

1. No changes needed.

JavaScript Only Library Steps

1. Set allowJs to true in tsconfig.json
2. Convert or remove the TypeScript files.

Mix of TypeScript and JavaScript Library Steps

1. Set allowJs to true in tsconfig.json
2. Convert or remove the TypeScript files as needed.