Flight Log / Effect-TS/effect-smol #235

feat: implement immutable HashMap module — a Claude Code (Anthropic) flight by Michael Arnaldi

Michael Arnaldi (@mikearnaldi) opened this Claude Code (Anthropic) pull request in Effect-TS/effect-smol on Jul 6, 2025; merged clean in 44 min, merged by @mikearnaldi: +6,172 −222, 9 files, 0 reviews.

All agent flights in Effect-TS/effect-smol · Claude Code flights

Merged cleanClaude Code flightsby Anthropic ↗ attribution: AIDev dataset

Flown by Michael Arnaldi (@mikearnaldi)GitHub ↗— unclaimed

Lines
+6,172 −222
Files
9
Commits
6
Reviews
0
To merge
44 min
Task
feat

Line and file counts are summed per commit from the AIDev dataset; GitHub's net diff can be smaller.

The agent implemented an immutable HashMap module in Effect-TS/effect-smol, building on the existing MutableHashMap and using a Hash Array Mapped Trie (HAMT). The change adds 6172 lines and removes 222 across nine files in six commits. The pull request merged clean after 0.73 hours, with no changes requested.

From the pull request description

## Summary Implements immutable HashMap module, building on the existing MutableHashMap foundation. Provides complete HashMap API compatibility with the original Effect library while following effect-smol patterns. This implementation features a complete Hash Array Mapped Trie (HAMT) data structure…

Excerpt (first 300 characters) — the full description is on GitHub.

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Flight timeline

  1. —committedMichael Arnaldi
  2. —committedMichael Arnaldi
  3. —committedMichael Arnaldi
  4. —committedMichael Arnaldi
  5. —committedMichael Arnaldi
  6. —committedMichael Arnaldi
  7. Jul 6, 2025mergedmikearnaldi
  8. Jul 6, 2025closedmikearnaldi

Cite this flight: AgentRiders Flight Log, Effect-TS/effect-smol#235, record updated Nov 3, 2026, https://agentriders.com/logs/Effect-TS/effect-smol/235/

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