Implement CSS Module Scripts (https://web.dev/articles/css-module-scripts)
for Bun's bundler. When importing CSS with `{ type: 'css' }` attribute:
```javascript
import sheet from './styles.css' with { type: 'css' };
// or dynamically:
const module = await import('./styles.css', { with: { type: 'css' } });
```
The import now returns a CSSStyleSheet object that can be used with
`document.adoptedStyleSheets`, instead of the previous behavior of
returning an empty object or file path.
Changes:
- Add `__cssModuleScript` runtime helper that creates CSSStyleSheet
- Add `is_css_module_script` flag to ImportRecord
- Track CSS Module Script files in LinkerGraph
- Generate `__cssModuleScript(cssContent)` for CSS imports with type assertion
- Handle both static and dynamic imports correctly
- Preserve existing CSS Modules behavior (class name mappings) for
imports without the type assertion
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
## Summary
Fixes#23292
`fs.access()` and `fs.accessSync()` threw EUNKNOWN (-134) when checking
named pipes on Windows (paths like `\.\pipe\name`), but Node.js worked
fine.
**Repro:**
```ts
// Server creates pipe at \.\pipe\bun-test
import net from 'net';
const server = net.createServer();
server.listen('\\.\pipe\bun-test');
// Client tries to check if pipe exists
import fs from 'fs';
fs.accessSync('\\.\pipe\bun-test', fs.constants.F_OK);
// Error: EUNKNOWN: unknown error, access '\.\pipe\bun-test'
```
## Root Cause
The `osPathKernel32` function normalizes paths before passing to Windows
APIs. The normalization logic treats a single `.` as a "current
directory" component and removes it, so `\.\pipe\name` incorrectly
became `\pipe\name` - an invalid path.
## Solution
Detect Windows device paths (starting with `\.\` or `\?\`) and skip
normalization for these special paths, preserving the device prefix.
## Test Plan
- [x] Added regression test `test/regression/issue/23292.test.ts`
- [x] Test fails with system bun (v1.3.3): 3 failures (EUNKNOWN)
- [x] Test passes with fix: 4 pass
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## Summary
- Add `cpu_profile` and `heap_snapshot` counters to `Analytics.Features`
- Export `heap_snapshot` to C++ as `Bun__Feature__heap_snapshot`
- Increment `cpu_profile` when `--cpu-prof` flag is used
- Increment `heap_snapshot` in all heap snapshot creation locations:
- `Bun.generateHeapSnapshot()`
- `bun:jsc` `generateHeapSnapshotForDebugging()`
- `console.takeHeapSnapshot()`
- Internal `JSC__JSGlobalObject__generateHeapSnapshot()`
## Test plan
- [x] Build succeeds
- [x] Heap snapshot generation works
- [x] CPU profiling works with `--cpu-prof`
- [x] Existing tests pass: `test/js/bun/util/v8-heap-snapshot.test.ts`
- [x] Existing tests pass: `test/cli/run/cpu-prof.test.ts`
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Added `http_client_proxy` counter to `analytics.Features` struct
- Incremented counter in `ProxyTunnel.onOpen()` when proxy tunnel
connection opens successfully
This allows tracking HTTP client proxy usage in analytics/crash reports
alongside other features like `fetch`, `WebSocket`, `http_server`, etc.
## Test plan
- [x] Build completes successfully (`bun bd`)
- [x] Existing proxy tests pass (`bun bd test
test/js/bun/http/proxy.test.ts`)
- [x] Counter is properly integrated into the analytics framework
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
Fixes a crash (ENG-22243) where calling class constructors marked with
`call: false` would create invalid instances instead of throwing an
error.
## Root Cause
When a class definition has `call: false` (like `Bun.RedisClient`), the
code generator was still allowing the constructor to be invoked without
`new`. This created invalid instances that caused a buffer overflow
during garbage collection.
## The Fix
Modified `src/codegen/generate-classes.ts` to properly check the `call`
property:
- When `call: false`: throws `TypeError: Class constructor X cannot be
invoked without 'new'`
- When `call: true`: behaves as before, allowing construction without
`new`
## Test Plan
- [x] Added regression test in `test/regression/issue/22243.test.ts`
- [x] Test fails with system bun (has the bug)
- [x] Test passes with fixed build
- [x] Verified `Bun.RedisClient()` now throws proper error
- [x] Verified `new Bun.RedisClient()` still works
## Before
```bash
$ bun -e "Bun.RedisClient()"
# Creates invalid instance, no error
```
## After
```bash
$ bun -e "Bun.RedisClient()"
TypeError: Class constructor RedisClient cannot be invoked without 'new'
```
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
### What does this PR do?
- Bumps some packages
- Does some _best practices_ in certain areas to minimize Aikido noise.
### How did you verify your code works?
CI.
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## Summary
- Fix `spyOn` crash when using indexed property keys (e.g., `spyOn(arr,
0)`)
## Test plan
- [x] Added tests for `spyOn` with numeric indexed properties
- [x] Added tests for `spyOn` with string indexed properties (e.g.,
`"0"`)
- [x] All existing `spyOn` tests pass
- [x] Full `mock-fn.test.js` test suite passes
Fixes ENG-21973
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Fix assertion failure when `Bun.indexOfLine` is called with a
non-number offset argument
- Changed from `.to(u32)` to `.coerce(i32, globalThis)` for proper
JavaScript type coercion
## Test plan
- [x] Added regression test in `test/js/bun/util/index-of-line.test.ts`
- [x] `bun bd test test/js/bun/util/index-of-line.test.ts` passes
Closes ENG-21997
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
## Summary
- Fix off-by-one error in `preprocessUpdateRequests` where the bounds
check used `>` instead of `>=` when validating package IDs from the
resolution buffer
- When `old_resolution == packages.len`, the check `> packages.len`
passes but `resolutions_of_yore[old_resolution]` is out of bounds since
valid indices are `0` to `packages.len-1`
- This causes an internal assertion failure during `bun install` with
update requests
## The Bug
```zig
// BEFORE (buggy) - at lockfile.zig:484 and :522
if (old_resolution > old.packages.len) continue;
const res = resolutions_of_yore[old_resolution]; // OOB when old_resolution == packages.len
// AFTER (fixed)
if (old_resolution >= old.packages.len) continue;
const res = resolutions_of_yore[old_resolution]; // Now safe
```
## Crash Report
From
[bun.report](https://bun.report/1.3.3/wi1274e01cAggkggB+rt/F+pvBiw3rDqul/Doyi4Emzi5Ewj44FuvbgjMog00yDCYKERNEL32.DLLut0LCSntdll.dll4zijBA0eNrzzCtJLcpLzFFILC5OLSrJzM9TSEvMzCktSgUAiSkKPg/view):
```
panic: Internal assertion failure
- lockfile.zig:523: preprocessUpdateRequests
- install_with_manager.zig:605: installWithManager
- updatePackageJSONAndInstall.zig:340
Features: extracted_packages, text_lockfile
```
## Test plan
- [x] `bun run zig:check` passes
- [ ] CI passes
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Skip 2 tests that use `grpctest.kleinsch.com` (domain no longer
exists)
- Fix flaky "should not keep repeating failed resolutions" test
These tests were originally skipped when added in #14286, but were
accidentally un-skipped in #20051. This restores them to match upstream
grpc-node.
## To re-enable these tests in the future
Bun could set up its own DNS TXT record at `*.bun.sh`. According to the
[gRPC A2
spec](https://github.com/grpc/proposal/blob/master/A2-service-configs-in-dns.md):
**DNS Setup needed:**
1. A record: `grpctest.bun.sh` → any valid IP (e.g., `127.0.0.1`)
2. TXT record: `_grpc_config.grpctest.bun.sh` with value:
```
grpc_config=[{"serviceConfig":{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"service":"MyService","method":"Foo"}],"waitForReady":true}]}}]
```
Then update the tests to use `grpctest.bun.sh` instead.
## Test plan
- [x] `bun bd test test/js/third_party/grpc-js/test-resolver.test.ts`
passes (20 pass, 3 skip, 1 todo, 0 fail)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
### What does this PR do?
We can't use globalThis.takeException() because it throws out of memory
error when we instead need to take the exception.
### How did you verify your code works?
## Summary
- Fixed boundary check in `String.zig` to use `>=` instead of `>` for
`max_length()` comparisons
- Strings fail when the length is exactly equal to `max_length()`, not
just when exceeding it
- This affects both `createExternal` and
`createExternalGloballyAllocated` functions
## Test plan
- Existing tests should continue to pass
- Strings with length exactly equal to `max_length()` will now be
properly rejected
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Fixed a typo in `makeComponent` that incorrectly identified
2-character patterns starting with `.` (like `.*`) as `..` (DotBack)
patterns
- The condition checked `pattern[component.start] == '.'` twice instead
of checking both characters at positions 0 and 1
- This caused patterns like `.*/*` to be parsed as `../` + `*`, making
the glob walker traverse into parent directories
Fixes#24936
## Test plan
- [x] Added tests in `test/js/bun/glob/scan.test.ts` that verify
patterns like `.*/*` and `.*/**/*.ts` don't escape the cwd boundary
- [x] Tests fail with system bun (bug reproduced) and pass with the fix
- [x] All existing glob tests pass (169 tests)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
### What does this PR do?
Removes a TODO
### How did you verify your code works?
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## What does this PR do?
Adds missing documentation for features introduced in Bun v1.3.2 and
v1.3.3:
- **Standalone executable config flags**
(`docs/bundler/executables.mdx`): Document
`--no-compile-autoload-dotenv` and `--no-compile-autoload-bunfig` flags
that control automatic config file loading in compiled binaries
- **Test retry/repeats** (`docs/test/writing-tests.mdx`): Document the
`retry` and `repeats` test options for handling flaky tests
- **Disable env file loading**
(`docs/runtime/environment-variables.mdx`): Document `--no-env-file`
flag and `env = false` bunfig option
## How did you verify your code works?
- [x] Verified documentation is accurate against source code
implementation in `src/cli/Arguments.zig`
- [x] Verified features are not already documented elsewhere
- [x] Cross-referenced with v1.3.2 and v1.3.3 release notes
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
### What does this PR do?
Adds [@mschwarzl's Fuzzilli Support
PR](https://github.com/oven-sh/bun/pull/23862) with the changes
necessary to be able to:
- Run it in CI
- Make no impact on `debug` and `release` mode.
### How did you verify your code works?
---------
Co-authored-by: Martin Schwarzl <mschwarzl@cloudflare.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Dylan Conway <dylan.conway567@gmail.com>
### What does this PR do?
This was creating `Zig::FFIFunction` when we could instead use a plain
`JSC::JSFunction`
### How did you verify your code works?
Added a test
### What does this PR do?
`blob.stream(undefined)`
### How did you verify your code works?
Added a test
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
### What does this PR do?
Fixes ENG-21490
### How did you verify your code works?
Added a test that would previously fail due to timeout. It also confirms
the parsed result is correct.
---------
Co-authored-by: taylor.fish <contact@taylor.fish>
### What does this PR do?
Makes sure we are creating error messages with an allocator that will
not `deinit` at the end of function scope on error.
fixes ENG-21528
### How did you verify your code works?
Added a test
### What does this PR do?
We need to call `uv_loop_close` in order to remove the threadlocal loop
from a list in libuv so it won't be used later. This explains the crash
reports because they have `workers_terminated` in features.
Fixes#24804
Closes BUN-3NV
Closes ENG-21523
### How did you verify your code works?
Manually. I'm not sure how to write a test yet other than manually
clicking sleep
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Zack Radisic <zack@theradisic.com>
### What does this PR do?
We must use the right number of properties or we should set it to 0
### How did you verify your code works?
Read the code to check the amount of properties + CI
