docs: add examples, reword intro

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Richard 2024-05-31 00:32:08 -07:00
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</div>
**Charm** is an atomic state management library inspired by [Jotai](https://jotai.org). Designed to be a unique alternative to [Reflex](https://littensy.github.io/reflex), Charm aims to provide a simple and composable interface for your game's state.
**Charm** is an atomic state management library inspired by [Jotai](https://jotai.org) and [Nanostores](https://github.com/nanostores/nanostores). Designed to be a more composable alternative to Reflex, Charm aims to address common criticisms of Rodux-like state containers to better address certain use cases.
> [!NOTE]
> Charm is incomplete and not ready for production use.
> The documentation is a work-in-progress! Please refer to the [examples](#🚀-examples) section for more information on how to use Charm.
## 📦 Setup
### TypeScript
Install Charm for roblox-ts using your package manager of choice.
```sh
npm install @rbxts/charm
@ -33,9 +33,7 @@ yarn add @rbxts/charm
pnpm add @rbxts/charm
```
### Wally
Add `littensy/charm` to your `wally.toml` file.
Alternatively, add `littensy/charm` to your `wally.toml` file.
```toml
[dependencies]
@ -86,12 +84,16 @@ import { atom, subscribe } from "@rbxts/charm";
const counterAtom = atom(0);
const doubleCounterAtom = () => counterAtom() * 2;
function incrementCounter() {
counterAtom((count) => count + 1);
}
subscribe(doubleCounterAtom, (value) => {
print(value);
});
counterAtom(1);
counterAtom((count) => count + 1);
incrementCounter();
```
### Counter component
@ -99,23 +101,70 @@ counterAtom((count) => count + 1);
```tsx
import React from "@rbxts/react";
import { useAtom } from "@rbxts/charm";
import { counterAtom } from "./counter-atom";
import { counterAtom, incrementCounter } from "./counter-atom";
function Counter() {
const [count, setCount] = useAtom(counterAtom);
const count = useAtom(counterAtom);
return (
<textlabel
Text={`Count: ${count}`}
Size={new UDim2(0, 100, 0, 50)}
Event={{
Activated: () => setCount(count + 1),
Activated: () => incrementCounter(),
}}
/>
);
}
```
### Server-client sync
Charm provides client and server objects for synchronizing state between the server and clients. Start by defining a module (or creating an object) exporting the atoms you want to sync:
```ts
export { counterAtom } from "./counter-atom";
export { writerAtom } from "./writer-atom";
```
Then, on the server, create a server sync object and pass in the atoms to sync. Use remote events to broadcast state updates and send initial state to clients upon request.
```ts
import { sync } from "@rbxts/charm";
import { remotes } from "./remotes";
import * as atoms from "./atoms";
const server = sync.server({ atoms });
// Broadcast a state update to a specific player
server.connect((player, payload) => {
remotes.sync.fire(player, payload);
});
// Send initial state to a player upon request
remotes.init.connect((player) => {
server.hydrate(player);
});
```
Finally, on the client, create a client sync object and apply incoming state changes.
```ts
import { sync } from "@rbxts/charm";
import { remotes } from "./remotes";
import * as atoms from "./atoms";
const client = sync.client({ atoms });
// Listen for incoming state changes from the server
remotes.sync.connect((payload) => {
client.sync(payload);
});
// Request initial state from the server
remotes.init.fire();
```
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