@containrz/react-hook

@containrz/react-hook is a simpe hook to help you manage your global and local states without any need for configuration and no dependency on context.

How to use it

In order to use @containrz/react-hook, you need to create a class that extends Container, provided on the package.

import { Container } from '@containrz/react-hook'

interface User {
  name: string
  email: string
  phoneNumber: string
}

export class UserContainer extends Container<User> {
  public state = {
    name: '',
    email: '',
    phoneNumber: '',
  }

  public setUser = (user: User) => this.setState(user)

  public setName = (name) => this.setState({ name })

  public setEmail = (email) => this.setState({ email })

  // ...
}

Once you have your container, you can now start sharing its state:

import * as React from 'react'
import { useContainer } from 'containrz'
import { UserContainer } from './UserContainer'

export const App = () => {
  const user = useContainer(UserContainer)

  React.useEffect(() => {
    fetch('/user')
      .then(response => response.json)
      .then(data => user.setUser(data))
  }, [])

  return <input value={user.state.name} onChange={e => user.setName(e.target.value)} />
}

Share globally and locally

If your intention is to share the state globally, you can then use simply the reference to the class inside the useContainer call. However, you can create local states by creating instances of those classes.

export const App = () => {
  // uses the global state for UserContainer
  const user = useContainer(UserContainer)

  return (
    // ...
  )
}

export const App = () => {
  // creates a local state for UserContainer
  const[localUser] = React.useState(new UserContainer())
  const user = useContainer(localUser)

  return (
    // ...
  )
}

In order to configure the behaviour of your local container instance, you can make use of a configuration object as a second parameter.

export const App = () => {
  const [localUser] = React.useState(new UserContainer())
  const user = useContainer(localUser, {
    // whether or not you want the container to be deleted when component unmounts.
    deleteOnUnmount: true,
    // receive a callback with the new state when there's a change
    onUpdate: (nextState) => {},
    // a function to resolve whether or not the changes to the state should trigger a rerender
    shouldTriggerUpdate: (prevState, nextState) => false,
    // An array of keys of the state object that, when changed, triggers a rerender
    // If it's an empty array, it never rerenders.
    watchKeys: ['name'],
  })

  return (
    // ...
  )
}

Note that the options object only acept one option between shouldTriggerUpdate and watchKeys.

Other ways to store your state

containrz also allows you to use different base Containers to store your states in other ways. Read more about it in the subprojects:

• @containrz/container-local-storage
• @containrz/container-indexeddb