fec-web-workers

Development

Use when moving expensive browser work off the main thread with Web Workers, SharedWorker, worker pools, Comlink, transferable objects, Vite/Webpack worker integration, or UI responsiveness fixes. Do not use for lightweight synchronous work or DOM manipulation; Chinese triggers include Web Worker, 后台线程, 主线程阻塞.

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/performance/fec-web-workers-bovinphang-frontend-craft-2/SKILL.md

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Web Workers

Purpose

把昂贵计算移出主线程，保持输入、滚动和动画响应。

Procedure

先确认瓶颈：任务超过约 10ms、用户输入延迟明显、FPS 下滑或大文件解析/图像处理/加密计算才考虑 Worker。
选择通信模型：简单任务用 postMessage，函数式 RPC 用 Comlink，大量并行小任务用 Worker pool，跨 Tab 同步用 SharedWorker。
设计消息协议：请求/响应类型、错误类型、取消或超时策略都要明确。
传大对象时优先 Transferable Objects；不要让结构化克隆吞掉 Worker 带来的收益。
在组件或页面卸载时 terminate()，并通过 Profiler、Performance 面板或 FPS 指标验证主线程改善。

Detailed References

Load references/basic-worker.md for plain Worker files, bundler imports, React lifecycle wrapping, and cleanup.
Load references/advanced-workers.md for Transferable Objects, Comlink, Worker pools, SharedWorker, CSP, and SharedArrayBuffer notes.

Constraints

Worker 内不能访问 DOM、window、document、alert() 或同步 localStorage。
高频通信可能比主线程计算更慢；先测量再拆分。
Worker 文件必须同源加载，并受 worker-src CSP 限制。
大型二进制数据优先 transfer，transfer 后原引用会失效。
每个 Worker 有独立 JS 堆，必须主动管理生命周期和内存。

Expected Output

计算密集型操作在后台线程执行，主线程输入和滚动恢复流畅，错误与取消路径明确，Worker 在卸载时被终止且无内存泄漏。