javascript / expert
Snippet
Symbol.asyncDispose Integration for Explicit Resource Teardown in Custom React Hooks
Explicit Resource Management introduces Symbol.asyncDispose to safely clean up asynchronous connections such as WebSockets or database sockets. In React effect hooks, executing async teardowns via Symbol.asyncDispose prevents dangling promises and ensures resources close deterministically when components unmount.
snippet.js
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import { useEffect } from 'react';export function useExplicitAsyncResource(createResource) {useEffect(() => {let activeResource;async function init() {activeResource = await createResource();}init();return () => {if (activeResource && typeof activeResource[Symbol.asyncDispose] === 'function') {activeResource[Symbol.asyncDispose]().catch(console.error);}};}, [createResource]);}
react
Breakdown
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if (activeResource && typeof activeResource[Symbol.asyncDispose] === 'function')
Checks whether the resolved resource object implements the Explicit Resource Management async protocol.
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activeResource[Symbol.asyncDispose]().catch(console.error);
Triggers the async disposer method safely inside effect cleanup without blocking synchronous execution.