nostate

Simple state management for react.

Installation

npm install nostate --save
yarn add nostate

Motivation

This lib is motived by Vue 3 Composition API and redux. There are many disadvantages using the pure Vue 3 Composition API in react. So I introduce the predictability from redux and immutable feature in Composition API. Currently the immutable feature is not fully realized, it is more proper to say the state is unchangeable now, and the fully immutable feature will be like immer and be finished in the version.

Features

• state is immutable
• state is predictable like redux
• No boilerplate code
• Fully typescirpt
• Easy learn, easy write, easy test

Example

count share value

Usage

Component scope state.

Every component has independent state when they use the same setup

import { reactive, reducer } from 'nostate';

const sleep = () => {
  return new Promise((resolve) => {
    setTimeout(resolve, 2000);
  });
};

export const setup = () => {
  const state = reactive({ count: 0 });

  // state can only change in reducer
  const increase = reducer((num: number) => {
    state.count += num;
  });

  // async function and commit data use reducer
  const asyncIncrease = async (num: number) => {
    await sleep();
    increase(num);
  };

  return {
    state,
    increase,
    asyncIncrease,
  };
};

export function App() {
  // state is immutable here
  const setupBinds = useCreateSetup(setup);
  const { state, increase, asyncIncrease } = useSetupBinds(setupBinds);

  return (
    <div>
      <h1>Global Bpp: {state.count}</h1>
      <button onClick={() => increase(1)}>+</button>
      <button onClick={() => asyncIncrease(2)}>async+</button>
    </div>
  );
}

Global scope state

Every component has same state when they use the global setup

import { reactive, reducer, createSetup } from 'nostate';

// create will run wrap function immediately
export const setup = createSetup(() => {
  const state = reactive({ count: 0 });

  const increase = reducer((num: number) => {
    state.count += num;
  });

  return {
    state,
    increase,
  };
});

export function App() {
  const { state, increase } = useSetupBinds(setup);

  return (
    <div>
      <h1>Global Bpp: {state.count}</h1>
      <button onClick={() => increase(1)}>+</button>
    </div>
  );
}

API

reactive

const original: any = { foo: 1 };
const observed = reactive(original);
observed.foo++;
console.log(original.foo); // 2

computed

const value = reactive<{ foo?: number }>({});
const cValue = computed(() => value.foo);
expect(cValue.value).toBe(undefined);
value.foo = 1;
expect(cValue.value).toBe(1);

reducer

state can only change in function wrapped by reducer

const increase = reducer((num: number) => {
  state.count += num;
});