From 61845426829ccbea072a417df45dd8b3d5d822d3 Mon Sep 17 00:00:00 2001
From: Jarred Sumner <jarred@jarredsumner.com>
Date: Wed, 21 Feb 2024 14:13:43 -0800
Subject: [PATCH] Add `BUN_DEBUG` flag to control where debug logs go (#9019)

* Add `BUN_DEBUG` flag to control where debug logs go

* Update all the actions

* Configure temp

* use spawn instead of rm

* Use CLOSE_RANGE_CLOEXEC

* Make some tests more reproducible

* Update hot.test.ts

* Detect file descriptor leaks and wait for stdout

* Update runner.node.mjs

* Update preload.ts

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
---
 .github/workflows/bun-linux-aarch64.yml       |  12 +-
 .github/workflows/bun-linux-build.yml         |  19 +-
 .github/workflows/bun-mac-aarch64.yml         |  31 +-
 .github/workflows/bun-mac-x64-baseline.yml    |  33 +-
 .github/workflows/bun-mac-x64.yml             |  33 +-
 .github/workflows/bun-release.yml             |  18 +-
 .github/workflows/bun-types-tests.yml         |   2 +-
 .github/workflows/bun-windows.yml             |  37 +-
 bunfig.toml                                   |   1 +
 docs/cli/install.md                           |   2 +-
 docs/guides/runtime/cicd.md                   |   2 +-
 .../bun-internal-test/src/runner.node.mjs     | 116 ++++-
 packages/bun-uws/.github/workflows/codeql.yml |   2 +-
 packages/bun-uws/.github/workflows/cpp.yml    |   2 +-
 src/bun.js/bindings/bun-spawn.cpp             |  17 +-
 src/bun.js/bindings/c-bindings.cpp            |   2 +-
 src/output.zig                                |  54 ++-
 test/cli/hot/hot.test.ts                      | 443 ++++++++++--------
 test/js/node/watch/fs.watchFile.test.ts       |   2 +-
 test/preload.ts                               |  10 +
 20 files changed, 521 insertions(+), 317 deletions(-)
 create mode 100644 test/preload.ts

diff --git a/.github/workflows/bun-linux-aarch64.yml b/.github/workflows/bun-linux-aarch64.yml
index 292f58e02c..3ba8f9dab9 100644
--- a/.github/workflows/bun-linux-aarch64.yml
+++ b/.github/workflows/bun-linux-aarch64.yml
@@ -51,14 +51,14 @@ jobs:
             runner: linux-arm64
             build_machine_arch: aarch64
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: false
           ref: ${{github.sha}}
           clean: true
       - run: |
           bash ./scripts/update-submodules.sh
-      - uses: docker/setup-buildx-action@v2
+      - uses: docker/setup-buildx-action@v3
         id: buildx
         with:
           install: true
@@ -66,7 +66,7 @@ jobs:
         run: |
           rm -rf ${{runner.temp}}/release
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -74,7 +74,7 @@ jobs:
       - run: |
           mkdir -p /tmp/.buildx-cache-${{matrix.tag}}
       - name: Build and push
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: false
@@ -113,11 +113,11 @@ jobs:
 
           zip -r bun-${{matrix.tag}}-profile.zip bun-${{matrix.tag}}-profile
           zip -r bun-${{matrix.tag}}.zip bun-${{matrix.tag}}
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: bun-${{matrix.tag}}-profile
           path: ${{runner.temp}}/release/bun-${{matrix.tag}}-profile.zip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: bun-${{matrix.tag}}
           path: ${{runner.temp}}/release/bun-${{matrix.tag}}.zip
diff --git a/.github/workflows/bun-linux-build.yml b/.github/workflows/bun-linux-build.yml
index bee8cee6ac..6e8543902c 100644
--- a/.github/workflows/bun-linux-build.yml
+++ b/.github/workflows/bun-linux-build.yml
@@ -86,7 +86,7 @@ jobs:
           submodules: recursive
           ref: ${{github.sha}}
           clean: true
-      - uses: docker/setup-buildx-action@v2
+      - uses: docker/setup-buildx-action@v3
         id: buildx
         with:
           install: true
@@ -94,7 +94,7 @@ jobs:
         run: |
           rm -rf ${{runner.temp}}/release
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -102,7 +102,7 @@ jobs:
       - run: |
           mkdir -p /tmp/.buildx-cache-${{matrix.tag}}
       - name: Build and push
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: false
@@ -154,19 +154,19 @@ jobs:
 
           zip -r bun-${{matrix.tag}}-profile.zip bun-${{matrix.tag}}-profile
           zip -r bun-${{matrix.tag}}.zip bun-${{matrix.tag}}
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: bun-${{matrix.tag}}-profile
           path: ${{runner.temp}}/release/bun-${{matrix.tag}}-profile.zip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: bun-${{matrix.tag}}
           path: ${{runner.temp}}/release/bun-${{matrix.tag}}.zip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: bun-obj-${{matrix.tag}}
           path: ${{runner.temp}}/release/bun-obj
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{matrix.tag}}-dependencies
           path: ${{runner.temp}}/release/bun-dependencies
@@ -234,7 +234,7 @@ jobs:
           clean: true
       - id: download
         name: Download
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: bun-${{matrix.tag}}
           path: ${{runner.temp}}/release
@@ -275,6 +275,7 @@ jobs:
         name: Test (node runner)
         env:
           SMTP_SENDGRID_SENDER: ${{ secrets.SMTP_SENDGRID_SENDER }}
+          TMPDIR: ${{runner.temp}}
           TLS_MONGODB_DATABASE_URL: ${{ secrets.TLS_MONGODB_DATABASE_URL }}
           TLS_POSTGRES_DATABASE_URL: ${{ secrets.TLS_POSTGRES_DATABASE_URL }}
         # if: ${{github.event.inputs.use_bun == 'false'}}
@@ -283,7 +284,7 @@ jobs:
           ulimit -c
 
           node packages/bun-internal-test/src/runner.node.mjs || true
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: steps.test.outputs.failing_tests != ''
         with:
           name: cores
diff --git a/.github/workflows/bun-mac-aarch64.yml b/.github/workflows/bun-mac-aarch64.yml
index 8f312e4f49..bcb01918fa 100644
--- a/.github/workflows/bun-mac-aarch64.yml
+++ b/.github/workflows/bun-mac-aarch64.yml
@@ -51,20 +51,20 @@ jobs:
       #   run: git submodule update --init --recursive --depth=1 --progress --force
 
       - name: Setup Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
         id: buildx
         with:
           install: true
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Compile Zig Object
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v5
         if: runner.arch == 'X64'
         with:
           context: .
@@ -84,7 +84,7 @@ jobs:
           outputs: type=local,dest=${{runner.temp}}/release
 
       - name: Upload Zig Object
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.tag }}
           path: ${{runner.temp}}/release/bun-zig.o
@@ -141,7 +141,7 @@ jobs:
 
       - name: Cache submodule dependencies
         id: cache-deps-restore
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: ${{runner.temp}}/bun-deps
           key: bun-deps-${{ matrix.tag }}-${{ steps.submodule-versions.outputs.sha }}
@@ -159,13 +159,13 @@ jobs:
       - name: Cache submodule dependencies
         if: ${{ !steps.cache-deps-restore.outputs.cache-hit }}
         id: cache-deps-save
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         with:
           path: ${{runner.temp}}/bun-deps
           key: ${{ steps.cache-deps-restore.outputs.cache-primary-key }}
 
       - name: Upload submodule dependencies
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.tag }}-deps
           path: ${{runner.temp}}/bun-deps
@@ -235,7 +235,7 @@ jobs:
           bash compile-cpp-only.sh -v
 
       - name: Upload C++
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.tag }}-cpp
           path: ${{ runner.temp }}/bun-cpp-obj/bun-cpp-objects.a
@@ -285,19 +285,19 @@ jobs:
           echo "${{ runner.temp }}/.bun/bin" >> $GITHUB_PATH
 
       - name: Download C++
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ matrix.tag }}-cpp
           path: ${{ runner.temp }}/bun-cpp-obj
 
       - name: Download Zig Object
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ matrix.obj }}
           path: ${{ runner.temp }}/release
 
       - name: Downloaded submodule dependencies
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ matrix.tag }}-deps
           path: ${{runner.temp}}/bun-deps
@@ -330,11 +330,11 @@ jobs:
 
           zip -r ${{matrix.tag}}-profile.zip ${{matrix.tag}}-profile
           zip -r ${{matrix.tag}}.zip ${{matrix.tag}}
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{matrix.tag}}-profile
           path: ${{runner.temp}}/link-build/${{matrix.tag}}-profile.zip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{matrix.tag}}
           path: ${{runner.temp}}/link-build/${{matrix.tag}}.zip
@@ -394,12 +394,12 @@ jobs:
     steps:
       - id: checkout
         name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: false
       - id: download
         name: Download
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{matrix.tag}}
           path: ${{runner.temp}}/release
@@ -426,6 +426,7 @@ jobs:
         name: Test (node runner)
         env:
           SMTP_SENDGRID_SENDER: ${{ secrets.SMTP_SENDGRID_SENDER }}
+          TMPDIR: ${{runner.temp}}
           TLS_MONGODB_DATABASE_URL: ${{ secrets.TLS_MONGODB_DATABASE_URL }}
           TLS_POSTGRES_DATABASE_URL: ${{ secrets.TLS_POSTGRES_DATABASE_URL }}
         # if: ${{github.event.inputs.use_bun == 'false'}}
diff --git a/.github/workflows/bun-mac-x64-baseline.yml b/.github/workflows/bun-mac-x64-baseline.yml
index 3e1493f2b9..ce7518ebae 100644
--- a/.github/workflows/bun-mac-x64-baseline.yml
+++ b/.github/workflows/bun-mac-x64-baseline.yml
@@ -55,20 +55,20 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Setup Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
         id: buildx
         with:
           install: true
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Compile Zig Object
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: false
@@ -97,7 +97,7 @@ jobs:
           outputs: type=local,dest=${{runner.temp}}/release
 
       - name: Upload Zig Object
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.tag }}
           path: ${{runner.temp}}/release/bun-zig.o
@@ -146,7 +146,7 @@ jobs:
 
       - name: Cache submodule dependencies
         id: cache-deps-restore
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: ${{runner.temp}}/bun-deps
           key: bun-deps-${{ matrix.tag }}-${{ steps.submodule-versions.outputs.sha }}
@@ -164,13 +164,13 @@ jobs:
       - name: Cache submodule dependencies
         if: ${{ !steps.cache-deps-restore.outputs.cache-hit }}
         id: cache-deps-save
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         with:
           path: ${{runner.temp}}/bun-deps
           key: ${{ steps.cache-deps-restore.outputs.cache-primary-key }}
 
       - name: Upload submodule dependencies
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.tag }}-deps
           path: ${{runner.temp}}/bun-deps
@@ -240,7 +240,7 @@ jobs:
           bash compile-cpp-only.sh -v
 
       - name: Upload C++
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.tag }}-cpp
           path: ${{ runner.temp }}/bun-cpp-obj/bun-cpp-objects.a
@@ -262,7 +262,7 @@ jobs:
             runner: macos-12-large
             artifact: bun-obj-darwin-x64-baseline
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Checkout submodules
         run: git submodule update --init --recursive --depth=1 --progress --force
 
@@ -286,19 +286,19 @@ jobs:
           echo "${{ runner.temp }}/.bun/bin" >> $GITHUB_PATH
 
       - name: Download C++
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ matrix.tag }}-cpp
           path: ${{ runner.temp }}/bun-cpp-obj
 
       - name: Download Zig Object
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ matrix.obj }}
           path: ${{ runner.temp }}/release
 
       - name: Downloaded submodule dependencies
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ matrix.tag }}-deps
           path: ${{runner.temp}}/bun-deps
@@ -331,11 +331,11 @@ jobs:
 
           zip -r ${{matrix.tag}}-profile.zip ${{matrix.tag}}-profile
           zip -r ${{matrix.tag}}.zip ${{matrix.tag}}
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{matrix.tag}}-profile
           path: ${{runner.temp}}/link-build/${{matrix.tag}}-profile.zip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{matrix.tag}}
           path: ${{runner.temp}}/link-build/${{matrix.tag}}.zip
@@ -396,12 +396,12 @@ jobs:
     steps:
       - id: checkout
         name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: false
       - id: download
         name: Download
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{matrix.tag}}
           path: ${{runner.temp}}/release
@@ -428,6 +428,7 @@ jobs:
         name: Test (node runner)
         env:
           SMTP_SENDGRID_SENDER: ${{ secrets.SMTP_SENDGRID_SENDER }}
+          TMPDIR: ${{runner.temp}}
           TLS_MONGODB_DATABASE_URL: ${{ secrets.TLS_MONGODB_DATABASE_URL }}
           TLS_POSTGRES_DATABASE_URL: ${{ secrets.TLS_POSTGRES_DATABASE_URL }}
         # if: ${{github.event.inputs.use_bun == 'false'}}
diff --git a/.github/workflows/bun-mac-x64.yml b/.github/workflows/bun-mac-x64.yml
index affdc7228c..753a391f22 100644
--- a/.github/workflows/bun-mac-x64.yml
+++ b/.github/workflows/bun-mac-x64.yml
@@ -52,20 +52,20 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Setup Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
         id: buildx
         with:
           install: true
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Compile Zig Object
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: false
@@ -94,7 +94,7 @@ jobs:
           outputs: type=local,dest=${{runner.temp}}/release
 
       - name: Upload Zig Object
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.tag }}
           path: ${{runner.temp}}/release/bun-zig.o
@@ -144,7 +144,7 @@ jobs:
 
       - name: Cache submodule dependencies
         id: cache-deps-restore
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: ${{runner.temp}}/bun-deps
           key: bun-deps-${{ matrix.tag }}-${{ steps.submodule-versions.outputs.sha }}
@@ -162,13 +162,13 @@ jobs:
       - name: Cache submodule dependencies
         if: ${{ !steps.cache-deps-restore.outputs.cache-hit }}
         id: cache-deps-save
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         with:
           path: ${{runner.temp}}/bun-deps
           key: ${{ steps.cache-deps-restore.outputs.cache-primary-key }}
 
       - name: Upload submodule dependencies
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.tag }}-deps
           path: ${{runner.temp}}/bun-deps
@@ -238,7 +238,7 @@ jobs:
           bash compile-cpp-only.sh -v
 
       - name: Upload C++
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.tag }}-cpp
           path: ${{ runner.temp }}/bun-cpp-obj/bun-cpp-objects.a
@@ -260,7 +260,7 @@ jobs:
             runner: macos-12-large
             artifact: bun-obj-darwin-x64
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Checkout submodules
         run: git submodule update --init --recursive --depth=1 --progress --force
 
@@ -284,19 +284,19 @@ jobs:
           echo "${{ runner.temp }}/.bun/bin" >> $GITHUB_PATH
 
       - name: Download C++
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ matrix.tag }}-cpp
           path: ${{ runner.temp }}/bun-cpp-obj
 
       - name: Download Zig Object
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ matrix.obj }}
           path: ${{ runner.temp }}/release
 
       - name: Downloaded submodule dependencies
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ matrix.tag }}-deps
           path: ${{runner.temp}}/bun-deps
@@ -329,11 +329,11 @@ jobs:
 
           zip -r ${{matrix.tag}}-profile.zip ${{matrix.tag}}-profile
           zip -r ${{matrix.tag}}.zip ${{matrix.tag}}
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{matrix.tag}}-profile
           path: ${{runner.temp}}/link-build/${{matrix.tag}}-profile.zip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{matrix.tag}}
           path: ${{runner.temp}}/link-build/${{matrix.tag}}.zip
@@ -393,12 +393,12 @@ jobs:
     steps:
       - id: checkout
         name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: false
       - id: download
         name: Download
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{matrix.tag}}
           path: ${{runner.temp}}/release
@@ -426,6 +426,7 @@ jobs:
         env:
           SMTP_SENDGRID_SENDER: ${{ secrets.SMTP_SENDGRID_SENDER }}
           TLS_MONGODB_DATABASE_URL: ${{ secrets.TLS_MONGODB_DATABASE_URL }}
+          TMPDIR: ${{runner.temp}}
           TLS_POSTGRES_DATABASE_URL: ${{ secrets.TLS_POSTGRES_DATABASE_URL }}
         # if: ${{github.event.inputs.use_bun == 'false'}}
         run: |
diff --git a/.github/workflows/bun-release.yml b/.github/workflows/bun-release.yml
index f56a14b65b..89ca850737 100644
--- a/.github/workflows/bun-release.yml
+++ b/.github/workflows/bun-release.yml
@@ -51,7 +51,7 @@ jobs:
         working-directory: packages/bun-release
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup GPG
         uses: crazy-max/ghaction-import-gpg@v5
         with:
@@ -81,7 +81,7 @@ jobs:
         working-directory: packages/bun-release
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup Bun
         uses: oven-sh/setup-bun@v1
         with:
@@ -105,7 +105,7 @@ jobs:
         working-directory: packages/bun-types
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
@@ -170,12 +170,12 @@ jobs:
             suffix: -distroless
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup Docker emulator
         uses: docker/setup-qemu-action@v2
       - id: buildx
         name: Setup Docker buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
         with:
           platforms: linux/amd64,linux/arm64
       - id: metadata
@@ -192,12 +192,12 @@ jobs:
             type=match,pattern=(bun-v)?(canary|\d+.\d+),group=2,value=${{ env.BUN_VERSION }},suffix=${{ matrix.suffix }}
             type=match,pattern=(bun-v)?(canary|\d+),group=2,value=${{ env.BUN_VERSION }},suffix=${{ matrix.suffix }}
       - name: Login to Docker
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Push to Docker
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v5
         with:
           context: ./dockerhub/${{ matrix.dir || matrix.variant }}
           platforms: linux/amd64,linux/arm64
@@ -216,7 +216,7 @@ jobs:
     if: ${{ github.event_name == 'release' || github.event.inputs.use-homebrew == 'true' }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: oven-sh/homebrew-bun
           token: ${{ secrets.ROBOBUN_TOKEN }}
@@ -252,7 +252,7 @@ jobs:
         working-directory: packages/bun-release
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup Bun
         uses: oven-sh/setup-bun@v1
         with:
diff --git a/.github/workflows/bun-types-tests.yml b/.github/workflows/bun-types-tests.yml
index bf3f591aa6..6fe222e71c 100644
--- a/.github/workflows/bun-types-tests.yml
+++ b/.github/workflows/bun-types-tests.yml
@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install bun
         uses: oven-sh/setup-bun@v1
diff --git a/.github/workflows/bun-windows.yml b/.github/workflows/bun-windows.yml
index e74f2843c8..33c6a6e38b 100644
--- a/.github/workflows/bun-windows.yml
+++ b/.github/workflows/bun-windows.yml
@@ -60,13 +60,13 @@ jobs:
       - run: git config --global core.autocrlf false && git config --global core.eol lf
       - uses: actions/checkout@v4
       - name: Setup Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
         id: buildx
         with:
           install: true
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -79,7 +79,7 @@ jobs:
           echo "canary_revision=$(GITHUB_TOKEN="${{ secrets.GITHUB_TOKEN }}" bash ./scripts/calculate-canary-revision.sh --raw)" >> $GITHUB_OUTPUT
 
       - name: Compile Zig Object
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v5
         if: runner.arch == 'X64'
         with:
           context: .
@@ -102,7 +102,7 @@ jobs:
           outputs: type=local,dest=${{runner.temp}}/release
 
       - name: Upload Zig Object
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}-zig${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}
           path: ${{runner.temp}}/release/bun-zig.o
@@ -138,7 +138,7 @@ jobs:
 
       - name: Try fetch dependencies
         id: cache-deps-restore
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: bun-deps
           key: bun-deps-${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}-${{ steps.submodule-versions.outputs.sha }}
@@ -165,7 +165,7 @@ jobs:
           .\scripts\all-dependencies.ps1
 
       - name: Upload Dependencies
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}-deps${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}
           path: bun-deps/
@@ -173,7 +173,7 @@ jobs:
       - name: Cache Dependencies
         if: ${{ !steps.cache-deps-restore.outputs.cache-hit }}
         id: cache-deps-save
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         with:
           path: bun-deps
           key: ${{ steps.cache-deps-restore.outputs.cache-primary-key }}
@@ -204,7 +204,7 @@ jobs:
         if: ${{ env.canary == 'true' }}
         run: |
           echo "canary_revision=$(GITHUB_TOKEN="${{ secrets.GITHUB_TOKEN }}" bash ./scripts/calculate-canary-revision.sh --raw)" > build-codegen-win32-x64/.canary_revision
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}-codegen
           path: build-codegen-win32-x64/
@@ -228,7 +228,7 @@ jobs:
           version: ${{ env.LLVM_VERSION }}
       - run: choco install -y ninja
       - name: Download Codegen
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}-codegen
           path: build
@@ -263,7 +263,7 @@ jobs:
           if ($LASTEXITCODE -ne 0) { throw "CMake configuration failed" }
           .\compile-cpp-only.ps1 -v
           if ($LASTEXITCODE -ne 0) { throw "C++ compilation failed" }
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}-cpp${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}
           path: build/bun-cpp-objects.a
@@ -288,22 +288,22 @@ jobs:
           version: ${{ env.LLVM_VERSION }}
       - run: choco install -y ninja
       - name: Download Codegen
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}-codegen
           path: build
       - name: Download Dependencies
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}-deps${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}
           path: bun-deps
       - name: Download Zig Object
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}-zig${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}
           path: bun-zig
       - name: Download C++ Objects
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}-cpp${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}
           path: bun-cpp
@@ -336,11 +336,11 @@ jobs:
           cp -r build\bun.pdb "$Dist\bun.pdb"
           Compress-Archive "$Dist" "$Dist.zip"
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}
           path: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}.zip
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}-profile
           path: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}-profile.zip
@@ -398,12 +398,12 @@ jobs:
       - run: git config --global core.autocrlf false && git config --global core.eol lf
       - id: checkout
         name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: false
       - id: download
         name: Download Release
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.tag }}-${{ matrix.arch == 'x86_64' && 'x64' || 'aarch64' }}${{ matrix.cpu == 'nehalem' && '-baseline' || '' }}-profile
           path: ${{runner.temp}}/release
@@ -431,6 +431,7 @@ jobs:
         name: Run tests
         env:
           SMTP_SENDGRID_SENDER: ${{ secrets.SMTP_SENDGRID_SENDER }}
+          TMPDIR: ${{runner.temp}}
           TLS_MONGODB_DATABASE_URL: ${{ secrets.TLS_MONGODB_DATABASE_URL }}
           TLS_POSTGRES_DATABASE_URL: ${{ secrets.TLS_POSTGRES_DATABASE_URL }}
         run: |
diff --git a/bunfig.toml b/bunfig.toml
index 99838d3ce6..fa1e4511ab 100644
--- a/bunfig.toml
+++ b/bunfig.toml
@@ -6,3 +6,4 @@
 #
 # Instead, we can only scan the test directory for Bun's runtime tests
 root = "test"
+preload = "./test/preload.ts"
diff --git a/docs/cli/install.md b/docs/cli/install.md
index 932f05a574..8c245dd5f7 100644
--- a/docs/cli/install.md
+++ b/docs/cli/install.md
@@ -195,7 +195,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install bun
         uses: oven-sh/setup-bun@v1
       - name: Install dependencies
diff --git a/docs/guides/runtime/cicd.md b/docs/guides/runtime/cicd.md
index 862dcff2c4..c6d6a36a3b 100644
--- a/docs/guides/runtime/cicd.md
+++ b/docs/guides/runtime/cicd.md
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # ...
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 +     - uses: oven-sh/setup-bun@v1
 
       # run any `bun` or `bunx` command
diff --git a/packages/bun-internal-test/src/runner.node.mjs b/packages/bun-internal-test/src/runner.node.mjs
index cec84753bf..14177e865d 100644
--- a/packages/bun-internal-test/src/runner.node.mjs
+++ b/packages/bun-internal-test/src/runner.node.mjs
@@ -1,10 +1,11 @@
 import * as action from "@actions/core";
 import { spawn, spawnSync } from "child_process";
-import { rmSync, writeFileSync, readFileSync } from "fs";
+import { rmSync, writeFileSync, readFileSync, mkdirSync, openSync, close, closeSync } from "fs";
 import { readFile } from "fs/promises";
 import { readdirSync } from "node:fs";
 import { resolve, basename } from "node:path";
-import { cpus, hostname, totalmem, userInfo } from "os";
+import { cpus, hostname, tmpdir, totalmem, userInfo } from "os";
+import { join } from "path";
 import { fileURLToPath } from "url";
 
 const run_start = new Date();
@@ -24,6 +25,20 @@ process.chdir(cwd);
 const ci = !!process.env["GITHUB_ACTIONS"];
 const enableProgressBar = !ci;
 
+var prevTmpdir = "";
+function maketemp() {
+  if (prevTmpdir && !windows) {
+    spawn("rm", ["-rf", prevTmpdir], { stdio: "inherit", detached: true }).unref();
+  }
+
+  prevTmpdir = join(
+    tmpdir(),
+    "bun-test-tmp-" + (Date.now() | 0).toString() + "_" + ((Math.random() * 100_000_0) | 0).toString(36),
+  );
+  mkdirSync(prevTmpdir, { recursive: true });
+  return prevTmpdir;
+}
+
 function defaultConcurrency() {
   // Concurrency causes more flaky tests, only enable it by default on windows
   // See https://github.com/oven-sh/bun/issues/8071
@@ -40,10 +55,19 @@ const extensions = [".js", ".ts", ".jsx", ".tsx"];
 const git_sha =
   process.env["GITHUB_SHA"] ?? spawnSync("git", ["rev-parse", "HEAD"], { encoding: "utf-8" }).stdout.trim();
 
+const TEST_FILTER = process.env.BUN_TEST_FILTER;
+
 function isTest(path) {
   if (!basename(path).includes(".test.") || !extensions.some(ext => path.endsWith(ext))) {
     return false;
   }
+
+  if (TEST_FILTER) {
+    if (!path.includes(TEST_FILTER)) {
+      return false;
+    }
+  }
+
   return true;
 }
 
@@ -100,6 +124,33 @@ const failing_tests = [];
 const passing_tests = [];
 const fixes = [];
 const regressions = [];
+let maxFd = -1;
+function getMaxFileDescriptor(path) {
+  if (process.platform === "win32") {
+    return -1;
+  }
+
+  hasInitialMaxFD = true;
+
+  if (process.platform === "linux") {
+    try {
+      readdirSync("/proc/self/fd").forEach(name => {
+        const fd = parseInt(name.trim(), 10);
+        if (Number.isSafeInteger(fd) && fd >= 0) {
+          maxFd = Math.max(maxFd, fd);
+        }
+      });
+
+      return maxFd;
+    } catch {}
+  }
+
+  const devnullfd = openSync("/dev/null", "r");
+  closeSync(devnullfd);
+  maxFd = devnullfd + 1;
+  return maxFd;
+}
+let hasInitialMaxFD = false;
 
 async function runTest(path) {
   const name = path.replace(cwd, "").slice(1);
@@ -107,14 +158,16 @@ async function runTest(path) {
 
   const expected_crash_reason = windows
     ? await readFile(resolve(path), "utf-8").then(data => {
-      const match = data.match(/@known-failing-on-windows:(.*)\n/);
-      return match ? match[1].trim() : null;
-    })
+        const match = data.match(/@known-failing-on-windows:(.*)\n/);
+        return match ? match[1].trim() : null;
+      })
     : null;
 
   const start = Date.now();
 
-  await new Promise((done, reject) => {
+  await new Promise((finish, reject) => {
+    const chunks = [];
+
     const proc = spawn(bunExe, ["test", resolve(path)], {
       stdio: ["ignore", "pipe", "pipe"],
       timeout: 1000 * 60 * 3,
@@ -127,10 +180,26 @@ async function runTest(path) {
         // reproduce CI results locally
         GITHUB_ACTIONS: process.env.GITHUB_ACTIONS ?? "true",
         BUN_DEBUG_QUIET_LOGS: "1",
+        TMPDIR: maketemp(),
       },
     });
+    proc.stdout.once("end", () => {
+      done();
+    });
+
+    let doneCalls = 0;
+    let done = () => {
+      // TODO: wait for stderr as well
+      // spawn.test currently causes it to hang
+      if (doneCalls++ == 1) {
+        actuallyDone();
+      }
+    };
+    function actuallyDone() {
+      output = Buffer.concat(chunks).toString();
+      finish();
+    }
 
-    const chunks = [];
     proc.stdout.on("data", chunk => {
       chunks.push(chunk);
       if (run_concurrency === 1) process.stdout.write(chunk);
@@ -140,18 +209,32 @@ async function runTest(path) {
       if (run_concurrency === 1) process.stderr.write(chunk);
     });
 
-    proc.on("exit", (code_, signal_) => {
+    proc.once("exit", (code_, signal_) => {
       exitCode = code_;
       signal = signal_;
-      output = Buffer.concat(chunks).toString();
       done();
     });
-    proc.on("error", err_ => {
+    proc.once("error", err_ => {
       err = err_;
-      done();
+      done = () => {};
+      actuallyDone();
     });
   });
 
+  if (!hasInitialMaxFD) {
+    getMaxFileDescriptor();
+  } else if (maxFd > 0) {
+    const prevMaxFd = maxFd;
+    maxFd = getMaxFileDescriptor();
+    if (maxFd > prevMaxFd) {
+      process.stderr.write(
+        `\n\x1b[31mewarn\x1b[0;2m:\x1b[0m file descriptor leak in ${name}, delta: ${
+          maxFd - prevMaxFd
+        }, current: ${maxFd}, previous: ${prevMaxFd}\n`,
+      );
+    }
+  }
+
   const passed = exitCode === 0 && !err && !signal;
 
   let reason = "";
@@ -195,7 +278,8 @@ async function runTest(path) {
   }
 
   console.log(
-    `\x1b[2m${formatTime(duration).padStart(6, " ")}\x1b[0m ${passed ? "\x1b[32m✔" : expected_crash_reason ? "\x1b[33m⚠" : "\x1b[31m✖"
+    `\x1b[2m${formatTime(duration).padStart(6, " ")}\x1b[0m ${
+      passed ? "\x1b[32m✔" : expected_crash_reason ? "\x1b[33m⚠" : "\x1b[31m✖"
     } ${name}\x1b[0m${reason ? ` (${reason})` : ""}`,
   );
 
@@ -319,9 +403,10 @@ console.log("\n" + "-".repeat(Math.min(process.stdout.columns || 40, 80)) + "\n"
 console.log(header);
 console.log("\n" + "-".repeat(Math.min(process.stdout.columns || 40, 80)) + "\n");
 
-let report = `# bun test on ${process.env["GITHUB_REF"] ??
+let report = `# bun test on ${
+  process.env["GITHUB_REF"] ??
   spawnSync("git", ["rev-parse", "--abbrev-ref", "HEAD"], { encoding: "utf-8" }).stdout.trim()
-  }
+}
 
 \`\`\`
 ${header}
@@ -345,7 +430,8 @@ if (regressions.length > 0) {
   report += regressions
     .map(
       ({ path, reason, expected_crash_reason }) =>
-        `- [\`${path}\`](${sectionLink(path)}) ${reason}${expected_crash_reason ? ` (expected: ${expected_crash_reason})` : ""
+        `- [\`${path}\`](${sectionLink(path)}) ${reason}${
+          expected_crash_reason ? ` (expected: ${expected_crash_reason})` : ""
         }`,
     )
     .join("\n");
diff --git a/packages/bun-uws/.github/workflows/codeql.yml b/packages/bun-uws/.github/workflows/codeql.yml
index abafedce26..8da1909db7 100644
--- a/packages/bun-uws/.github/workflows/codeql.yml
+++ b/packages/bun-uws/.github/workflows/codeql.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/packages/bun-uws/.github/workflows/cpp.yml b/packages/bun-uws/.github/workflows/cpp.yml
index f6c761de53..44c68bb2e7 100644
--- a/packages/bun-uws/.github/workflows/cpp.yml
+++ b/packages/bun-uws/.github/workflows/cpp.yml
@@ -20,7 +20,7 @@ jobs:
         language: c++
         fuzz-seconds: 600
     - name: Upload crash
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: failure() && steps.build.outcome == 'success'
       with:
         name: artifacts
diff --git a/src/bun.js/bindings/bun-spawn.cpp b/src/bun.js/bindings/bun-spawn.cpp
index 407452ee38..ff83c5a57a 100644
--- a/src/bun.js/bindings/bun-spawn.cpp
+++ b/src/bun.js/bindings/bun-spawn.cpp
@@ -12,13 +12,14 @@
 #include <sys/syscall.h>
 #include <sys/resource.h>
 
-static int close_range(unsigned int first)
-{
-    return syscall(__NR_close_range, first, ~0U, 0);
-}
-
 extern char** environ;
 
+#ifndef CLOSE_RANGE_CLOEXEC
+#define CLOSE_RANGE_CLOEXEC (1U << 2)
+#endif
+
+extern "C" ssize_t bun_close_range(unsigned int start, unsigned int end, unsigned int flags);
+
 enum FileActionType : uint8_t {
     None,
     Close,
@@ -70,7 +71,7 @@ extern "C" ssize_t posix_spawn_bun(
     const auto childFailed = [&]() -> ssize_t {
         res = errno;
         status = res;
-        close_range(0);
+        bun_close_range(0, ~0U, 0);
         _exit(127);
 
         // should never be reached
@@ -151,7 +152,9 @@ extern "C" ssize_t posix_spawn_bun(
         if (!envp)
             envp = environ;
 
-        close_range(current_max_fd + 1);
+        if (bun_close_range(current_max_fd + 1, ~0U, CLOSE_RANGE_CLOEXEC) != 0) {
+            bun_close_range(current_max_fd + 1, ~0U, 0);
+        }
         execve(path, argv, envp);
         _exit(127);
 
diff --git a/src/bun.js/bindings/c-bindings.cpp b/src/bun.js/bindings/c-bindings.cpp
index f2109b0da3..27eb3cb350 100644
--- a/src/bun.js/bindings/c-bindings.cpp
+++ b/src/bun.js/bindings/c-bindings.cpp
@@ -171,7 +171,7 @@ extern "C" int clock_gettime_monotonic(int64_t* tv_sec, int64_t* tv_nsec)
 #endif
 
 // close_range is glibc > 2.33, which is very new
-static ssize_t bun_close_range(unsigned int start, unsigned int end, unsigned int flags)
+extern "C" ssize_t bun_close_range(unsigned int start, unsigned int end, unsigned int flags)
 {
     return syscall(__NR_close_range, start, end, flags);
 }
diff --git a/src/output.zig b/src/output.zig
index a29cd80c9f..78df0b8c9c 100644
--- a/src/output.zig
+++ b/src/output.zig
@@ -486,7 +486,7 @@ pub fn scoped(comptime tag: @Type(.EnumLiteral), comptime disabled: bool) _log_f
 
             if (!out_set) {
                 buffered_writer = .{
-                    .unbuffered_writer = writer(),
+                    .unbuffered_writer = scopedWriter(),
                 };
                 out = buffered_writer.writer();
                 out_set = true;
@@ -495,7 +495,7 @@ pub fn scoped(comptime tag: @Type(.EnumLiteral), comptime disabled: bool) _log_f
             lock.lock();
             defer lock.unlock();
 
-            if (Output.enable_ansi_colors_stderr) {
+            if (Output.enable_ansi_colors_stdout and buffered_writer.unbuffered_writer.context.handle == writer().context.handle) {
                 out.print(comptime prettyFmt("<r><d>[" ++ @tagName(tag) ++ "]<r> " ++ fmt, true), args) catch {
                     really_disable = true;
                     return;
@@ -804,6 +804,56 @@ pub inline fn err(error_name: anytype, comptime fmt: []const u8, args: anytype)
     }
 }
 
+fn scopedWriter() std.fs.File.Writer {
+    if (comptime !Environment.isDebug) {
+        @compileError("scopedWriter() should only be called in debug mode");
+    }
+
+    const Scoped = struct {
+        pub var loaded_env: ?bool = null;
+        pub var scoped_file_writer: std.fs.File.Writer = undefined;
+        pub var scoped_file_writer_lock: bun.Lock = bun.Lock.init();
+    };
+    std.debug.assert(source_set);
+    Scoped.scoped_file_writer_lock.lock();
+    defer Scoped.scoped_file_writer_lock.unlock();
+    const use_env = Scoped.loaded_env orelse brk: {
+        if (bun.getenvZ("BUN_DEBUG")) |path| {
+            if (path.len > 0 and !strings.eql(path, "0") and !strings.eql(path, "false")) {
+                if (std.fs.path.dirname(path)) |dir| {
+                    std.fs.cwd().makePath(dir) catch {};
+                }
+
+                // do not use libuv through this code path, since it might not be initialized yet.
+                const fd = std.os.openat(
+                    std.fs.cwd().fd,
+                    path,
+                    std.os.O.TRUNC | std.os.O.CREAT | std.os.O.WRONLY,
+                    0o644,
+                ) catch |err_| {
+                    // Ensure we don't panic inside panic
+                    Scoped.loaded_env = false;
+                    Scoped.scoped_file_writer_lock.unlock();
+                    Output.panic("Failed to open file for debug output: {s} ({s})", .{ @errorName(err_), path });
+                };
+                Scoped.scoped_file_writer = bun.toFD(fd).asFile().writer();
+                Scoped.loaded_env = true;
+                break :brk true;
+            }
+        }
+
+        Scoped.loaded_env = false;
+
+        break :brk false;
+    };
+
+    if (use_env) {
+        return Scoped.scoped_file_writer;
+    }
+
+    return source.stream.writer();
+}
+
 /// Print a red error message with "error: " as the prefix. For custom prefixes see `err()`
 pub inline fn errGeneric(comptime fmt: []const u8, args: anytype) void {
     prettyErrorln("<red>error<r><d>:<r> " ++ fmt, args);
diff --git a/test/cli/hot/hot.test.ts b/test/cli/hot/hot.test.ts
index 422f87eb67..37674913eb 100644
--- a/test/cli/hot/hot.test.ts
+++ b/test/cli/hot/hot.test.ts
@@ -1,258 +1,307 @@
 import { spawn } from "bun";
-import { expect, it } from "bun:test";
+import { beforeAll, beforeEach, expect, it } from "bun:test";
 import { bunExe, bunEnv, tempDirWithFiles, bunRun, bunRunAsScript } from "harness";
-import { readFileSync, renameSync, rmSync, unlinkSync, writeFileSync, copyFileSync } from "fs";
+import { cpSync, readFileSync, renameSync, rmSync, unlinkSync, writeFileSync, copyFileSync } from "fs";
 import { join } from "path";
+import { tmpdir } from "os";
 
-const hotRunnerRoot = join(import.meta.dir, "hot-runner-root.js");
+let hotRunnerRoot: string = "",
+  cwd = "";
+beforeEach(() => {
+  const hotPath = join(tmpdir(), "bun-hot-test-" + (Date.now() | 0) + "_" + Math.random().toString(36).slice(2));
+  hotRunnerRoot = join(hotPath, "hot-runner-root.js");
+  rmSync(hotPath, { recursive: true, force: true });
+  cpSync(import.meta.dir, hotPath, { recursive: true, force: true });
+  cwd = hotPath;
+});
 
 it("should hot reload when file is overwritten", async () => {
   const root = hotRunnerRoot;
-  const runner = spawn({
-    cmd: [bunExe(), "--hot", "run", root],
-    env: bunEnv,
-    stdout: "pipe",
-    stderr: "inherit",
-    stdin: "ignore",
-  });
+  try {
+    var runner = spawn({
+      cmd: [bunExe(), "--hot", "run", root],
+      env: bunEnv,
+      cwd,
+      stdout: "pipe",
+      stderr: "inherit",
+      stdin: "ignore",
+    });
 
-  var reloadCounter = 0;
+    var reloadCounter = 0;
 
-  async function onReload() {
-    writeFileSync(root, readFileSync(root, "utf-8"));
-  }
-
-  for await (const line of runner.stdout) {
-    var str = new TextDecoder().decode(line);
-    var any = false;
-    for (let line of str.split("\n")) {
-      if (!line.includes("[#!root]")) continue;
-      reloadCounter++;
-
-      if (reloadCounter === 3) {
-        runner.unref();
-        runner.kill();
-        break;
-      }
-
-      expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
-      any = true;
+    async function onReload() {
+      writeFileSync(root, readFileSync(root, "utf-8"));
     }
 
-    if (any) await onReload();
-  }
+    for await (const line of runner.stdout) {
+      var str = new TextDecoder().decode(line);
+      var any = false;
+      for (let line of str.split("\n")) {
+        if (!line.includes("[#!root]")) continue;
+        reloadCounter++;
 
-  expect(reloadCounter).toBe(3);
+        if (reloadCounter === 3) {
+          runner.unref();
+          runner.kill();
+          break;
+        }
+
+        expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
+        any = true;
+      }
+
+      if (any) await onReload();
+    }
+
+    expect(reloadCounter).toBe(3);
+  } finally {
+    // @ts-ignore
+    runner?.unref?.();
+    // @ts-ignore
+    runner?.kill?.(9);
+  }
 });
 
 it("should recover from errors", async () => {
   const root = hotRunnerRoot;
-  const runner = spawn({
-    cmd: [bunExe(), "--hot", "run", root],
-    env: bunEnv,
-    stdout: "pipe",
-    stderr: "pipe",
-    stdin: "ignore",
-  });
+  try {
+    var runner = spawn({
+      cmd: [bunExe(), "--hot", "run", root],
+      env: bunEnv,
+      cwd,
+      stdout: "pipe",
+      stderr: "pipe",
+      stdin: "ignore",
+    });
 
-  let reloadCounter = 0;
-  const input = readFileSync(root, "utf-8");
-  function onReloadGood() {
-    writeFileSync(root, input);
-  }
-
-  function onReloadError() {
-    writeFileSync(root, "throw new Error('error');\n");
-  }
-
-  var queue = [onReloadError, onReloadGood, onReloadError, onReloadGood];
-  var errors: string[] = [];
-  var onError: (...args: any[]) => void;
-  (async () => {
-    for await (let line of runner.stderr) {
-      var str = new TextDecoder().decode(line);
-      errors.push(str);
-      // @ts-ignore
-      onError && onError(str);
+    let reloadCounter = 0;
+    const input = readFileSync(root, "utf-8");
+    function onReloadGood() {
+      writeFileSync(root, input);
     }
-  })();
 
-  for await (const line of runner.stdout) {
-    var str = new TextDecoder().decode(line);
-    var any = false;
-    for (let line of str.split("\n")) {
-      if (!line.includes("[#!root]")) continue;
-      reloadCounter++;
+    function onReloadError() {
+      writeFileSync(root, "throw new Error('error');\n");
+    }
 
-      if (reloadCounter === 3) {
-        runner.unref();
-        runner.kill();
-        break;
+    var queue = [onReloadError, onReloadGood, onReloadError, onReloadGood];
+    var errors: string[] = [];
+    var onError: (...args: any[]) => void;
+    (async () => {
+      for await (let line of runner.stderr) {
+        var str = new TextDecoder().decode(line);
+        errors.push(str);
+        // @ts-ignore
+        onError && onError(str);
       }
+    })();
 
-      expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
-      any = true;
-    }
+    for await (const line of runner.stdout) {
+      var str = new TextDecoder().decode(line);
+      var any = false;
+      for (let line of str.split("\n")) {
+        if (!line.includes("[#!root]")) continue;
+        reloadCounter++;
 
-    if (any) {
-      queue.shift()!();
-      await new Promise<void>((resolve, reject) => {
-        if (errors.length > 0) {
-          errors.length = 0;
-          resolve();
-          return;
+        if (reloadCounter === 3) {
+          runner.unref();
+          runner.kill();
+          break;
         }
 
-        onError = resolve;
-      });
+        expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
+        any = true;
+      }
 
-      queue.shift()!();
+      if (any) {
+        queue.shift()!();
+        await new Promise<void>((resolve, reject) => {
+          if (errors.length > 0) {
+            errors.length = 0;
+            resolve();
+            return;
+          }
+
+          onError = resolve;
+        });
+
+        queue.shift()!();
+      }
     }
-  }
 
-  expect(reloadCounter).toBe(3);
+    expect(reloadCounter).toBe(3);
+  } finally {
+    // @ts-ignore
+    runner?.unref?.();
+    // @ts-ignore
+    runner?.kill?.(9);
+  }
 });
 
 it("should not hot reload when a random file is written", async () => {
   const root = hotRunnerRoot;
-  const runner = spawn({
-    cmd: [bunExe(), "--hot", "run", root],
-    env: bunEnv,
-    stdout: "pipe",
-    stderr: "inherit",
-    stdin: "ignore",
-  });
+  try {
+    var runner = spawn({
+      cmd: [bunExe(), "--hot", "run", root],
+      env: bunEnv,
+      cwd,
+      stdout: "pipe",
+      stderr: "inherit",
+      stdin: "ignore",
+    });
 
-  let reloadCounter = 0;
-  const code = readFileSync(root, "utf-8");
-  async function onReload() {
-    writeFileSync(root + ".another.yet.js", code);
-    unlinkSync(root + ".another.yet.js");
-  }
-  var waiter = new Promise<void>((resolve, reject) => {
-    setTimeout(async () => {
-      resolve();
-    }, 50);
-  });
-  var finished = false;
-  await Promise.race([
-    waiter,
-    (async () => {
-      if (finished) {
-        return;
-      }
-      for await (const line of runner.stdout) {
+    let reloadCounter = 0;
+    const code = readFileSync(root, "utf-8");
+    async function onReload() {
+      writeFileSync(root + ".another.yet.js", code);
+      unlinkSync(root + ".another.yet.js");
+    }
+    var waiter = new Promise<void>((resolve, reject) => {
+      setTimeout(async () => {
+        resolve();
+      }, 50);
+    });
+    var finished = false;
+    await Promise.race([
+      waiter,
+      (async () => {
         if (finished) {
           return;
         }
-
-        var str = new TextDecoder().decode(line);
-        for (let line of str.split("\n")) {
-          if (!line.includes("[#!root]")) continue;
+        for await (const line of runner.stdout) {
           if (finished) {
             return;
           }
-          await onReload();
 
-          reloadCounter++;
-          expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
+          var str = new TextDecoder().decode(line);
+          for (let line of str.split("\n")) {
+            if (!line.includes("[#!root]")) continue;
+            if (finished) {
+              return;
+            }
+            await onReload();
+
+            reloadCounter++;
+            expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
+          }
         }
-      }
-    })(),
-  ]);
-  finished = true;
-  runner.kill(0);
-  runner.unref();
+      })(),
+    ]);
+    finished = true;
+    runner.kill(0);
+    runner.unref();
 
-  expect(reloadCounter).toBe(1);
+    expect(reloadCounter).toBe(1);
+  } finally {
+    // @ts-ignore
+    runner?.unref?.();
+    // @ts-ignore
+    runner?.kill?.(9);
+  }
 });
 
 it("should hot reload when a file is deleted and rewritten", async () => {
-  const root = hotRunnerRoot + ".tmp.js";
-  copyFileSync(hotRunnerRoot, root);
-  const runner = spawn({
-    cmd: [bunExe(), "--hot", "run", root],
-    env: bunEnv,
-    stdout: "pipe",
-    stderr: "inherit",
-    stdin: "ignore",
-  });
+  try {
+    const root = hotRunnerRoot + ".tmp.js";
+    copyFileSync(hotRunnerRoot, root);
+    var runner = spawn({
+      cmd: [bunExe(), "--hot", "run", root],
+      env: bunEnv,
+      cwd,
+      stdout: "pipe",
+      stderr: "inherit",
+      stdin: "ignore",
+    });
 
-  var reloadCounter = 0;
+    var reloadCounter = 0;
 
-  async function onReload() {
-    const contents = readFileSync(root, "utf-8");
-    rmSync(root);
-    writeFileSync(root, contents);
-  }
-
-  for await (const line of runner.stdout) {
-    var str = new TextDecoder().decode(line);
-    var any = false;
-    for (let line of str.split("\n")) {
-      if (!line.includes("[#!root]")) continue;
-      reloadCounter++;
-
-      if (reloadCounter === 3) {
-        runner.unref();
-        runner.kill();
-        break;
-      }
-
-      expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
-      any = true;
+    async function onReload() {
+      const contents = readFileSync(root, "utf-8");
+      rmSync(root);
+      writeFileSync(root, contents);
     }
 
-    if (any) await onReload();
+    for await (const line of runner.stdout) {
+      var str = new TextDecoder().decode(line);
+      var any = false;
+      for (let line of str.split("\n")) {
+        if (!line.includes("[#!root]")) continue;
+        reloadCounter++;
+
+        if (reloadCounter === 3) {
+          runner.unref();
+          runner.kill();
+          break;
+        }
+
+        expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
+        any = true;
+      }
+
+      if (any) await onReload();
+    }
+    rmSync(root);
+    expect(reloadCounter).toBe(3);
+  } finally {
+    // @ts-ignore
+    runner?.unref?.();
+    // @ts-ignore
+    runner?.kill?.(9);
   }
-  rmSync(root);
-  expect(reloadCounter).toBe(3);
 });
 
 it("should hot reload when a file is renamed() into place", async () => {
   const root = hotRunnerRoot + ".tmp.js";
   copyFileSync(hotRunnerRoot, root);
-  const runner = spawn({
-    cmd: [bunExe(), "--hot", "run", root],
-    env: bunEnv,
-    stdout: "pipe",
-    stderr: "inherit",
-    stdin: "ignore",
-  });
+  try {
+    var runner = spawn({
+      cmd: [bunExe(), "--hot", "run", root],
+      env: bunEnv,
+      cwd,
+      stdout: "pipe",
+      stderr: "inherit",
+      stdin: "ignore",
+    });
 
-  var reloadCounter = 0;
+    var reloadCounter = 0;
 
-  async function onReload() {
-    const contents = readFileSync(root, "utf-8");
-    rmSync(root + ".tmpfile", { force: true });
-    await 1;
-    writeFileSync(root + ".tmpfile", contents);
-    await 1;
-    rmSync(root);
-    await 1;
-    renameSync(root + ".tmpfile", root);
-    await 1;
-  }
-
-  for await (const line of runner.stdout) {
-    var str = new TextDecoder().decode(line);
-    var any = false;
-    for (let line of str.split("\n")) {
-      if (!line.includes("[#!root]")) continue;
-      reloadCounter++;
-
-      if (reloadCounter === 3) {
-        runner.unref();
-        runner.kill();
-        break;
-      }
-
-      expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
-      any = true;
+    async function onReload() {
+      const contents = readFileSync(root, "utf-8");
+      rmSync(root + ".tmpfile", { force: true });
+      await 1;
+      writeFileSync(root + ".tmpfile", contents);
+      await 1;
+      rmSync(root);
+      await 1;
+      renameSync(root + ".tmpfile", root);
+      await 1;
     }
 
-    if (any) await onReload();
+    for await (const line of runner.stdout) {
+      var str = new TextDecoder().decode(line);
+      var any = false;
+      for (let line of str.split("\n")) {
+        if (!line.includes("[#!root]")) continue;
+        reloadCounter++;
+
+        if (reloadCounter === 3) {
+          runner.unref();
+          runner.kill();
+          break;
+        }
+
+        expect(line).toContain(`[#!root] Reloaded: ${reloadCounter}`);
+        any = true;
+      }
+
+      if (any) await onReload();
+    }
+    rmSync(root);
+    expect(reloadCounter).toBe(3);
+  } finally {
+    // @ts-ignore
+    runner?.unref?.();
+    // @ts-ignore
+    runner?.kill?.(9);
   }
-  rmSync(root);
-  expect(reloadCounter).toBe(3);
 });
diff --git a/test/js/node/watch/fs.watchFile.test.ts b/test/js/node/watch/fs.watchFile.test.ts
index ff84cd1841..6a3905b6a7 100644
--- a/test/js/node/watch/fs.watchFile.test.ts
+++ b/test/js/node/watch/fs.watchFile.test.ts
@@ -7,7 +7,7 @@ import { describe, expect, test } from "bun:test";
 // before it is actually watching, we need to repeat the operation to avoid
 // a race condition.
 function repeat(fn: any) {
-  const interval = setInterval(fn, 20);
+  const interval = setInterval(fn, 20).unref();
   return interval;
 }
 const encodingFileName = `新建文夹件.txt`;
diff --git a/test/preload.ts b/test/preload.ts
new file mode 100644
index 0000000000..9216ac179d
--- /dev/null
+++ b/test/preload.ts
@@ -0,0 +1,10 @@
+import * as harness from "./harness";
+
+// We make Bun.env read-only
+// so process.env = {} causes them to be out of sync and we assume Bun.env is
+for (let key in process.env) {
+  if (key === "TZ") continue;
+  delete process.env[key];
+}
+
+Bun.$.env(Object.assign(process.env, harness.bunEnv));