Story
Bun has an open PR adding shared-memory threads to JavaScriptCore
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Overview
Shared-memory threads for JavaScriptCore allow functions to run on separate threads while sharing the same heap and objects, eliminating the need for structured cloning or message passing. This experimental feature is currently not functional.
Summary from github.com.
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Community reactions
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Hacker News · github.com
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Based on 5 sampled comments from this thread. Analyzed 2026-06-21.
- Praise: The potential for true parallelism in JavaScript engines could revolutionize performance, making applications more efficient and responsive.
- Praise: The excitement around implementing shared-global multithreading indicates a significant advancement in JavaScript capabilities, which could lead to more powerful web applications.
- Concern: Concerns about the trustworthiness of the codebase and the oversight of a single individual raise significant doubts about the project's stability and reliability.
- Concern: The perception that AI tools are not effective at multi-threading code highlights a critical limitation in current AI capabilities, which could hinder development efforts.
- Concern: The PR's description is criticized for being filled with LLMisms, suggesting a lack of clarity and readability that could impede understanding and adoption.