# About React Principal
React Principal is a state-management package based on react-context which introduces several hooks to do so.
Actually, react-principal is a wrapper for react context with better developer experience.
High performance since provided observed connect to context.
It's useful for global state management and complex component state.
React-Principal internally used React.reducer for state.
### Pros
Why should you use react-principal?
Because react-principal is:
- Ability to persist data using local storage and session
- Ability to create multiple providers for any component
- Pass data easily between various pages and tabs
- Applicable in both global and component-based levels
- Automatic store generation (CLI)
- TypeSafe
- High Performance
- User Friendly
- Minimum Complexity
### Built With
- [React](https://react.com)
## Getting Started
All you need as a requirement for this package is to have a project created by react.
### Installation
To add react-principal to your project, simply install it using npm or yarn:
- npm
```sh
npm install react-principal
```
- yarn
```sh
yarn add react-principal
```
## Usage
Before anything, you should be familiar with react reducer pattern.
```js
import { createStore, Provider } from "react-principal";
const store = createStore({ reducer, initialState });
function Component() {
const { foo, bar } = store.useState();
const dispatch = store.useDispatch();
return (
<>
{foo} {bar}
);
}
// The provider can be wrapped on any desired component, where you want to generate a store.
function App() {
;
}
```
### Performance
```js
//Define states which you want to update when they changed. If is not defined store listen to whole states change
const { foo, bar } = store.useState(["foo", "bar"]);
// Dispatch is devided from state for performance enhancement, because dispatch functions never change.
const dispatch = store.useDispatch();
```
### persist
```js
const store = createStore({
reducer,
initialState,
// config a persister
// window.localStorage, window.sessionStorage, AsyncStorage supported
storage: window.localStorage,
persistKey: "UniqKey",
mapStateToPersist: ({ todos }) => ({
todos, // persist just todos
}),
});
export default () => {
// you can save ref in global place for access to state and dispatch out of children components like `store.state`
// Doesn't need middleWare like redux, storeRef working vary well
useEffect(() => {
store.setToState();
}, []);
return (
);
};
```
### ProvidersList
This component is for organization of multiple providers. Simply give the 'providers' prop, an array of your providers.
```js
function App() {
return (
{appContainer}
);
}
```
### Generator
React-principal has a command for auto generating store.
`$ generate-store `
Options
--type= Default value is set on 'global', 'single' option will create store in a single file, reducer is using with useReducer,
##### Example:
`$ generate-store ./src/store`
Generate a sample store into src/store
`$ generate-store ./src/myComponent --type=reducer`
Generate a sample reducer action for using in useReducer into src/myComponent
## API
| Name | Requirement | Type | Description |
| ----------------- | :---------: | :----------------------------------------: | :-------------------------------------------------------------------------------: |
| reducer | required | function | Pass your reducer function which is created via 'createReducer'. |
| initialState | required | object | Here you can set the initial values that are going to be saved inside store. |
| storage | optional | localStorage, sessionStorage, AsyncStorage | Choose from window.localStorage, window.sessionStorage, or AsyncStorage. |
| persistKey | optional | string | To set a specific key to save data in the desired storage. |
| mapStateToPersist | optional | function | A function which gets 'state' as an argument and saves it in the desired storage. |
## Utils
[Utils Readme.md](UtilsReadme.md).
## Examples
Visit 'examples' folder for a better understanding of react-principal usage.
Also, if you need to have a quick setup of this package on your project, you can check 'templates' folder.
A simple [Todo list App](https://github.com/hosseinmd/react-principal/blob/master/examples/web/src/app.js)
## Contributing
Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are **greatly appreciated**.
1. Fork the Project
2. Create your Feature Branch (`git checkout -b feature/AmazingFeature`)
3. Commit your Changes (`git commit -m 'Add some AmazingFeature'`)
4. Push to the Branch (`git push origin feature/AmazingFeature`)
5. Add tests if necessary and run tests (`yarn test`)
6. Open a Pull Request
## Contact
Hossein Mohammadi: hosseinm.developer@gmail.com
Project Link: [https://github.com/hosseinmd/react-principal](https://github.com/hosseinmd/react-principal)
## Acknowledgements
- [redux](https://redux.js.org/)
- [react-context](https://reactjs.org/docs/context.html)
---
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