A state management package for React without use React Context or Redux

Requirement

If your project use typescript then you need to add options: emitDecoratorMetadata: true, experimentalDecorators: true to tsconfig.json.

Else need to install babel-plugin-transform-decorators-legacy and follow one of bellow configs:

• .babelrc

{
  "presets": ["es2015", "stage-0", "react"],
  "plugins": [
    ["transform-decorators-legacy"],
    // ...
  ]
}

• Or Webpack

{
  test: /\.jsx?$/,
  loader: 'babel',
  query: {
    cacheDirectory: true,
    plugins: ['transform-decorators-legacy' ],
    presets: ['es2015', 'stage-0', 'react']
  }
}

How to use

1. Create folder structure in your src folder (if exist) like this:

- store
  - index.{ts|js}
  - states
    - test.{ts|js}

2. In store/states/test file

• add @listen to which property that you want to trigger store change when it changed

import { listen } from "r-hsm";

export default class Test {
  @listen
  counter: number = 0;

  public setCount() {
    this.counter = this.counter + 1;
  }
}

3. In store/index file

import { mapStates } from "r-hsm";

import Test from "./states/test";

export const createStore = mapStates({
  testState: new Test()
});

// if use typescript
export type RootState = ReturnType<typeof createStore>;

4. In your App.js or index.js

...
import { createStore } from "./store";

createStore();

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById("root")
);

5. Use in component

...
import { RootState } from "./store";
import { useHSM } from "r-hsm";

function MyPage() {
  const { states, watchValue } = useHSM<RootState, number>(
    rootState => rootState.testState.counter
  );

  return (
    <div className="my-page">
       <p onClick={()=>{states.testState.setCount()}}>Click me</p>
       <p>Counter: {watchValue}</p>
    </div>
  );
}
export default MyPage;

6. Access other states

import { listen } from "r-hsm";
import { RootState } from "..";

export default class Test {
  @listen
  counter: number = 0;

  rootState: RootState|null = null

  public setCount() {
    this.counter = this.counter + 1;
    this.rootState!.otherState.actionInOtherState();
  }
}