Add node:fs implementation on Sandbox#112
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LukeSheard merged 7 commits intomainfrom Apr 13, 2026
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LukeSheard
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node:fs implementation on Sandbox
The SWC compiler plugin in workflow@4.2.0-beta.73 had a bug where
anonymous class expressions (var Foo = class { ... }) without an
internal class name would fall back to 'AnonymousClass' for step
registrations, causing a ReferenceError at runtime.
This was fixed in vercel/workflow2@5d22e614 and released in 4.2.1.
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Review the following changes in direct dependencies. Learn more about Socket for GitHub.
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QuiiBz
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Apr 13, 2026
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Schniz
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Apr 14, 2026
This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## @vercel/sandbox@1.10.0 ### Minor Changes - Expose Filesystem api from Sandbox ([#112](#112)) ### Patch Changes - Reuse Undici `Agent` across instances ([#143](#143)) - Smarter fallback team selection for scope inference: tries `defaultTeamId` first, then the best hobby-plan OWNER team (personal team or most recently updated). Filters fallback candidates by `billing.plan === 'hobby'` to avoid selecting pro/enterprise teams. Skips teams that return 403 and shows a helpful error when no team allows sandbox creation. ([#120](#120)) - Add workflow serialization support for the `Snapshot` class via `WORKFLOW_SERIALIZE` / `WORKFLOW_DESERIALIZE`, fixing serialization errors when a `Snapshot` instance is returned from a workflow step. ([#140](#140)) ## sandbox@2.5.10 ### Patch Changes - Smarter fallback team selection for scope inference: tries `defaultTeamId` first, then the best hobby-plan OWNER team (personal team or most recently updated). Filters fallback candidates by `billing.plan === 'hobby'` to avoid selecting pro/enterprise teams. Skips teams that return 403 and shows a helpful error when no team allows sandbox creation. ([#120](#120)) - Updated dependencies \[[`9dc0ac96d1d531b5a44786c92d6ddc2ce4890791`](9dc0ac9), [`494c2ddae5899b7f793cbd906a2a62260bd08885`](494c2dd), [`3fbabb95946771e41d8b17b7f8cb8d2972beba25`](3fbabb9), [`42515e1ede4468fad204e5332ade0ee5d8dce3e5`](42515e1)]: - @vercel/sandbox@1.10.0 ## sandbox-filesystem-snapshots@0.0.15 ### Patch Changes - Updated dependencies \[[`9dc0ac96d1d531b5a44786c92d6ddc2ce4890791`](9dc0ac9), [`494c2ddae5899b7f793cbd906a2a62260bd08885`](494c2dd), [`3fbabb95946771e41d8b17b7f8cb8d2972beba25`](3fbabb9), [`42515e1ede4468fad204e5332ade0ee5d8dce3e5`](42515e1)]: - @vercel/sandbox@1.10.0 ## workflow-code-runner@0.1.4 ### Patch Changes - Updated dependencies \[[`9dc0ac96d1d531b5a44786c92d6ddc2ce4890791`](9dc0ac9), [`494c2ddae5899b7f793cbd906a2a62260bd08885`](494c2dd), [`3fbabb95946771e41d8b17b7f8cb8d2972beba25`](3fbabb9), [`42515e1ede4468fad204e5332ade0ee5d8dce3e5`](42515e1)]: - @vercel/sandbox@1.10.0 --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Gal Schlezinger <gal@spitfire.co.il>
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This PR introduces a node:fs-compatible API for the Vercel Sandbox environment.
The goal is to provide a familiar, minimal subset of Node’s filesystem interface that works within the constraints of the Sandbox runtime, enabling easier portability of existing Node.js code and libraries.
In particular provide something we can pass directly around with
just-bashas anfsimplementation without needing theirSandboxprimitive wrapper.