fix(elysia): avoid AsyncLocalStorage probe on Bun

.changeset/safe-context-probe.md

@@ -0,0 +1,5 @@
+---
+"evlog": patch
+---
+
+Prevent the Elysia integration from stalling `bun:test` lifecycle hooks by avoiding the side-effecting `AsyncLocalStorage.enterWith()` capability probe on Bun.

packages/evlog/src/shared/asyncStorageScope.ts

@@ -19,12 +19,15 @@ export interface AsyncLocalStorageLike<T> {
  * Whether this runtime provides a working native `AsyncLocalStorage.enterWith()`.
  *
  * Cloudflare Workers expose `enterWith` on the prototype but throw when it is
- * called, so a `typeof` check alone is not enough — we probe with a call.
+ * called, so a `typeof` check alone is not enough. Bun implements it natively,
+ * but probing changes `bun:test`'s active async context, so Bun is detected
+ * without invoking the method.
  */
 export function supportsAsyncLocalStorageEnterWith(
   storage: { enterWith?: unknown },
 ): boolean {
   if (typeof storage.enterWith !== 'function') return false
+  if ('Bun' in globalThis) return true
   try {
     // Must call as a method — unbound enterWith loses `this` and throws on Node.
     const probe = storage as { enterWith: (store: undefined) => void }

packages/evlog/test/shared/asyncStorageScope.test.ts

@@ -1,5 +1,5 @@
 import { AsyncLocalStorage } from 'node:async_hooks'
-import { beforeEach, describe, expect, it } from 'vitest'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { Elysia } from 'elysia'
 import { initLogger } from '../../src/logger'
 import {
@@ -52,6 +52,18 @@ async function request(app: { handle: (req: Request) => Promise<Response> }, pat
 }
 
 describe('asyncStorageScope', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals()
+  })
+
+  it('does not probe enterWith on Bun (#496)', () => {
+    vi.stubGlobal('Bun', {})
+    const enterWith = vi.fn()
+
+    expect(supportsAsyncLocalStorageEnterWith({ enterWith })).toBe(true)
+    expect(enterWith).not.toHaveBeenCalled()
+  })
+
   it('detects native enterWith support', () => {
     expect(supportsAsyncLocalStorageEnterWith(new AsyncLocalStorage<string>())).toBe(true)
   })