Gate tui-stories Bun import workaround by runtime version

[schickling-assistant]

Summary

• Restore concurrent story module imports for @overeng/tui-stories on Bun 1.3.14+ and non-Bun runtimes.
• Overlay nixpkgs' Bun package to 1.3.14-canary.1+ca9e0896c, the post-module-loader-rewrite build that fixes Concurrent dynamic import with top level await trigger temporal dead zone oven-sh/bun#20489. There is no stable bun-v1.3.14 GitHub release asset yet; the overlay pins the canary assets by fixed-output hashes.
• Keep the sequential compatibility path for downstreams or shells that still provide Bun <1.3.14.
• Document that Concurrent dynamic import with top level await trigger temporal dead zone oven-sh/bun#20489 was fixed by Upgrade WebKit to 87fd0daba19a (module-loader rewrite) oven-sh/bun#29393.

Benchmark

Synthetic import-scheduler benchmark on local Node v24.14.0, using 48 independent ESM modules with 35ms top-level await each, 7 rounds:

• Serial median: 1714.9ms
• Concurrent median: 42.2ms
• Median speedup: 40.6x
• Median time saved: 1672.7ms

Bun verification

• Old repo/nixpkgs Bun: 1.3.11
• New .#bun: 1.3.14-canary.1+ca9e0896c
• Dynamic import TDZ repro against Nix-built .#bun: five concurrent imports all resolved initialized exports.

Validation

• nix build .#bun --print-build-logs
• nix build .#tui-stories --print-build-logs
• git diff --check

Note: nix flake check --no-build --print-build-logs currently fails while evaluating packages.x86_64-linux.notion-cli-pnpm-deps with path ... packages--overeng-notion-cli-package.json is not valid; this is outside the Bun/tui-stories path. tui-stories, bun, and the overlay all evaluate/build.

Earlier note: dt test:tui-stories --no-tui could not start from this shell because dt was not on PATH and devenv shell hung during Configuring shell; the direct Nix package build passed and includes the CLI smoke test.

Posted on behalf of @schickling

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agent_tool	Codex CLI
agent_tool_version	codex-cli 0.124.0
agent_runtime	Codex CLI codex-cli 0.124.0
agent_model	unknown
worktree	effect-utils/schickling/2026-04-28-bun-followup
machine	dev3
tooling_profile	dotfiles@2edf09b-dirty

[github-actions]

Storybook Previews

Package	Latest URL	Last Deploy (Europe/Berlin)
effect-schema-form-aria	https://effect-schema-form-aria-pr-635--overeng-utils.netlify.app	2026-04-28 12:32 CEST
genie	https://genie-pr-635--overeng-utils.netlify.app	2026-04-28 12:32 CEST
notion-react	https://notion-react-pr-635--overeng-utils.netlify.app	2026-04-28 12:32 CEST
react-inspector	https://react-inspector-pr-635--overeng-utils.netlify.app	2026-04-28 12:32 CEST
tui-react	https://tui-react-pr-635--overeng-utils.netlify.app	2026-04-28 12:32 CEST
notion-cli	https://notion-cli-pr-635--overeng-utils.netlify.app	2026-04-28 12:32 CEST
tui-stories	https://tui-stories-pr-635--overeng-utils.netlify.app	2026-04-28 12:32 CEST
effect-react	https://effect-react-pr-635--overeng-utils.netlify.app	2026-04-28 12:32 CEST
megarepo	https://megarepo-pr-635--overeng-utils.netlify.app	2026-04-28 12:33 CEST

Per-Commit Deploy History

Commit 15eeb27 · 2026-04-28 12:33 CEST

Package	URL
effect-schema-form-aria	https://69f08cafa568a940d9b6a3aa--overeng-utils.netlify.app Alias: https://effect-schema-form-aria-pr-635--overeng-utils.netlify.app
genie	https://69f08cb58a2a2a269ef8ade7--overeng-utils.netlify.app Alias: https://genie-pr-635--overeng-utils.netlify.app
notion-react	https://69f08cba3e2cb33ec91e2b6f--overeng-utils.netlify.app Alias: https://notion-react-pr-635--overeng-utils.netlify.app
react-inspector	https://69f08cbeefc42b3ded6bdaff--overeng-utils.netlify.app Alias: https://react-inspector-pr-635--overeng-utils.netlify.app
tui-react	https://69f08cc56fb7a72343c77040--overeng-utils.netlify.app Alias: https://tui-react-pr-635--overeng-utils.netlify.app
notion-cli	https://69f08ccb8e7d063b8672ca07--overeng-utils.netlify.app Alias: https://notion-cli-pr-635--overeng-utils.netlify.app
tui-stories	https://69f08cd2c1b6db24a0bc9798--overeng-utils.netlify.app Alias: https://tui-stories-pr-635--overeng-utils.netlify.app
effect-react	https://69f08cd63170e23a48c70e35--overeng-utils.netlify.app Alias: https://effect-react-pr-635--overeng-utils.netlify.app
megarepo	https://69f08cde66cedd3d27ed2f85--overeng-utils.netlify.app Alias: https://megarepo-pr-635--overeng-utils.netlify.app

Commit 54ad71a · 2026-04-28 12:08 CEST

Package	URL
effect-schema-form-aria	https://69f086c42ffe342aab0d0f3b--overeng-utils.netlify.app Alias: https://effect-schema-form-aria-pr-635--overeng-utils.netlify.app
genie	https://69f086caf2c2e73595d7f9e1--overeng-utils.netlify.app Alias: https://genie-pr-635--overeng-utils.netlify.app
notion-react	https://69f086d63e2cb329a91e2cad--overeng-utils.netlify.app Alias: https://notion-react-pr-635--overeng-utils.netlify.app
react-inspector	https://69f086e3a568a9311eb6a3e8--overeng-utils.netlify.app Alias: https://react-inspector-pr-635--overeng-utils.netlify.app
tui-react	https://69f086de5cdefd01c7fa3738--overeng-utils.netlify.app Alias: https://tui-react-pr-635--overeng-utils.netlify.app
notion-cli	https://69f086d18e7d06251972c949--overeng-utils.netlify.app Alias: https://notion-cli-pr-635--overeng-utils.netlify.app
tui-stories	https://69f086dd0d9e9d09e27c4ed2--overeng-utils.netlify.app Alias: https://tui-stories-pr-635--overeng-utils.netlify.app
effect-react	https://69f086bed1f72d0cb58384c8--overeng-utils.netlify.app Alias: https://effect-react-pr-635--overeng-utils.netlify.app
megarepo	https://69f086ebe361c828cfca3731--overeng-utils.netlify.app Alias: https://megarepo-pr-635--overeng-utils.netlify.app

[schickling-assistant]

Holding this PR until nixpkgs ships a stable Bun with the module-loader fix from oven-sh/bun#29393 (Bun >= 1.3.14).

Current state:

• The upstream Bun bug is fixed, but our pinned nixpkgs still provides Bun 1.3.11.
• This PR currently carries a temporary overlay to 1.3.14-canary.1+ca9e0896c.
• Before merging, we should wait for nixpkgs to carry the fixed stable Bun, then drop nix/bun-overlay.nix and the overlay wiring/TODOs in flake.nix and devenv.nix.

Unblock checklist:

1. Confirm pkgs.bun.version >= 1.3.14 from nixpkgs.
2. Remove the temporary Bun overlay and wiring.
3. Re-run nix eval --raw .#bun.version, nix build .#bun, and nix build .#tui-stories.

Posted on behalf of @schickling

field	value
agent_name	🪵 co2-birch
agent_session_id	534da0da-7e1f-45fc-b9a8-fdcb9bbc6f0d
agent_tool	Codex CLI
agent_tool_version	codex-cli 0.124.0
agent_runtime	Codex CLI codex-cli 0.124.0
agent_model	unknown
worktree	effect-utils/schickling/2026-04-28-bun-followup
machine	dev3
tooling_profile	dotfiles@2edf09b-dirty