feat: Add Bun runtime support with pure JavaScript backend

.github/workflows/build.yml

@@ -34,6 +34,29 @@ jobs:
       - run: npm install
       - run: npm run test:js-valgrind
 
+  bun-smoke:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - triplet: linux-x64
+            runs-on: ubuntu-latest
+          - triplet: linux-arm64
+            runs-on: ubuntu-24.04-arm
+          - triplet: darwin-arm64
+            runs-on: macos-14
+    runs-on: ${{ matrix.runs-on }}
+    name: bun-smoke-${{ matrix.triplet }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 24
+      - uses: oven-sh/setup-bun@v2
+      - run: npm install
+      - run: npm run bun:smoke
+      - run: npm run bun:smoke:pack
+
   build:
     uses: Datadog/action-prebuildify/.github/workflows/build.yml@main
     with:
@@ -44,7 +67,7 @@ jobs:
       skip: 'linux-arm,linux-ia32' # skip building for these platforms
 
   dev_publish:
-    needs: build
+    needs: [build, bun-smoke]
     runs-on: ubuntu-latest
     if: github.ref == 'refs/heads/main'
     environment: npm
@@ -66,7 +89,7 @@ jobs:
 
   build-successful:
     if: always()
-    needs: [build]
+    needs: [build, bun-smoke]
     runs-on: ubuntu-latest
     steps:
     - name: Determine if everything is passing

.github/workflows/release.yml

@@ -15,8 +15,31 @@ jobs:
       min-node-version: 18
       skip: 'linux-arm,linux-ia32' # skip building for these platforms
 
+  bun-smoke:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - triplet: linux-x64
+            runs-on: ubuntu-latest
+          - triplet: linux-arm64
+            runs-on: ubuntu-24.04-arm
+          - triplet: darwin-arm64
+            runs-on: macos-14
+    runs-on: ${{ matrix.runs-on }}
+    name: bun-smoke-${{ matrix.triplet }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 24
+      - uses: oven-sh/setup-bun@v2
+      - run: npm install
+      - run: npm run bun:smoke
+      - run: npm run bun:smoke:pack
+
   publish:
-    needs: build
+    needs: [build, bun-smoke]
     runs-on: ubuntu-latest
     environment: npm
     permissions:

.gitignore

@@ -3,7 +3,9 @@
 .vscode
 /*.build
 /build
-out
+out/*
+!out/src/
+!out/src/**
 node_modules
 system-test/busybench/package-lock.json
 system-test/busybench-js/package-lock.json

out/src/bun-native-backend.d.ts

@@ -0,0 +1,40 @@
+/**
+ * Copyright 2026 Datadog
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ */
+import { AllocationProfileNode, TimeProfile, TimeProfilerMetrics } from './v8-types';
+export declare class BunTimeProfiler {
+    metrics: TimeProfilerMetrics;
+    state: {
+        [key: string]: number;
+    };
+    private readonly withContexts;
+    private readonly intervalMicros;
+    private readonly collectCpuTime;
+    private started;
+    private startTime;
+    private contextTimeline;
+    private currentContext;
+    private currentContextSignature;
+    private lastRecordedContextSignature;
+    private lastContextCpuUsage;
+    constructor(...args: unknown[]);
+    get context(): object | undefined;
+    set context(context: object | undefined);
+    private recordContext;
+    private normalizedContextTimeline;
+    start(): void;
+    stop(restart: boolean): TimeProfile;
+    dispose(): void;
+    v8ProfilerStuckEventLoopDetected(): number;
+}
+export declare function bunGetNativeThreadId(): number;
+export declare function bunStartSamplingHeapProfiler(): void;
+export declare function bunStopSamplingHeapProfiler(): void;
+export declare function bunGetAllocationProfile(): AllocationProfileNode;
+export declare function bunMonitorOutOfMemory(_heapLimitExtensionSize: number, _maxHeapLimitExtensionCount: number, _dumpHeapProfileOnSdterr: boolean, _exportCommand: Array<String> | undefined, _callback: unknown, _callbackMode: number, _isMainThread: boolean): void;