From f648483fe78a29906e7de67e5cb8230f1ef7c54f Mon Sep 17 00:00:00 2001
From: robobun <robobun@oven.sh>
Date: Fri, 30 Jan 2026 13:13:28 -0800
Subject: [PATCH] fix(types): add missing SIMD variants to
 Bun.Build.CompileTarget type (#26248)
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## Summary

- Adds missing SIMD variants to the `Build.Target` TypeScript type
- The runtime accepts targets like `bun-linux-x64-modern` but TypeScript
was rejecting them
- Generalized the type to use `${Architecture}` template where possible

## Test plan

- [x] Added regression test in `test/regression/issue/26247.test.ts`
that validates all valid target combinations type-check correctly
- [x] Verified with `bun bd test test/regression/issue/26247.test.ts`

Fixes #26247

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Alistair Smith <hi@alistair.sh>
---
 packages/bun-types/bun.d.ts                 |  6 +++---
 test/integration/bun-types/fixture/build.ts | 13 ++++++++++++-
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/packages/bun-types/bun.d.ts b/packages/bun-types/bun.d.ts
index 4621e9854e..f8b6991e48 100644
--- a/packages/bun-types/bun.d.ts
+++ b/packages/bun-types/bun.d.ts
@@ -2433,11 +2433,11 @@ declare module "bun" {
     type SIMD = "baseline" | "modern";
     type CompileTarget =
       | `bun-darwin-${Architecture}`
-      | `bun-darwin-x64-${SIMD}`
+      | `bun-darwin-${Architecture}-${SIMD}`
       | `bun-linux-${Architecture}`
       | `bun-linux-${Architecture}-${Libc}`
-      | `bun-linux-x64-${SIMD}`
-      | `bun-linux-x64-${SIMD}-${Libc}`
+      | `bun-linux-${Architecture}-${SIMD}`
+      | `bun-linux-${Architecture}-${SIMD}-${Libc}`
       | "bun-windows-x64"
       | `bun-windows-x64-${SIMD}`;
   }
diff --git a/test/integration/bun-types/fixture/build.ts b/test/integration/bun-types/fixture/build.ts
index 7c7a7fdfdd..fd8969a5a1 100644
--- a/test/integration/bun-types/fixture/build.ts
+++ b/test/integration/bun-types/fixture/build.ts
@@ -1,10 +1,21 @@
-import { expectType } from "./utilities";
+import { expectAssignable, expectType } from "./utilities";
 
 Bun.build({
   entrypoints: ["hey"],
   splitting: false,
 });
 
+// Build.CompileTarget should accept SIMD variants (issue #26247)
+expectAssignable<Bun.Build.CompileTarget>("bun-linux-x64-modern");
+expectAssignable<Bun.Build.CompileTarget>("bun-linux-x64-baseline");
+expectAssignable<Bun.Build.CompileTarget>("bun-linux-arm64-modern");
+expectAssignable<Bun.Build.CompileTarget>("bun-linux-arm64-baseline");
+expectAssignable<Bun.Build.CompileTarget>("bun-linux-x64-modern-glibc");
+expectAssignable<Bun.Build.CompileTarget>("bun-linux-x64-modern-musl");
+expectAssignable<Bun.Build.CompileTarget>("bun-darwin-x64-modern");
+expectAssignable<Bun.Build.CompileTarget>("bun-darwin-arm64-baseline");
+expectAssignable<Bun.Build.CompileTarget>("bun-windows-x64-modern");
+
 Bun.build({
   entrypoints: ["hey"],
   splitting: false,