Use-global-hook-ts NPM

use-global-hook-ts

State management for React using Hooks with Typescript.

Requirements

This library needs React and ReactDOM as peer dependencies with a version greater than 16.8 because Hooks have been introduced in that version.

Installation

npm i use-global-hook-ts

Docs

The method useGlobalHook accept four paramters: 1. React: Your instance of React; 2. initialState: the initial state of your app; 3. options: store configurations: - persistTree: a subset of app state's keys with boolean values that will be saved and auto refilled on page reload OR true if you want to save all the state OR false if you want to save nothing; - persistExp: you can pass the number of seconds after which the stored state will be discarded; - debug: if true each action that change the state of app will be logged in console; - undoable: if true you will enable the undo/redo features; - maxUndoable: you can pass here the max number of undo/redo history that you want to use; - More options will come soon!

import createStore, { IStore } from 'use-global-hook-ts'

interface IAppState {
  movies: string[],
  loggedUser: any
}

const initialState: IAppState = {
  movies: [],
  loggedUser: null
}

const { useGlobal, store } = createStore(React, initialState, {
  debug: true,
  persistTree: {
    movies: false,
    loggedUser: true
  },
  persistExp: 60,
  undoable: true,
  maxUndoable: 10
})

const actions = {
  movies: {
    addMovie: (movie: string) => {
      const newMovies = [ ...store.state.movies, movie ]
      const newState = { ...store.state, movies: newMovies }
      store.setState(newState)
    }
  }
}

Inside each action you have to use the method setState of store in order to change the app state and you can also read the latter using the property state of the store.

When call useGlobal inside a component you can pass an object with a sub set of app state's keys with boolean values. The component will be updated only when the sub set of app state will change (see Example).

useGlobal returns two elements when is called inside a component: 1. globalState: last version of the app state; 3. lastChanges: last changes made on the app state (null if no changes are made yet).

Immutability

With the option freezable the app state is immutable (by a deep freeze function) in order to guarantee that any component can't change it without using the actions. If you try to directly mutate the state in strict mode, it will throw an error, otherwise it will fail silently.

Persist

With the option persistTree you can achieve almost all of what you can do with redux-persist blacklist and whitelist. If you want to save only some keys of your app state, just set them with true inside the persistTree. In a similar manner, if you want to exclude some other keys, set them to false. For example, if your app state is:

const appState = {
  someData: [1, 2, 3],
  tmpData: 'Tmp'
}

If you want to save only someData you can use a persistTree like:

const persistTree = {
  someData: true
}

Class component

You can use this package also with class components wrapping them into a HOC Component (see Example).

Undo/Redo

The createStore returns the property historyActions with the methods undo and redo that you can use respectively in order to revert or reapply the last action. You have to pass undoable: true in the options of the store in order to use this feature.

This feature will be improved in the next releases.

React Native

You can use this library also for React Native development but, for the moment, you will have to set persistTree option to false.

Basic example

import React from 'react'
import createStore, { IStore, store } from 'use-global-hook-ts'

interface IAppState {
  text: string,
  data: string
}

const initialState: IAppState = {
  text: 'Hello',
  data: 'Useless'
}

const { useGlobal, store } = createStore(React, initialState, {
  debug: true
})

const actions = {
  changeText: (newText: string) => {
    store.setState({ text: newText })
  }
}

const ExampleComponent = (_: any) => {
  const [globalState, lastChanges] = useGlobal()
  React.useEffect(() => {
    setTimeout(() => {
      actions.changeText('New text')
    }, 1000)
  }, [])
  console.log('ExampleComponent render. Last changes', lastChanges)
  return <span>{globalState.text}</span>
}

const AnotherComponent = (_: any) => {
  const [globalState] = useGlobal({
    data: true
  })
  console.log('AnotherComponent render')
  return <span>{globalState.text}</span>
}

class ClassComponent extends React.Component<{ text: string }> {
  render() {
    return <span>{this.props.text}</span>
  }
}

const HOCWithGlobalHook = (_: any) => {
  const [globalState] = useGlobal({
    text: true
  })
  console.log('HOCWithGlobalHook render')
  return <ClassComponent text={globalState.text} />
}
const Wrapper = (_: any) => {
  return <>
    <ExampleComponent/>
    <AnotherComponent/>
    <HOCWithGlobalHook/>
  </>
}