[Phototonic]

Summary

On Bun 1.3.14, the first Bun.build in tests/plugin-bundle-boundary.test.ts fails to resolve existing relative imports such as ../services/logger.js. The following identical build succeeds; selecting the SDK test alone makes that test fail instead. Identical standalone API and CLI builds pass on the same generated files and dependencies.

This matches Bun's test-runner resolver-cache issue, with the directory-cache behavior described in oven-sh/bun#36245. Isolate bundle construction in a fresh process using the current Bun executable, a repository-root working directory, and the same --target=bun --packages=bundle settings.

The change is confined to the test file. Every existing transformer, SDK/OIDC, and bundled provider-loader assertion is retained, and build failures include stderr diagnostics. This preserves the bootstrap guards established by #82 and #165 without changing runtime imports, dependencies, or Bun versions.

Test plan

• Exercised the change locally (or N/A for docs/meta-only)
• Noted any follow-up or known limitations

Validated on Linux with Bun 1.3.14, based on upstream 83c386bc6b048220a2e7d9309733e1acd6c608cb:

• Before: bun test tests/plugin-bundle-boundary.test.ts → 2 passed, 1 failed, with the unresolved-import errors above.
• After: the same command → 3 passed, 0 failed, including runtime loading of the bundled lazy provider.
• Negative checks against temporary generated-output mutations: a missing import fails with the build diagnostic; eager SDK and transformer imports each fail their existing bundle-content assertion. Restored the generated output and reran the normal tests successfully.
• bun run build, bun run typecheck, and bun run check → passed.
• Full post-build bun test → 949 passed, 4 skipped, 0 failed across 131 files.
• git diff --check → passed.

Windows and macOS have not been validated locally. No README update is needed for this internal test-isolation change.

Checklist

• Branch is based on main (do not open PRs from commits already on main)
• bun test passes (or N/A)
• bun run typecheck passes (or N/A)
• bun run check passes (format + lint + typecheck; or N/A)
• Docs / README updated when behavior or contribution process changes