fix(bun): Respect caller-supplied runtime option

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(),
   };
 

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 };
 }
 
 /**

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' });

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', () => {
@@ -108,6 +109,16 @@ 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']);
+  });
 });
 
 describe('getDefaultIntegrations', () => {