Mimalloc prints warnings when validating pointers to memory-mapped PE sections
(~118MB) during Windows executable compilation. These warnings occur because:
1. mimalloc's heuristics flag large memory regions as suspicious
2. It validates them and confirms they're actually valid
3. The warnings are harmless but noisy and cause test failures
This fix suppresses mimalloc warnings by setting max_warnings=0 during CLI
initialization, while still allowing the MIMALLOC_MAX_WARNINGS environment
variable to override this behavior if needed.
Also update Windows PE tests to filter out these warnings for backward
compatibility with existing debug builds.
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Co-Authored-By: Claude <noreply@anthropic.com>
### What does this PR do?
### How did you verify your code works?
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### What does this PR do?
Setting the background color on plaintext diffs makes the plaintext
harder to read. This is particularly true when the input is longer.
This conservatively makes us only add the background color to the diff
when the characters being highlighted are all whitespaces, punctuation
or non-printable.
This branch:
<img width="748" height="388" alt="image"
src="https://github.com/user-attachments/assets/ceaf02ba-bf71-4207-a319-c041c8a887de"
/>
Canary:
<img width="742" height="404" alt="image"
src="https://github.com/user-attachments/assets/cc380f45-5540-48ed-aea1-07f4b0ab291e"
/>
### How did you verify your code works?
Updated test
## Summary
- Adds `Symbol.asyncIterator` to `process.stdout` and `process.stderr`
when they are TTY or pipe/socket streams
- Matches Node.js behavior where these streams are Duplex-like and
support async iteration
- Does not add the iterator when streams are redirected to files
(matching Node.js SyncWriteStream behavior)
## Test plan
- Added test in
`test/regression/issue/test-process-stdout-async-iterator.test.ts`
- Verified the fix works with Claude Code on Linux x64
- Test passes with `bun bd test
test/regression/issue/test-process-stdout-async-iterator.test.ts`
Fixes#21704🤖 Generated with [Claude Code](https://claude.ai/code)
---------
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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## Summary
- Fix transpiler bug where comma expressions like `(0, obj.method)()`
were incorrectly optimized to `obj.method()`
- This preserved the `this` binding instead of stripping it as per
JavaScript semantics
- Add comprehensive regression test to prevent future issues
## Root Cause
The comma operator optimization in `src/js_parser.zig:7281` was directly
returning the right operand when the left operand had no side effects,
without checking if the expression was being used as a call target.
## Solution
- Added the same `is_call_target` check that other operators (nullish
coalescing, logical OR/AND) use
- When a comma expression is used as a call target AND the right operand
has a value for `this`, preserve the comma expression to strip the
`this` binding
- Follows existing patterns in the codebase for consistent behavior
## Test Plan
- [x] Reproduce the original bug: `(0, obj.method)()` incorrectly
preserved `this`
- [x] Verify fix: comma expressions now correctly strip `this` binding
in function calls
- [x] All existing transpiler tests continue to pass
- [x] Added regression test covering various comma expression scenarios
- [x] Tested edge cases: nested comma expressions, side effects,
different operand types
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Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## Summary
- Updates WebKit from 75f6499 to eb92990 (latest release from
oven-sh/webkit)
- This brings in the latest WebKit improvements and fixes
## Test plan
- [ ] Verify the build completes successfully
- [ ] Run existing test suite to ensure no regressions
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---------
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
### What does this PR do?
Reduce stack space usage of parseSuffix
### 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?
On Linux, AbortSignal.timeout created a file descriptor for each timeout
and did not keep the event loop alive when a timer was active. This is
fixed.
### How did you verify your code works?
Fewer flaky tests
---------
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Co-authored-by: Claude <claude@anthropic.ai>
### What does this PR do?
- Fixes `$.braces(...)` not working properly on non-ascii inputs
- Switches braces code to use `SmallList` to support more deeply nested
brace expansion
---------
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### What does this PR do?
### How did you verify your code works?
---------
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
### What does this PR do?
Fixes a crash related to pipelines
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
## Summary
Fixes a bug in napi_get_value_bigint_words where the function would
return the number of words copied instead of the actual word count
needed when the provided buffer is smaller than required.
## The Problem
When napi_get_value_bigint_words was called with a buffer smaller than
the actual BigInt size, it would incorrectly return the buffer size
instead of the actual word count needed. This doesn't match Node.js
behavior.
### Example
BigInt that requires 2 words: 0x123456789ABCDEF0123456789ABCDEFn
Call with buffer for only 1 word
- Before fix: word_count = 1 (buffer size)
- After fix: word_count = 2 (actual words needed)
## The Fix
Changed napi_get_value_bigint_words to always set word_count to the
actual number of words in the BigInt, regardless of buffer size.
## Test Plan
- Added test test_bigint_word_count that verifies the word count is
correctly returned
- Added test test_ref_unref_underflow for the existing
napi_reference_unref underflow protection
- Both tests pass with the fix and match Node.js behavior
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Co-authored-by: Claude Bot <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>
The crash occurred when resource section resizing caused buffer reallocation,
invalidating pointers to PE structures. Fixed by caching values before resize
and re-getting pointers after resize.
- Cache file_alignment and section_alignment before buffer resize
- Re-get section headers after resize to avoid use-after-free
- Add bounds checking to prevent buffer overflows
- Add sanity check for unreasonably large resource data (>10MB)
- Fix file writing to only write actual PE data, not excess buffer
Fixes crash with ICO files containing 5+ icon sizes that require
resource section expansion.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
Fixes#21189
`.pause()` should unref but it should still continue to emit `readable`
events (although it should not send `data` events)
also stdin.unref() should not pause input, it should only prevent stdin
from keeping the process alive.
DRAFT:
- [x] ~~this causes a bug where `process.stdin.on("readable", () => {});
process.stdin.pause()` will allow the process to exit when it
shouldn't.~~ fixed
---------
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### What does this PR do?
We should not call .deinit() after .toJS otherwise hasPendingActivity
will access invalid memory
### How did you verify your code works?
Test run it with debug build on macos or asan on and will catch it
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
- Fix extra directory level in resource tree (language entry should be data, not subdirectory)
- Rewrite VS_VERSIONINFO generation to match editpe's approach with proper length calculations
- Fix struct padding issue by writing header fields individually (6 bytes, not 8)
- Add proper alignment calculations for all string entries
- Implement correct UTF-16LE string encoding with null terminators
Now all Windows resource options work correctly:
- --windows-version sets file and product version numbers
- --windows-description sets file description
- --windows-publisher sets company name
- --windows-title sets product name
- --windows-copyright sets copyright information
- --windows-hide-console changes subsystem to Windows GUI
All tests pass and exiftool can correctly read the version information.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Fix VersionHeader struct padding issue (was 8 bytes due to alignment, now writes 6 bytes correctly)
- Rewrite UTF-16 string encoding function for correctness
- Write VS_VERSIONINFO header fields individually to avoid struct padding
- Add comprehensive tests using exiftool for verification
- Fix file writing in StandaloneModuleGraph to properly truncate file
The VS_VERSIONINFO structure is now correctly formatted according to the PE specification.
Note: exiftool may have limitations with 64-bit PE files with high virtual addresses.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Fix PE file writing to truncate file before writing to avoid appending data
- Add --windows-copyright option for setting executable copyright information
- Add LegalCopyright field to VS_VERSIONINFO resource structure
- Update tests to verify copyright field is properly written
- Use ASCII copyright string to avoid UTF-16 encoding issues in tests
- Add calculateChecksum() method that implements the standard Windows PE checksum algorithm
- Automatically update checksum after modifying PE files (adding .bun section, applying Windows settings)
- Delete old pe-codesigning-integrity.test.ts that didn't test anything useful
- Add comprehensive checksum verification tests using objdump
The checksum algorithm matches the Windows standard:
- Processes file as 16-bit words
- Skips the checksum field itself
- Handles overflow with carry folding
- Adds file size to final checksum
This test relied on internal APIs that are not exposed. The functionality
is now tested by windows-resources-external-tools.test.ts using external
tools like objdump and strings.
- Add tests using objdump to verify PE headers and resource directories
- Add tests using llvm-objdump to verify sections
- Add tests using hexdump to examine resource data
- Add tests using strings to find UTF-16LE version strings
- Add tests for cross-platform compilation with resources
- Use Bun.which to check tool availability
These tests ensure Windows resource editing works correctly by inspecting
the generated executables with standard system tools rather than relying
only on internal parsing functions.
This PR implements native Windows resource editing in Zig, replacing the previous
rescle C++ implementation. Users can now customize Windows executables when using
'bun build --compile' with the following new options:
- --windows-icon <path> Set custom executable icon
- --windows-title <str> Set executable title/product name
- --windows-publisher <str> Set company/publisher name
- --windows-version <str> Set version (e.g. "1.2.3.4")
- --windows-description <str> Set executable description
- --windows-hide-console Hide console window (already existed)
Example:
```bash
bun build --compile \
--target=bun-windows-x64 \
--windows-icon=app.ico \
--windows-title="My Application" \
--windows-publisher="My Company" \
--windows-version="2.1.0.0" \
--windows-description="A powerful application built with Bun" \
index.ts
```
Implementation details:
- Pure Zig implementation in windows_resources.zig
- Removes C++ rescle dependency
- Creates WindowsSettings struct to organize all Windows options
- Supports cross-platform compilation (build Windows exe from Linux/macOS)
- Fixed alignment issues using safe memory operations
- Comprehensive test coverage in test/bundler/windows-resources-compile.test.ts
This allows full customization of Windows executable metadata without external dependencies.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
### What does this PR do?
Add missing check for .write() on a data-backed blob
### How did you verify your code works?
There is a test
---------
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Co-authored-by: Alistair Smith <hi@alistair.sh>
