@kaiverse/signal
v0.2.3
Published
A simple reactive system for your Javascript application
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90
Maintainers
Readme
This package draws strong inspiration from KnockoutJS's concepts and SolidJS's Signal, enabling us to use Signals in vanilla JavaScript. JS Signals proposal is currently in Stage 1.
Installation
Via npmjs
npm i @kaiverse/signal
pnpm add @kaiverse/signal
Via jsr
deno add @kaiverse/signal
npx jsr add @kaiverse/signal
pnpm dlx jsr add @kaiverse/signal
Via CDN:
unpkg.com/@kaiverse/signal
Compatibility
Signal is a Proxy
object at its core, please check compatibility section.
Documentation
Example
🔗Signal Proxy
/**
* ```html
* <p id="fetch-result"></p>
* <button type="button" onclick="fetchNextUser()">Get next user</button>
* ```
*/
import {signalProxy} from '@kaiverse/signal';
const resultElement = document.getElementById('fetch-result');
const userSignal = signalProxy({userId: 123, reqCount: 0}, async (key, newValue) => {
// Do something when any userSignal's prop value changes
console.log(`[userSignal updated] key: ${key}, value: ${newValue}`);
if (key === 'userId') {
// Do something on `userId` changes only
const userId = newValue;
const response = await fetch(`${basePath}/user/${userId}`);
const userData = await response.json();
const totalReqCount = userSignal.reqCount + 1;
userSignal.reqCount = totalReqCount;
if (resultElement)
resultElement.innerHTML = `Name: ${userData.name}<br/>Total requests: ${totalReqCount}`;
}
});
function fetchNextUser() {
userSignal.userId++;
}
🚦Signal utilities
If you have experience with SolidJS or ReactJS, you'll find these utility functions very familiar.
import {createComputed, createEffect, createSignal} from '@kaiverse/signal';
const [count, setCount] = createSignal(0);
setInterval(() => {
setCount((c) => c + 1); // or setCount(count() + 1)
}, 1000);
createEffect(() => {
// log the count signal's value to the console every 1 second
console.log('count =', count());
});
const doubled = createComputed(() => count() * 2);
createEffect(() => {
console.log('[computed] doubled =', doubled());
});
Framework ports?
React
React signal hooks implementation. Experimental. DO NOT use in production.
Those hooks work, but its lack of testing and seems that the usage of memory is inefficient. An alternative approach may be better. Please feel free to open PRs. Your contributions are welcomed and appreciated.
React playground (codesandbox) - source code