javascriptbabel/babel #17463Not a task: not reproduced

`sideEffects: false` to `@babel/runtime`'s package.json

envgap__babel__babel-17463

Original GitHub issue ↗Dated source checkout ↗Opened 2025-08-01

01 / FAILURE SIGNATURE

As reported upstream

No identifying execution failure has been captured.

Not a benchmark task.

In a clean container the reported failure did not reproduce, or the known fix did not make the project run.

02 / ENVIRONMENT RECIPE

Base commit: f4313a45155b5844ada61d4e243b6ee989a8abca
Manifest: packages/babel-runtime-corejs3/package.json
Reproduce: Awaiting issue-specific recipe
Run under trace: Awaiting a meaningful runtime command

03 / ORIGINAL ISSUE TEXT

babel/babel #17463 · read the original issue

### 💻

- [x] Would you like to work on this feature?

### What problem are you trying to solve?

Hello! :)

Would it make sense to add `sideEffects: false` to the `package.json` of `@babel/runtime`? This can enable more tree-shaking, in some cases: [documentation](https://github.com/webpack/webpack/blob/main/examples/side-effects/README.md) ([more detailed documentation](https://github.com/webpack/webpack.js.org/blob/6bc07960d30b7c534d809de86f1d611e9973af37/src/content/guides/tree-shaking.mdx))

If so, I'd be happy to open a PR :)

### Describe the solution you'd like

Adding the flag

### Describe alternatives you've considered

N/A

### Documentation, Adoption, Migration Strategy

_No response_

Continue on GitHub ↗

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