From a46b72ec8e7601319d0fefc8708383dff0616b34 Mon Sep 17 00:00:00 2001
From: Vladimir Babin <vovababin@gmail.com>
Date: Fri, 18 Sep 2026 10:27:18 +0300
Subject: [PATCH 1/2] fix(bun): Respect caller-supplied `runtime` option

`@sentry/bun`'s `init` unconditionally overwrote `runtime` with a hard-coded
Bun value, so SDKs wrapping it (`@sentry/elysia` on Node) reported
`{ name: 'bun', version: 'unknown' }`. Only default the runtime when the
caller did not provide one, matching `NodeClient`.

Closes #24047
---
 packages/bun/src/sdk.ts          |  2 +-
 packages/bun/src/types.ts        |  8 ++++++++
 packages/bun/test/init.test.ts   | 14 ++++++++++++++
 packages/elysia/test/sdk.test.ts | 12 ++++++++++++
 4 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/packages/bun/src/sdk.ts b/packages/bun/src/sdk.ts
index ba77f87ef9a9..2884cd542851 100644
--- a/packages/bun/src/sdk.ts
+++ b/packages/bun/src/sdk.ts
@@ -145,7 +145,7 @@ function _init(
   const options = {
     ...userOptions,
     platform: 'javascript',
-    runtime: { name: 'bun', version: typeof Bun !== 'undefined' ? Bun.version : 'unknown' },
+    runtime: userOptions.runtime || { name: 'bun', version: typeof Bun !== 'undefined' ? Bun.version : 'unknown' },
     serverName: userOptions.serverName || global.process.env.SENTRY_NAME || os.hostname(),
   };
 
diff --git a/packages/bun/src/types.ts b/packages/bun/src/types.ts
index 34643a995ab1..ade64f83137f 100644
--- a/packages/bun/src/types.ts
+++ b/packages/bun/src/types.ts
@@ -21,6 +21,14 @@ export interface BaseBunOptions extends ServerRuntimeOptions {
    * @default false
    */
   enableOpenTelemetrySetup?: boolean;
+
+  /**
+   * Override the runtime name reported in events.
+   * Defaults to 'bun' with the current Bun version if not specified.
+   *
+   * @hidden This is primarily used internally to support SDKs wrapping the Bun SDK, like Elysia.
+   */
+  runtime?: { name: string; version?: string };
 }
 
 /**
diff --git a/packages/bun/test/init.test.ts b/packages/bun/test/init.test.ts
index abf3aabf060e..2fced80fd67a 100644
--- a/packages/bun/test/init.test.ts
+++ b/packages/bun/test/init.test.ts
@@ -129,6 +129,20 @@ describe('init()', () => {
     });
   });
 
+  describe('runtime', () => {
+    it('defaults to bun', () => {
+      init({ dsn: PUBLIC_DSN, traceLifecycle: 'static' });
+
+      expect(getClient()?.getOptions().runtime).toEqual({ name: 'bun', version: Bun.version });
+    });
+
+    it('respects a runtime provided through options', () => {
+      init({ dsn: PUBLIC_DSN, traceLifecycle: 'static', runtime: { name: 'node', version: '20.0.0' } });
+
+      expect(getClient()?.getOptions().runtime).toEqual({ name: 'node', version: '20.0.0' });
+    });
+  });
+
   describe('initWithoutDefaultIntegrations()', () => {
     it('installs no default integrations', () => {
       initWithoutDefaultIntegrations({ dsn: PUBLIC_DSN, traceLifecycle: 'static' });
diff --git a/packages/elysia/test/sdk.test.ts b/packages/elysia/test/sdk.test.ts
index d27011f0e416..dab3dd8f3575 100644
--- a/packages/elysia/test/sdk.test.ts
+++ b/packages/elysia/test/sdk.test.ts
@@ -108,6 +108,18 @@ describe('init', () => {
     expect(calledOptions.runtime.name).toBe('node');
     expect(calledOptions.runtime.version).toBe(process.version);
   });
+
+  it('detects bun runtime when Bun is defined', () => {
+    vi.stubGlobal('Bun', { version: '1.2.3' });
+
+    init({ dsn: 'https://***@o0.ingest.sentry.io/0' });
+
+    const calledOptions = mockInitNode.mock.calls[0]![0];
+    expect(calledOptions.runtime).toEqual({ name: 'bun', version: '1.2.3' });
+    expect(mockApplySdkMetadata).toHaveBeenCalledWith(expect.anything(), 'elysia', ['elysia', 'bun']);
+
+    vi.unstubAllGlobals();
+  });
 });
 
 describe('getDefaultIntegrations', () => {

From d4b65207fe72eac6495ebf1fe5c63a8bced7bb9d Mon Sep 17 00:00:00 2001
From: Vladimir Babin <vovababin@gmail.com>
Date: Fri, 18 Sep 2026 13:32:16 +0300
Subject: [PATCH 2/2] test(elysia): move vi.unstubAllGlobals to afterEach

Per review feedback: unstubbing inline at the end of the test means it is
skipped if an assertion above it fails, leaking the stubbed `Bun` global
into later tests. Move it into the existing `afterEach` so cleanup always
runs.
---
 packages/elysia/test/sdk.test.ts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/packages/elysia/test/sdk.test.ts b/packages/elysia/test/sdk.test.ts
index dab3dd8f3575..142c3f4ff456 100644
--- a/packages/elysia/test/sdk.test.ts
+++ b/packages/elysia/test/sdk.test.ts
@@ -29,6 +29,7 @@ const { init, getDefaultIntegrations } = await import('../src/sdk');
 describe('init', () => {
   afterEach(() => {
     vi.clearAllMocks();
+    vi.unstubAllGlobals();
   });
 
   it('sets SDK metadata to elysia', () => {
@@ -117,8 +118,6 @@ describe('init', () => {
     const calledOptions = mockInitNode.mock.calls[0]![0];
     expect(calledOptions.runtime).toEqual({ name: 'bun', version: '1.2.3' });
     expect(mockApplySdkMetadata).toHaveBeenCalledWith(expect.anything(), 'elysia', ['elysia', 'bun']);
-
-    vi.unstubAllGlobals();
   });
 });