`sideEffects: false` + catch-all `onResolve` plugin causes live bindings to be tree-shaken from namespace exports

[stefanprobst]

What version of Bun is running?

1.3.12

What platform is your computer?

linux

What steps can reproduce the bug?

see https://github.com/stefanprobst/issue-bun-namespace-sideeffects/blob/main/readme.md

in reproduction repro:

• bun build.ts # builds without errors
• bun src/index.ts # works correctly
• bun dist/index.js # ReferenceError: foo is not defined

What is the expected behavior?

No response

What do you see instead?

No response

Additional information

x-ref bunup/bunup#119

[github-actions]

Found 2 possible duplicate issues:

1. Bun build does not import values re-exported from another package when sideEffects is false #18008
2. sideEffects field breaks bundler tree-shaking in Bun 1.3.10 #27709

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[stefanprobst]

related to #27709 but not a duplicate - sideEffects: false alone doesn't reproduce this; the broad onResolve plugin filter is required as a second condition.