Teaful

• 📦 ・Tiny: Less than 1kb package to manage your state in React and Preact.
• 🌱 ・Easy: You don't need actions, reducers, selectors, connect, providers, etc. Everything can be done in the simplest and most comfortable way.
• 🚀 ・Powerful: When a store property is updated, only its components are re-rendered. It's not re-rendering components that use other store properties.

` | `false` | Object with your initial store. | | `onAfterUpdate` | `function` | `false` | Function that is executed after each property change. More [details](#register-events-after-an-update-). | _Output:_ | name | type | description | example | | ----------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------- | | `useStore` | `Proxy` | Proxy hook to consume and update store properties inside your components. Each time the value changes, the component is rendered again with the new value. More [info](#usestore-hook). | `const [price, setPrice] = useStore.cart.price()` | | `getStore` | `Proxy` | Similar to `useStore` but without subscription. You can use it as a helper outside (or inside) components. Note that if the value changes, it does not cause a rerender. More [info](#getstore-helper). | `const [price, setPrice] = getStore.cart.price()` | | `setStore` | `Proxy` | It's a proxy helper to modify a store property outside (or inside) components. More [info](#setstore-helper). | `setStore.user.name('Aral')` or `setStore.cart.price(price => price + 10)` | | `withStore` | `Proxy` | HoC with `useStore` inside. Useful for components that are not functional. More [info](#withstore-hoc). | `withStore.cart.price(MyComponent)` | ### How to export We recommend using this type of export: ```js // ✅ export const { useStore, getStore, withStore } = createStore({ cart: { price: 0, items: [] }, }); ``` This way you can import it with: ```js // ✅ import { useStore } from '../store' ``` Avoid using a default export with all: ```js // ❌ export default createStore({ cart: { price: 0, items: [] } }); ``` Because then you won't be able to do this: ```js // ❌ It's not working well with proxies import { useStore } from '../store' ``` ## Manage the store 🕹 ### useStore hook It's recommended to use the `useStore` hook as a proxy to indicate exactly what **portion of the store** you want. This way you only subscribe to this part of the store avoiding unnecessary re-renders. ```js import createStore from "teaful"; const { useStore } = createStore({ username: "Aral", count: 0, age: 31, cart: { price: 0, items: [], }, }); function Example() { const [username, setUsername] = useStore.username(); const [cartPrice, setCartPrice] = useStore.cart.price(); return ( <> setUsername("AnotherUserName")}> Update {username} setCartPrice((v) => v + 1)}> Increment price: {cartPrice}€ ); } ``` However, it's also possible to use the `useStore` hook to use **all the store**. ```js function Example() { const [store, setStore] = useStore(); return ( <> setStore((s) => ({ ...s, username: "AnotherUserName", })) } > Update {store.username} setStore((s) => ({ ...s, cart: { ...s.cart, price: s.cart.price + 1 }, })) } > Increment price: {store.cart.price}€ ); } ``` _Input:_ | name | type | description | example | | --------------------- | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Initial value | `any` | This parameter is **not mandatory**. It only makes sense for new store properties that have not been defined before within the `createStore`. If the value has already been initialized inside the `createStore` this parameter has no effect. | `const [price, setPrice] = useStore.cart.price(0)` | | event after an update | `function` | This parameter is **not mandatory**. Adds an event that is executed every time there is a change inside the indicated store portion. | `const [price, setPrice] = useStore.cart.price(0, onAfterUpdate)`

And the function:

`function onAfterUpdate({ store, prevStore }){ console.log({ store, prevStore }) }`

| _Output:_ Is an `Array` with **2** items: | name | type | description | example | | ------------ | ---------- | --------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | value | `any` | The value of the store portion indicated with the proxy. | A store portion

`const [price] = useStore.cart.price()`

All store:

`const [store] = useStore()`

| | update value | `function` | Function to update the store property indicated with the proxy. | Updating a store portion:

`const [count, setCount] = useStore.count(0)`

Way 1:

`setCount(count + 1)`

Way 1:

`setCount(c => c + 1)`

-------

Updating all store:

`const [store, updateStore] = useStore()`

Way 1:

`updateStore({ ...store, count: 2 }))`

Way 1:

`updateStore(s => ({ ...s, count: 2 }))`

| ### setStore helper Useful helper to modify the store from anywhere (outside/inside components). Example: ```js const initialStore = { count: 0, name: 'Aral' } const { setStore } = createStore(initialStore); const resetStore = () => setStore(initialStore); const resetCount = () => setStore.count(initialStore.count); const resetName = () => setStore.name(initialStore.name); // Component without any re-render (without useStore hook) function Resets() { return ( <> Reset store Reset count Reset name ); } ``` Another example: ```js const { useStore, setStore } = createStore({ firstName: '', lastName: '' }); function ExampleOfForm() { const [formFields] = useStore() return Object.entries(formFields).map(([key, value]) => ( { // Update depending the key attribute setStore[key](e.target.value) }} /> )) } ``` This second example only causes re-renders in the components that consume the property that has been modified. In this way: ```js const [formFields, setFormFields] = useStore() // ... setFormFields(s => ({ ...s, [key]: e.target.value })) // ❌ ``` This causes a re-render on all components that are consuming any of the form properties, instead of just the one that has been updated. So using the `setStore` proxy helper is more recommended. ### getStore helper It works exactly like `useStore` but with **some differences**: - It **does not make a subscription**. So it is no longer a hook and you can use it as a helper wherever you want. - It's **not possible to register events** that are executed after a change. ```js getStore.cart.price(0, onAfterPriceChange); // ❌ function onAfterPriceChange({ store, prevStore }) { // ... } ``` - If the intention is to register events that last forever, it has to be done within the `createStore`: ```js const { getStore } = createStore(initialStore, onAfterUpdate); // ✅ function onAfterUpdate({ store, prevStore }) { // .. } ``` Very useful to use it: - **Outside components**: helpers, services, etc. - **Inside components**: Avoiding rerenders if you want to consume it inside events, when you only use the updater `const [, setCount] = getStore.count()`, etc. Example: ```js import { useState } from "react"; const initialStore = { count: 0 } const { getStore } = createStore(initialStore); function Example1() { return ( { const [, setStore] = getStore(); setStore(initialStore) }}> Reset store ); } function Example2() { const [newCount, setNewCount] = useState(); function saveIncreasedCount(e) { e.preventDefault(); const [count, setCount] = getStore.count(); if (newCount > count) setCount(newCount); else alert("You should increase the value"); } return (

setNewCount(e.target.valueAsNumber)} type="number" /> Save the increased count value

); } ``` ### withStore HoC It's a wrapper of the `useStore` for non-functional components. Where you receive the same thing that the `useStore` hook returns inside `this.props.store`. Example with a store portion: ```js const { withStore } = createStore(); class Counter extends Component { render() { const [count, setCount] = this.props.store; return (

{count}

setCount((v) => v + 1)}>+ setCount((v) => v - 1)}>- setCount(0)}>reset

); } } // Similar to useStore.counter.count(0) const CounterWithStore = withStore.counter.count(Counter, 0); ``` Example with all store: ```js const { withStore } = createStore({ count: 0 }); class Counter extends Component { render() { const [store, setStore] = this.props.store; return (

{store.count}

setStore({ count: store.count + 1 })}>+ setStore({ count: store.count - 1 })}>- setStore({ count: 0 })}>reset

); } } // Similar to useStore() const CounterWithStore = withStore(Counter); ``` The **only difference** with the `useStore` is that instead of having 2 parameters (initialValue, onAfterUpdate), it has 3 where the **first one is mandatory** and the other 2 are not (**Component**, **initialValue**, **onAfterUpdate**). ## Register events after an update 🚦 It is possible to register an event after each update. This can be useful for validating properties, storing error messages, optimistic updates... There are 2 ways to register: - **Permanent** events: Inside `createStore`. This event will always be executed for each change made within the store. ```js export const { useStore, getStore } = createStore( initialStore, onAfterUpdate ); function onAfterUpdate({ store, prevStore }) { // Add an error msg if (store.count > 99 && !store.errorMsg) { const [, setErrorMsg] = getStore.errorMsg(); setErrorMsg("The count value should be lower than 100"); return; } // Remove error msg if (store.count <= 99 && store.errorMsg) { const [, setErrorMsg] = getStore.errorMsg(); setErrorMsg(); } } ``` - **Temporal** events: Inside `useStore` / `withStore`. These events will be executed for each change in the store (or indicated portion) **only during the life of the component**, when the component is unmounted the event is removed. ```js function Count() { const [count, setCount] = useStore.count(0, onAfterUpdate); const [errorMsg, setErrorMsg] = useStore.errorMsg(); // The event lasts as long as this component lives function onAfterUpdate({ store, prevStore }) { // Add an error msg if (store.count > 99 && !store.errorMsg) { setErrorMsg("The count value should be lower than 100"); return; } // Remove error msg if (store.count >= 99 && store.errorMsg) { setErrorMsg(); } } return ( <> {errorMsg &&

{errorMsg}

}

{count}

setCount((v) => v + 1)}>Increment ); } ``` ## How to... 🧑‍🎓 ### Add a new store property You can use `useStore` / `getStore` / `withStore` even if the property does not exist inside the store, and create it on the fly. ```js const { useStore } = createStore({ username: "Aral" }); function CreateProperty() { const [price, setPrice] = useStore.cart.price(0); // 0 as initial value return

Price: {price}

; } function OtherComponent() { // store now is { username: 'Aral', cart: { price: 0 } } const [store] = useStore(); console.log(store.cart.price); // 0 // ... } ``` It's **not mandatory to indicate the initial value**, you can create the property in a following step with the updater. ```js const { useStore } = createStore({ username: "Aral" }); function CreateProperty() { const [cart, setCart] = useStore.cart(); useEffect(() => { initCart(); }, []); async function initCart() { const newCart = await fetch("/api/cart"); setCart(newCart); } if (!cart) return null; return

Price: {cart.price}

; } ``` ### Use more than one store You can have as many stores as you want. The only thing you have to do is to use as many `createStore` as stores you want. store.js ```js import createStore from "teaful"; export const { useStore: useCart } = createStore({ price: 0, items: [] }); export const { useStore: useCounter } = createStore({ count: 0 }); ``` Cart.js ```js import { useCart } from "./store"; export default function Cart() { const [price, setPrice] = useCart.price(); // ... rest } ``` Counter.js ```js import { useCounter } from "./store"; export default function Counter() { const [count, setCount] = useCounter.count(); // ... rest } ``` ### Update several portions avoiding rerenders in the rest If you do this it causes a rerender to all the properties of the store: ```js // 😡 const [store, setStore] = useStore(); setStore({ ...store, count: 10, username: "" }); ``` And if you do the next, you convert the whole store into only 2 properties (`{ count: 10, username: '' }`), and you will remove the rest: ```js // 🥵 const [store, setStore] = useStore(); setStore({ count: 10, username: "" }); ``` If you have to update several properties and you don't want to disturb the rest of the components that are using other store properties you can create a helper with `getStore`. ```js export const { useStore, setStore } = createStore(initialStore); export function setFragmentedStore(fields) { Object.entries(fields).forEach(([key, value]) => { setStore[key](value); }); } ``` And use it wherever you want: ```js // 🤩 import { setFragmentedStore } from "./store"; // ... setFragmentedStore({ count: 10, username: "" }); ``` ### Define calculated properties It's possible to use the `setStore` together with the function that is executed after each update to have store properties calculated from others. In this example the cart price value will always be a value calculated according to the array of items: ```js export const { useStore, setStore } = createStore( { cart: { price: 0, items: [], }, }, onAfterUpdate ); function onAfterUpdate({ store }) { const { items, price } = store.cart; const calculatedPrice = items.length * 3; // Price always will be items.length * 3 if (price !== calculatedPrice) { setStore.cart.price(calculatedPrice); } } ``` It's an anti-pattern? Not in Teaful 😊. As only the fragments of the store are updated and not the whole store, it is the same as updating both properties (`cart.items` and `cart.price`) instead of just `cart.items`. The anti-pattern comes when it causes unnecessary rerenders, but this is not the case. Only the components that use `cart.items` and `cart.price` are rerendered and not the others. ## Teaful Devtools 🛠 To debug your stores, you can use [Teaful DevTools](https://github.com/teafuljs/teaful-devtools). ## Addons and extras 🌀 To facilitate the creation of libraries that extend Teaful (such as [`teaful-devtools`](https://github.com/teafuljs/teaful-devtools)), we allow the possibility to add an extra that: - Have access to everything returned by each `createStore` consumed: `getStore`, `useStore`, `withStore`. - Return an object with new elements to be returned by each `createStore`. It's optional, if nothing is returned it will continue to return the usual. If, for example, you return `{ getCustomThing }` will do an assign with what is currently returned by the `createStore`. - Ability to **subscribe**, **unsubscribe** and **notify** in each `createStore`. For that, use the `createStore.ext` function. teaful-yourlib: ```js import createStore from 'teaful' createStore.ext(({ getStore, }, subscription) => { // s = subscribe (minified by Teaful) // "." -> all store // ".cart" -> only inside cart // ".cart.price" -> only inside cart.price // n = notify (minified by Teaful) // u = unsubscribe (minified by Teaful) subscription.s(".", ({ store, prevStore }) => { // This will be executed in any store (".") change. }); // optional return { getCustomThing: () => console.log('example') } }) ``` Then, your library should be imported at the top: ```js import 'teaful-yourlib' import { render } from 'preact'; import App from './components/App'; render(, document.getElementById('root')); ``` ## Examples 🖥 We will expand the examples over time. For now you can use this Codesandbox: - [Example of store - CodeSandbox](https://codesandbox.io/s/teaful-example-4p5dv?file=/src/store.js) - [Counter with ESM](https://github.com/teafuljs/teaful/tree/master/examples/counter-with-esm) - [Todo list](https://github.com/teafuljs/teaful/tree/master/examples/todo-list) - [Example with an API list](https://github.com/teafuljs/teaful/blob/master/examples/api-list/README.md) ## Roadmap 🛣 **For 1.0**: - [x] React support - [x] Teaful DevTools - [x] TypeScript types support - [x] Migrate full Teaful project to TypeScript - [ ] React Native support - [ ] Vanilla JavaScript support - [ ] Create a documentation website - [ ] Add more examples: with Next.js, Remix, Preact, React Native... **Optional for 1.0 (else +1.0):** - [ ] Svelte support - [ ] Vue support - [ ] Solid support _If you think that there is something that should be preindicated by version 1.0 please report it as an issue or discussion 🙏_ ## Contributors ✨ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):

Aral Roca Gomez 🚧 💻	Danielo Artola 🚇 💻	Yuki Shindo 🚇	YONGJAE LEE(이용재) 🐛	niexq 📖 🚇	nekonako 📖	Shubham 📖
Siddharth Borderwala 📖 🚇 💻	watcher 💻	Philippe Schommers 💻	ktdd 📖

This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!