some work on supporting `piscina`

[alii]

trafficstars

What does this PR do?

Fixes #19924 Fixes #13218

• [ ] Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• [x] Code changes

How did you verify your code works?

third party test (but will likely need to do more since there are worker related changes)

[robobun]

^{Updated 4:21 PM PT - Oct 20th, 2025}

:x: @alii, your commit a45c2632c3b38a16fdf710d36369bbd54861c94d has 1 failures in Build #29763 (All Failures):

• src/bun.js/event_loop.zig - zig error on 🐧 x64 - build-zig
• src/bun.js/event_loop.zig - zig error on 🐧 aarch64 - build-zig
• src/bun.js/event_loop.zig - zig error on 🪟 x64-baseline - build-zig
• src/bun.js/event_loop.zig - zig error on 🐧 x64-musl-baseline - build-zig
• src/bun.js/event_loop.zig - zig error on 🍎 x64 - build-zig
• src/bun.js/event_loop.zig - zig error on 🐧 aarch64-musl - build-zig
• src/bun.js/event_loop.zig - zig error on 🐧 x64-musl - build-zig
• src/bun.js/event_loop.zig - zig error on 🐧 x64-baseline - build-zig
• src/bun.js/event_loop.zig - zig error on 🪟 x64 - build-zig
• src/bun.js/event_loop.zig - zig error on 🍎 aarch64 - build-zig
• src/bun.js/event_loop.zig - zig error on 🐧 x64-asan - build-zig

---

🧪   To try this PR locally:

bunx bun-pr 19940

That installs a local version of the PR into your bun-19940 executable, so you can run:

bun-19940 --bun

[190n]

This assertion failure in test-worker-message-port-transfer-terminate is interesting: https://buildkite.com/bun/bun/builds/18199#01974255-d25e-4706-8891-290500bfd29b/2013-2014

Trying to repro

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✨ Finishing Touches

🧪 Generate unit tests

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment
• [ ] Commit unit tests in branch ali/piscina

---

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