doura-react

doura-react

Doura-react includes its own hook APIs, which allow your React Components to subscribe to the doura store and dispatch actions.

• useModel
• useRootModel
• useRootStaticModel
• useSharedModel
• useStaticModel

Installation

Install with npm:

npm install doura-react

Install with yarn

yarn add doura-react

Usage

Use different hooks depends on the scenario

Doura offers multiple hooks for different situations.

useModel would be the first choice if there is no suitable hooks to choose.

useRootModel aims to store global variable that offers for all react components.

useRootStatic aims to store global static data, such as environment variable, only get it at first time.

useSharedModel allows you to share data across specific components, not globally but locally.

useStaticModel allows you to share local static data across specific components.

Examples

Global state management

1. Using <DouraRoot /> component, which makes the state shared by the rest of your app:

// src/index.ts
import * as React from 'react'
import ReactDOM from 'react-dom'
import { DouraRoot } from 'doura-react'
import App from './App'

function App() {
  return ReactDOM.render(
    <DouraRoot>
      <App />
    </DouraRoot>,
    document.getElementById('root')
  )
}

1. Define a model:

// src/model.ts
export const user = defineModel({
  name: 'user',
  state: { name: 'alice', isLogin: false },
  actions: {
    login() {
      this.login = true
    },
  },
})

1. Use hooks to consume the model:

// src/App.tsx
import * as React from 'react'
import {
  ISelectorParams,
  createContainer,
  useRootModel,
} from 'doura-react'
import { user } from './model'

const selector = function (data: ISelectorParams<typeof user>) {
  return data.isLogin
}

export default function App() {
  const [isLogin, { login }] = useRootModel(user, selector)
  return isLogin ? <div>welcome</div> : <div onClick={login}>login</div>
}

Use Doura in a subtree of your app

import * as React from 'react';
import ReactDOM from 'react-dom';
import { createContainer } from 'doura-react';

const { Provider: LocalProvider, useSharedModel, useStaticModel } = createContainer();

function ComponentA() {
    const [state, actions] = usesharedModel(user);
    const [staticState, _] = useStaticModel(user);
    return (
        ...
    )
}

function ComponentB() {
    const [state, actions] = usesharedModel(user);
    const [staticState, _] = useStaticModel(user);
    return (
        ...
    )
}

export default function ComponentWithSharedModel() {
    return (
        <LocalProvider>
            <ComponentA />
            <ComponentB />
        </LocalProvider>
    )
}

Component level

We can replace all useState, useReducer, useMemo and useCallback calls by using useModel.

import { useModel } from 'doura-react'

function Counter() {
  const [state, actions] = useModel({
    state: {
      count: 0,
    },
    actions: {
      increment() {
        this.count += 1
      },
      decrement() {
        this.count -= 1
      },
    },
  })

  return (
    <>
      Count: {state.count}
      <button onClick={actions.decrement}>-</button>
      <button onClick={actions.increment}>+</button>
    </>
  )
}

API

useModel()

import { useModel } from 'doura-react';
const [state, actions] = useModel(model: IModel, selector?: ISelector);

Most of time you would use useModel to extract data from the model. It will create new context everytime you use it.

useRootModel()

import { useRooteModel } from 'doura-react';
const [state, actions] = useRooteModel(model: IModel, selector?: ISelector);

Global Provider context, you can get the global context anywhere, even if the component is unmount, the state will not be destroyed.

useRootStaticModel()

import { useRootStaticModel } from 'doura-react';
const [state, actions] = useRootStaticModel(model: IModel, selector?: ISelector);

useRootStaticModel is similar to useRootModel, the different is that, useRootStaticModel will not rerender on state changed.

createContainer()

It returns a independent scope Provider, useSharedModel, useStaticModel for context and methods to consume models.

import { createContainer } from 'doura-react'
export const { Provider, useSharedModel, useStaticModel } = createContainer()

Provider

In the same Provider context, the state is shared across the store

useSharedModel()

const [state, actions] = useSharedModel(model: IModel, selector?: ISelector);

Share the context across components

useStaticModel()

const [state, actions] = useStaticModel(model: IModel, selector?: ISelector);

useStaticModel is similar to useSharedModel, the different is that, useStaticModel will not rerender on state changed.

useStaticModel doest not support Destructuring Assignment.

Plugin

import React from 'react'
import ReactDOM from 'react-dom'
import App from './App'
import { doura } from 'doura'
import douraLog from 'doura-log'
import persist, { createWebStorage } from 'doura-persist'
import { DouraRoot } from 'doura-react'

const modelManager = doura({
  initialState: {},
  plugins: [
    [douraLog],
    [
      persist,
      {
        key: 'root',
        storage: createWebStorage('local'),
        // whitelist: ['b'],
        blacklist: ['b'],
        migrate: function (storageState: any, version: number) {
          const count = storageState.count
          if (count && count.value >= 3) {
            count.value = 2
          }
          return storageState
        },
      },
    ],
  ],
})

ReactDOM.render(
  <DouraRoot modelManager={modelManager}>
    <App />
  </DouraRoot>,
  document.getElementById('root')
)