Bun

Active advisories

1. minorInvestigating

   Bun 1.4.4 bun fmt --doctor Incorrectly Flags Required Prettier Plugins

   In Bun v1.4.4, running `bun fmt --doctor` incorrectly instructs users to remove a Prettier plugin that is still required and loaded by a script in `.prettierrc`. Developers using Bun's formatting diagnostics alongside custom Prettier configurations are affected.

   Bun

   Nov 7, 02:59 UTC·12 hours agov1.4.4

   Velocity

   4.7

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2. mediumInvestigating

   Bun Transpiler Incorrectly Rewrites `return undefined` in Async Generators

   In Bun 1.4.4, the transpiler simplifies `return undefined;` and `return void 0;` to `return;` inside async generator bodies, skipping the required microtask tick. This affects `bun run`, `Bun.Transpiler`, and `bun build`, altering promise resolution order.

   Bun

   Nov 7, 02:37 UTC·12 hours agov1.4.4

   Velocity

   4.6

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3. mediumInvestigating

   Bun Isolated Linker Duplicates Expo Modules When expo-router Added

   An issue in Bun 1.4.4-canary.1+6bb5dc195 on Windows x64 causes the isolated linker to duplicate Expo modules when expo-router is added after a specific fix. Developers working with workspaces and Expo are affected.

   Bun

   Oct 20, 15:25 UTC·18 days agov1.4.4-canary.1+6bb5dc195

   Velocity

   0.1

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Version hazard notices

• Use with caution:Bun 1.4.42 active medium-severity incidents
  • mediumInvestigatingBun Transpiler Incorrectly Rewrites `return undefined` in Async Generators
  • minorInvestigatingBun 1.4.4 bun fmt --doctor Incorrectly Flags Required Prettier Plugins
• Use with caution:Bun 1.4.4-canary.1+6bb5dc1951 active medium-severity incident
  • mediumInvestigatingBun Isolated Linker Duplicates Expo Modules When expo-router Added

Resolved incident history

No resolved incidents on record yet.