React with Hooks + TypeScript + Redux-Observable + Material-UI

Technical Stack

• TypeScript ( https://microsoft.github.io/TypeScript-New-Handbook/chapters/basics/ )
• React 16.12 ( https://reactjs.org/tutorial/tutorial.html, https://reactjs.org/docs/hooks-intro.html )
• RxJS (https://rxjs-dev.firebaseapp.com/api)
• redux-observable ( https://github.com/mitsuruog/react-redux-observable-typescript-sample, https://redux-observable.js.org/docs/basics/Epics.html )
• material-ui ( https://material-ui.com/components/box/ )
• CSS Grid ( https://css-tricks.com/snippets/css/complete-guide-grid/ )
• Redux toolkit ( https://redux-toolkit.js.org/ )

Code Structure

I recommend going through the code as it is pretty self explanatory and requires no prior knowledge of design patterns to understand.

State Management (Redux)

Application state is split mainly in three parts.

• System
• Properties
• Users

Each state structure will be defined by application requirements under that state. Fundamental pieces to build partial root state are:

• slice
• epics
• types

slices

All of actions possible under that partial root state shall be placed here. This slice will create Reducer and its corresponding actions. Example:

const systemSlice = createSlice({
  name: "system",
  initialState: initState as SliceState,
  reducers: {
    requestLoginAction: (state, action: PayloadAction<IUserInput>) => {},
    requestLoginSuccessAction: (state, action: PayloadAction<ISystemState>) => {
      const { admin, status, token } = action.payload;
      state.admin = admin;
      state.status = status;
      state.token = token;
    },
    requestCurrentUserActionSuccess: (
      state,
      action: PayloadAction<ICurrentUser>
    ) => {
      const name = action.payload.name;
      state.name = name;
    },
    requestLoginActionFailure: (state, action: PayloadAction<Error>) => {}
  }
});

epics

This is very redux-observable specific. I recommend going through RxJS first before understanding this. Refer the documentation links given above. Example code:

export const doLoginEpic: Epic<Action, Action, RootState> = action$ =>
  action$.pipe(
    filter(isActionOf(sourceActions.requestLoginAction)),
    switchMap<Action, Observable<Action>>(action =>
      from(doLogin(action.payload)).pipe(
        map(sourceActions.requestLoginActionSuccess),
        catchError(error => of(sourceActions.requestLoginActionFailure(error)))
      )
    )
  );

types

All input and state interfaces can be placed here. Example:

export interface ISystemState {
  readonly admin: Boolean;
  readonly status: string;
  readonly token: string;
  readonly temp: string;
}

export interface IUserInput {
  readonly username: string;
  readonly password: string;
}

Installation

npm install

This project was bootstrapped with Create React App.

Available Scripts

In the project directory, you can run:

npm start

Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.

The page will reload if you make edits.
You will also see any lint errors in the console.

npm test

Launches the test runner in the interactive watch mode.
See the section about running tests for more information.

npm run build

Builds the app for production to the build folder.
It correctly bundles React in production mode and optimizes the build for the best performance.

The build is minified and the filenames include the hashes.
Your app is ready to be deployed!

See the section about deployment for more information.