FluentStates

Easy and clear state management for Angular apps.

Getting Started

Install package and dependencies.

yarn add @typeheim/fire-rx
yarn add @typeheim/fluent-states
//or
npm install @typeheim/fluent-states
npm install @typeheim/fire-rx

Overview

Key components of FluentStates are StateModel and StreamStore. StreamStore define store of a state and then StateModel control all of the read and write access to the state.

Working with state model

Defining store model

First of all, you need to define store. Store is a calls that consist of observables that contain data. All of the state observables must be public but you can have private/protected observables as well to create any pipes.

import {StreamStore, State} from '@typeheim/fluent-states'
import {StatefulSubject, ValueSubject} from '@typeheim/fire-rx'
import {map, Subject} from 'rxjs'

export class BookStore extends StreamStore {
  private securityArchive = new ValueSubject([])

  public shelfStream = new StatefulSubject()

  public archiveStream = new ValueSubject([])

  public visitorsStream = new Subject()

  public securityArchiveIdentifiersStream = this.securityArchive.pipe(map(item => item.id))
}

// define state type to use in type definitions further on
export type BookState = State<BookStore>

Once you defined store, you can get readonly state that consist of all of the public properties.

const store = new BookStore()
const state = store.getState()

Defining state model

Once you defined store, you can define state model by extending it from StateModel and implementing store property. Then you can define any methods to manipulate state through store.

import {StateModel} from '@typeheim/fluent-states'

export class BookStateModel<BookStore> extends StateModel {
  protected store = new BookStore()

  public addBooks(boooks) {
    this.store.shelfStream.next(books)
  }

  public mooveBooksToArchive(boooks) {
    this.store.archiveStream.next(books)
  }
}

State model provide access to readonly state through readonly property state.

const bookStateModel = new BookStateModel()
const bookState = stateModel.state