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chore: Make @sentry/conventions sideEffect free during bundling - #22015
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JPeer264 added a commit
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Sep 2, 2026
…false` externals (#23674) For CF integration tests there were a lot of warnings printed: ``` ▲ [WARNING] Ignoring this import because ".../packages/core/build/esm/index.js" was marked as having no side effects [ignored-bare-import] packages/cloudflare/build/esm/prod/sdk.js:3:7: 3 │ import '@sentry/core'; ``` ### Root cause `treeshake.moduleSideEffects` in `dev-packages/rollup-utils/npmHelpers.mjs` told Rollup that every external module has side effects. When Rollup tree-shakes away all named bindings of such an external, it keeps a bare side-effect import to preserve those effects. That import contradicts the dependency's own `"sideEffects": false`, which is what the consuming bundler reports. The Cloudflare instance is reachable from a single line in `packages/cloudflare/src/sdk.ts`: ```ts export { _clearGlobalClientCache } from './clientCache'; ``` _clearGlobalClientCache is a test-only helper that no entrypoint reaches, so Rollup drops the re-export. clientCache.ts imports GLOBAL_OBJ from @sentry/core, and Rollup hoists that external dependency into sdk.js as a bare import to keep its supposed side effects alive. #22015 already hit this and special-cased @sentry/conventions. That patched one instance rather than the mechanism, so the next package to trip it, @sentry/core, brought the warnings straight back. ### Solution Now we check for the key `sideEffects` in the respesctitive `package.json`. If there is `sideEffects` set it will take its value, and if there is non then we assume there are side effects, just as before. With that the warnings are gone. Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
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@sentry/conventionsare marked withsideEffects. That leads to having@sentry/conventions/attributesas side effect import in the bundled output:By telling rollup that
@sentry/conventionsis side effect free, the side effect import from the output is being removed (it also reflects thepackage.json#sideEffectfieldOriginally I came to this fix as the Cloudflare integration tests were quite verbose in this warning: