jaredpalmer / Mutik
Licence: mit
A tiny (495B) immutable state management library based on Immer
Stars: ✭ 281
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typescript
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A tiny (495B) immutable state management library based on Immer
Quick Start
yarn add mutik
or
Table of Contents
Example
To use Mutik with React, you'll need to install React and React DOM from the experimental release channel because Mutik uses the recently-merged useMutableSource
hook internally.
yarn add [email protected] [email protected]
import React from 'react';
import { render } from 'react-dom';
import { createStore, Provider, useSelector } from 'mutik';
// Create a lil' store with some state
let store = createStore({
count: 0,
});
// Pass the store to the Provider.
function App() {
return (
<Provider store={store}>
<div>
<Label />
<Buttons />
</div>
</Provider>
);
}
// You can mutate the store from anywhere you want to,
// even outside of React code. Mutate is based on immer.
function increment() {
store.mutate(state => {
state.count++;
});
}
// Or you can update it like React.useState's update
function decrement() {
store.set(prevState => ({
...prevState,
count: prevState.count - 1
});
}
// You don't need to pass the store down as a prop either
function Buttons() {
return (
<React.Fragment>
<button onClick={decrement}>-</button>
<button onClick={increment}>+</button>
</React.Fragment>
);
}
// Lastly, you can subcribe to "slices" of state with useSelector
// Note: be sure to memoize these with React.useCallback if you need to select based on props
function Label() {
const selector = React.useCallback(state => state.count, []);
const count = useSelector(selector);
return <p>The count is {count}</p>;
}
render(<App />, window.root);
API
createStore<S>(intialState: S): Store<S>
Create a Mutik store
given some initial state. The store
has the following API you can use in or out of React.
store
Method | Description |
---|---|
get() |
Get the current state. Do not use this inside of React, you should instead use useSelector
|
set(nextState: S | (prevState: S) => V): void; |
Set state. This can either take a new value or and updater function (just like React.useState's updater) |
on(listener: Function): () => void; |
Subscribe to store. Pass in a callback function that will be executed on updates. on() returns the unsubscribe function for your convenience. |
off(listener: Function): void; |
Unsubscribe a given listener function |
reset(): void |
Set state back to the initialState used when creating the store |
mutate(updater: (draft: Draft) => void | S): void; |
Immer-style updater function. |
useSelector<S, V>(selector: (s: S) => V)
React hook to subscribe to Mutik state. Must be called underneath a Mutik Provider
.
const selector = state => state.count;
function Label() {
const count = useSelector(selector);
return <p>The count is {count}</p>;
}
You can use props with Mutik selector. For performance, it's a good idea to memoize the selector with React.useCallback
. For example:
function User({ id }) {
const selector = React.useCallback(state => state.users[id], [id]);
const user = useSelector(selector);
return <p>The username is {user.name}</p>;
}
<Provider />
Mutik context provider. Pass your store as store
prop. For example:
import React from 'react';
import { createStore, Provider } from 'mutik';
// Create a lil' store with some state
let store = createStore({
count: 0,
});
// Pass the store to the Provider.
function App() {
return (
<Provider store={store}>
<div>{/* ... stuff */}</div>
</Provider>
);
}
Author
- Jared Palmer @jaredpalmer
Inspiration
MIT License
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for each open source project belongs to its rightful owner.
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