containrz-core

containrz

@containrz/core is a simple and reactive way to store your data, in any type of javascript/typescript application.

How to use it

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

import { Container } from '@containrz/core'

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 by accessing it's singleton:

const usersData = getContainer(UserContainer)

The way getContainer works is: if there's already an instance of UserContainer, it'll return that instance. If not, it'll create a new one, that will then be returned everytime getContainer is called.

Act when it matters

In order to detect everytime that the state is changed, you can use the subscribeListener function.

const usersData = getContainer(UserContainer)

const unsubscribe = subscribeListener(usersData, () => {
  // do something with the new state!
})

// Whenever the state changes are no longer relevant, just stop listening
unsubscribe()

Note that the subscribeListener function returns another function for unsubscribing. Call it whenever the state is no longer relevant, or on unmount.

Clear everything

If at any point you need to clear all your data (commonly due to a user sign out, for instance), you can simply call clearContainers function. This will remove all the containers stored and managed by @containrz/core.

.destroy()

While clearing the containers, a destroy function will be called. This is so that you can cleanup any backgroud task you may have running.

export class UserContainer extends Container<User> {
  constructor() {
    super()
    this.interval = setInterval(() => {
      // do things.
    }, 5000)
  }

  destroy = () => {
    clearInterval(this.interval)
  }
}

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