devtools.fm: Developer Tools, Open Source, Software Development Charles Lowell - Frontside, Effection, and Structured Concurrency
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Mar 10, 2025 In this discussion, Charles Lowell, a developer and consultant known for the Effection library, dives into structured concurrency in JavaScript. He breaks down how structured concurrency can solve the limitations of promises and improves resource management. The conversation includes insights into enhancing developer experience with tools like Backstage and the significance of 'affection' in managing concurrent operations. Lowell also touches on debugging challenges and the forthcoming V4 release, emphasizing community engagement in JavaScript asynchrony.
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Structured Concurrency
- Structured concurrency ties the lifetime of concurrent processes to lexical scope, preventing resource leaks.
- This allows you to build abstractions, making every operation atomic, unlike with promises.
Promise Leaks
promise.raceandpromise.allcan cause memory leaks in JavaScript, especially under heavy load.- These leaks are hard to detect during development due to their subtle nature.
Async/Await Limitations
- Async/await's biggest flaw is the inability to control an async function once it awaits a promise.
- This can lead to resource leaks if the promise never resolves, affecting the entire call stack.