[0xPlayerOne]

Summary

Moves every Bun pin in this repository from 1.4.0 to 1.4.3: .mise.toml, packageManager, the bun-version of the four workflows that set it (design-system-gates, publish-ui, registry-pages, vite-task-cache-proof) and the PROOF_TOOLCHAIN label in packages/ui/scripts/vite-task-cache-proof.ts. bun.lock carries the workspace version refresh that Bun 1.4.3 writes (0.139.0 to 0.141.0).

The same branch carries the Solid test transform, so main never has a head where Bun 1.4.3 cannot link .tsx test imports. Bun 1.4.3 compiles jsx: preserve with jsxImportSource: solid-js as automatic dev JSX, and solid-js/jsx-dev-runtime exports no jsxDEV (696 pass, 12 fail, 12 errors instead of 872 pass without the transform). packages/ui/tests/helpers/solid-transform.ts is a Bun.plugin preload that runs the build's babel-preset-solid transform, modelled on Cortana's. It is passed with --preload by the packages/ui test script and by the root coverage command (package.json, vite.config.ts). The root bunfig.toml has no preload, so root bun test in Design System Gates' Gate scope still runs the dependency-free workflow tests without importing Babel before install.

The transform uses transformSync: Babel sets Error.prepareStackTrace and raises Error.stackTraceLimit before transformAsync returns its promise, so overlapping onLoad callbacks saved each other's changed values and restored them last, and Bun's Error.captureStackTrace({}) (and a vite import) then threw. tests/solid-transform-globals.test.ts runs a cold process that imports four .tsx modules at once, then calls Error.captureStackTrace({}), then imports vite. It failed 3 of 3 runs against the transformAsync version and passes now.

New devDependencies of packages/ui (Cortana's ranges): @babel/core ^8.0.6, @babel/preset-typescript ^8.0.1, babel-preset-solid ^1.9.15; all lock entries are registry sha512.

Validation

• Bun 1.4.3 and 1.4.0: packages/ui tests 872 pass, 0 fail; root coverage run (--preload form) 872 pass, exit 0; Storybook unit tests 15 pass; oxfmt --check, oxlint --deny-warnings and tsc -p tsconfig.check.json clean; frozen install passes.
• Gate scope on a clean Bun 1.4.3 checkout with no node_modules: the four workflow test files, run exactly as the workflow does, give 24 pass, 0 fail, and no node_modules appears. At the earlier head (5cdb0ce, global preload) the same command gave 0 pass, 4 fail with Cannot find module '@babel/core' from packages/ui/tests/helpers/solid-transform.ts. That clean clone has a root package.json, so Bun's auto-install does not apply there; I did not test a runner without one.
• Hosted CI: none yet (draft).

Impact and rollout

• No migration or rollout action is required
• Migration or rollout steps are documented below
• Environment or secret changes are documented below
• Security, privacy, compatibility, or performance impact is documented below
• Rollback or follow-up work is documented below

Compatibility: test-only transform; no source, build or published output changes. Coverage totals shift slightly because Babel output replaces Bun's JSX output; the run still exits 0. 21 of 135 src/**/*.tsx modules cannot be imported in the DOM-less unit lane (window is not defined), as before; no unit test imports them.

Review notes

First of a two-PR stack: this PR, then bun check typechecking (#456, based on this branch). #455 (claude/ui-solid-test-transform) was the separate transform PR; its branch now points at the same commit as this one and it is folded in here. Draft, auto-merge off.

Related issue

None.

---

Generated by Claude Code

[0xPlayerOne]

Personal source outcome: APPROVED at 5872098; merge PENDING qualification. I personally reviewed the complete combined 19-file patch, including the complete lockfile delta, original pins/transform scope and repair regression. Pins and the Solid transform now land atomically. Root workflow tests no longer import Babel through global bunfig; package and both coverage commands explicitly preload. transformSync plus finally prevents overlapping async callbacks from restoring Babel's global stack wrapper, and the cold-process regression checks concurrent TSX imports, both Error globals, captureStackTrace({}) and Vite import. Babel7 remains nested for existing build tooling; no production component implementation changed. Gate scope and cache proof have passed; remaining applicable CI/protections are pending. Owner-reported local tests are not tests I executed. This author-account comment is not a formal GitHub approval. Auto-merge remains off.