Convert a byte order mark only when the file reader's caller asks, so bundled assets stay byte for byte by robobun · Pull Request #46621 · oven-sh/bun

robobun · 2026-10-23T20:53:43Z

Supersedes #38103.

Problem

bun build rewrites an asset that starts with EF BB BF or FF FE: efbbbf612c620a is emitted as 612c620a, exit code 0. [hash] covers the rewritten bytes.
cache::Fs::read_file_with_allocator (src/resolver/lib.rs:2192) converts a byte order mark in every file. The parse task drops its loader there (src/bundler/ParseTask.rs:1464).

Fix

The reader takes BomHandling: Convert converts once after the read, Keep returns the bytes on disk. The parse task passes Keep for a should_copy_for_bundling() loader.
Two consumers read an asset as text and decode it themselves: fetchSourceCode (native plugins), and a compiled executable that loads an embedded asset as a module.
Verified: test/bundler/bundler_loader.test.ts, native-plugin.test.ts, test/bake/dev/html.test.ts. 8 new tests fail on main.
Self-reviewed: 20 concerns raised, 18 addressed. Not done: a choice after the read (the loader is final before each read), the rest of the shared-buffer deletion (macros: run every macro on one dedicated VM thread #40059, transpiler cache: answer a hit before the parser and its heap are set up #43834 edit it).

Background

A byte order mark names the encoding of a text file. Bun removes it, or transcodes UTF-16LE, so that parsers see UTF-8.
A copy loader (file, wasm, napi, embedded sqlite) emits the bytes of the read.
Considered: a second raw reader (repeats the fd rules), a decode at each text caller (a missed call compiles), Copy file, wasm, napi and sqlite assets byte for byte when they start with a byte order mark #38103 (a second loader list).

Downsides

An asset that starts with a mark gets a new name: bom8-a15rj5tr.csv becomes bom8-e0rxzfpj.csv.
Code that reads it back as UTF-8 now sees U+FEFF, as it does unbundled.
The parse task pays 8 more instructions per file. The read drops from 195 to 170 (text) or 149 (asset).

Notes

Origin and reach. No user reported this. A fuzz run found it. It is old behaviour, not a regression: the rewrite came with #8219 (UTF-16LE source files, v1.0.24), and 1.4.3, 1.4.4 and main 5c6d4e2 emit the same bytes. It needs a file that starts with a mark on a copy loader: text from a Windows tool with an unmapped extension, or an HTML asset such as manifest.json. Images, fonts, wasm, .node and sqlite files do not start with a mark.

Why change it: the bundle and the unbundled run disagree. cfg.dat is EF BB BF {"a":1}, imported with the default file loader, then JSON.parse(readFileSync(path, "utf8")):

Route	main	this branch
`bun app.ts`	starts with U+FEFF, throws	the same
`bun build --compile`, run the executable	mark removed, parses	starts with U+FEFF, throws

Main also disagrees with itself: the same bytes from the in-memory files map, or from an onLoad result with loader: "file", are emitted as they are. esbuild 0.21.5 copies them as they are. The docs say the file loader copies the file "as-is" (docs/bundler/loaders.mdx).

What changed from #38103. Same layer, same enum name, same five call sites.

No Loader::is_binary() and no BomHandling::for_loader: the parse task asks the existing should_copy_for_bundling(), so there is one list of copy loaders.
One conversion step in read_file_with_allocator (Contents::convert_bom) in place of a gate at each of four BOM::detect sites. The read helpers in fs.rs return the bytes of the file.
No seventh argument: BomHandling takes the slot of use_shared_buffer, which was false at every call.
The two text consumers below.

Earlier PRs on the reader's conversion. #33861 (closed) moved the UTF-8 strip out of the reader to each loader. The review there said "This will lead to supporting multiple BOMs". This PR keeps one conversion step per read, in the reader. A file with two marks loses one, as on main. #36334 and #38123 (open) each add a private raw read beside a read_file_with_allocator call because the reader converts. After this PR they can pass BomHandling::Keep.

Text consumer 1: fetchSourceCode. A native plugin reads text, whatever the loader. bun-plugin-tailwind scans every file that is not CSS, and the bun init templates install it.

fetch_source_code reads with Keep and holds the bytes on disk. The plugin gets the text: the same allocation past a UTF-8 mark (the NUL stays after the text), or a transcoded copy for UTF-16LE. In-memory contents are not decoded, as on main.
If the plugin leaves the source unchanged, run continues with the bytes on disk for a loader that copies its file, and with the text for any other loader.
result->loader does not reach the read. The header numbers it differently from the Rust enum (BUN_LOADER_NAPI = 9 is Wasm), and the parse step drops the plugin's write today. bundler: honor the loader chosen by a native onBeforeParse plugin #38172 (open) makes the parse step use that write. It then changes one expression in run (wrapper.loader), and the bytes on disk are still there to convert.

Text consumer 2: an embedded asset that is loaded as a module. In a compiled executable, import(path), require(path) and new Worker(path) of an embedded type: "file" script take the source from the standalone graph, with no read from disk. Main passed only because the bundler had already rewritten the bytes. File::to_wtf_string() now decodes a Binary file the way a read from disk does. Bun.file() and fs reads of the asset stay byte for byte.

Commits. The first commit is the fix and the tests. The second commit deletes what the first leaves without a caller, and changes no behaviour:

the shared-buffer branch of read_file_with_handle_impl (with read_file_with_handle_impl and PathContentsPair: read_file_contents is now the heap read and returns Vec<u8>),
the size_hint argument (always None) and the stream flag of cache::Fs (always false),
From<Cow<[u8]>> for Contents.

The first commit removes BOM::remove_and_convert_to_utf8_without_dealloc, whose one caller was that branch.

Self-review: the 2 concerns that are not done.

Move the parse task's choice from the read to run_with_source_code, where every kind of source has its final loader. On main the loader is final before every disk read, so the move gains nothing for this bug and changes files, onLoad and plugin results that nobody reported. bundler: honor the loader chosen by a native onBeforeParse plugin #38172 is its first real caller.
Delete the rest of the shared-buffer machinery: cache::Fs::shared_buffer, reset_shared_buffer, the swap in jsc_hooks.rs, and the USE_SHARED_BUFFER const generic in transpiler.rs. macros: run every macro on one dedicated VM thread #40059 deletes or edits macro_shared_buffer, use_alternate_source_cache and the two functions. transpiler cache: answer a hit before the parser and its heap are set up #43834 splits parse_maybe_return_file_only_allow_shared_buffer and keeps the const generic. So this PR stops at the reader. None of these had a producer on main: use_shared_buffer was false at every call. The comments that the deletion made false are corrected here. The rest is one follow-up after those two PRs.

A tracking issue was also suggested. There is none: no user reported this, and this description carries the repro.

Other open PRs on these lines. Suggested order: this PR first.

Copy file, wasm, napi and sqlite assets byte for byte when they start with a byte order mark #38103: the same bug. Only one can land. This PR supersedes it. Each case of its tests has a counterpart here, and its repro (EF BB BF hello in a.bin, --loader .bin:file) emits 8 bytes on this branch (5 on a build without the fix, 1.4.3-canary 367d939).
bundler: honor the loader chosen by a native onBeforeParse plugin #38172: see text consumer 1. Its src hunks apply on this branch. Its native-plugin tests need a rebase.
Delete the schema::api mirror types and bun_api; one loader numbering across Rust/C++/JS #37095 gives Rust, C++ and JS one loader numbering.
bundler: hold a copied asset once by moving its read buffer to the output #46492 reads a copy loader's file onto the heap. Both PRs ask should_copy_for_bundling() at the same read: on rebase it can share one local. The plugin read stays Keep, and after this PR the heap read has no BOM code, so a marked asset is adopted without a copy.
Remove dead code from the bundler, the resolver, bun_css, the Valkey client, and six smaller areas #45723 deletes the stream and size_hint lines that the second commit here also deletes. It drops those hunks.
Module loader: read a file with st_size 0 to EOF when it fills the 16 KiB probe #43965 calls finish_arena_contents(arena, buf, total). Here the function takes (buf, total).
macros: run every macro on one dedicated VM thread #40059 and Real lifetimes for Source, import records and resolver results #44493 touch cache::Fs and one comment in transpiler.rs that this PR rewrites.
error printer: never block on, or read from, a file that is not regular #42323 appends an argument at the same five calls.
transpiler cache: answer a hit before the parser and its heap are set up #43834 restructures the runtime parse (begin_parse, finish_parse) and reads a module onto the heap. On rebase its reader call passes BomHandling::Convert where it passes USE_SHARED_BUFFER today.
Embed files named by new URL(relative, import.meta.url) in bun build --compile #45393 and bundler: embed files referenced via new URL(..., import.meta.url) in --compile #44702 give new URL(rel, import.meta.url) files the file loader under --compile. That sends .json, .txt and .css files through this copy read, so this PR should land first.

Not changed.

Text from the files map or an onLoad plugin is not decoded (U+FEFF stays, UTF-16LE is not transcoded). Disk and memory now agree for copy loaders and still differ for text.
XML: src/parsers/xml.rs decodes its own input and notes that the reader converts first. XML output is the same on both builds.
bun build --no-bundle copies an asset entry point fd to fd and does not use this reader.
A mark needs 3 bytes to be detected, FF FE also matches a UTF-32LE mark, and UTF-16BE is not detected. That rule is unchanged for text.

Tests. 14 new tests. On a release build of main 5c6d4e2, 8 fail and 6 pass. On this branch all pass (release, and debug with ASAN).

Fail on main: file (selected by an import attribute, by the loader option, and by default for an extension with no loader), wasm, napi and embedded sqlite through the CLI and the API (8 byte samples each, with the output names checked against an in-memory files build), a run with BUN_FEATURE_FLAG_FORCE_IO_POOL=1, --compile, an HTML icon and <img>, an inlined CSS url(), the dev server, and a native plugin that fetches a file asset and keeps it.
The --compile test also imports a .txt in both encodings, and loads two embedded scripts with import() and new Worker(): UTF-16LE, and a UTF-8 mark before #!. Those rows pass on main and fail without text consumer 2.
The native plugin test asserts that the plugin received decoded text with a NUL after it. That fails without text consumer 1.
Pass on main too (main had no test for a mark in package.json, tsconfig.json or a --no-bundle CSS entry, and none for UTF-16LE at any caller): bundled and runtime imports of js, json and text, under and over the 16 KiB first read, a package.json (main), a tsconfig.json (paths), a --no-bundle CSS entry, and a text import that a native plugin fetches.

Measurements. Release builds on one machine: main 5c6d4e2 and this branch. Tools: gdb 16.3 (a stepi trace of one call, breakpoints, catch syscall), nm, objdump, size. strace, perf, valgrind and bloaty are not installed, and the machine has no package mirror.

read_file_with_allocator, own instructions with callees excluded, 3 identical runs each: a runtime module read with no mark 195 -> 170, a bundled text module 195 -> 170, a bundled type: "file" asset 195 -> 149.
Stack-argument stores before each of the 8 calls of read_file_with_allocator (objdump): 9, 4, 4, 3, 9, 3, 3, 4 in both builds.
Parse task, per file from disk: get_code_for_parse_task_without_plugins 94 -> 96 own instructions (stepi), 1326 -> 1335 bytes. Its caller has 6 more instructions before the call (objdump, 34 -> 40).
A native plugin fetch with no mark: fetch_source_code 63 -> 108 own instructions, its read 195 -> 149. The sum is 258 -> 257.
Release .text (size): 107,635,854 -> 107,634,318 bytes (-1,536). read_file_with_allocator 5100 -> 2949 bytes. finish_arena_contents (349 bytes) and BOM::remove_and_convert_to_utf8_without_dealloc (275 bytes) are gone. The conversion is a cold function of 495 bytes. fetch_source_code 251 -> 465 bytes. BOM::detect sites in the reader: 4 -> 1.
File syscalls with no mark (catch syscall on open, openat, read, pread64, fstat, newfstatat, statx, lseek, close): a build of 220 assets and 200 TS modules 2210 = 2210. A script that requires 5000 CommonJS modules 20120 = 20120 in most runs of each build (one run of main had 20123, one of this branch 20124).
Allocator calls in the reader per read with no mark: 1 = 1.
A 20003-byte FF FE asset paid 1 heap allocation, 1 transcode, 1 arena allocation, copies of 20003 and 30000 bytes and a 30001-byte fill in the reader. Now none. An EF BB BF asset paid a 20000-byte move. Now none.
Text that is still converted: a 1 MiB JS module with a UTF-8 mark paid a 1,048,600-byte move, now none (the slice starts after the mark), for 26 more instructions (228 -> 254). A 40 KB UTF-16LE module paid copies of 40050 and 20024 bytes and a 20025-byte fill, now one 20024-byte copy, for 17 more instructions (265 -> 282).
Output names of the reported repro: bom8-a15rj5tr.csv -> bom8-e0rxzfpj.csv, fffe-smv08aep.bin -> fffe-zrq6xvr9.bin, control-9qx5fna3.bin unchanged. The new names are the names an in-memory files build gives the same bytes.
Text differential between the two builds: package.json, tsconfig.json, a --no-bundle CSS entry, and runtime and bundled imports of js, json and text. EF BB BF and UTF-16LE after FF FE, at 7, 16382, 16383, 16384, 16385 and 20003 bytes, and a file that is only EF BB BF. 143 runs (stdout, stderr, exit code) and 58 emitted files: 0 differ.

Suites.

Debug build with ASAN: bundler_loader 73 pass, native-plugin 21 pass 1 skip, bake/dev/html 16 pass, bundler_compile 85 pass, bundler_plugin 68 pass, bundler_files, bundler_html, resolve and xml pass.
Release build of this branch: cli 43 pass 2 skip, bundler_compile 85 pass, source-positions 325 pass, bundler_loader 73 pass, native-plugin 22 pass.
On the debug build, 3 tests of cli.test.ts time out at 5 s (two --compile tests and __dirname and __filename). They pass on the release build.

no test proof · iteration 1 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/bundler/native-plugin.test.ts

`cache::Fs::read_file_with_allocator` stripped a UTF-8 byte order mark and transcoded UTF-16LE to UTF-8 in every file it read. The bundler emits the bytes of that read as the asset of a `file`, `wasm`, `napi` or embedded `sqlite` import. An asset that starts with `EF BB BF` or `FF FE` was therefore not a copy of the file, and `[hash]` covered the rewritten bytes. The reader now takes a `BomHandling`. `Convert` runs one conversion step after the read. `Keep` returns the bytes on disk. The parse task asks for `Keep` when `Loader::should_copy_for_bundling()` is true. Two consumers read such a file as text, and decode it themselves: - `fetchSourceCode` gives a native plugin the text, as before. The bundler keeps the bytes on disk for a copied file that the plugin leaves unchanged. - A compiled executable decodes an embedded file asset when it loads the asset as a module. `BomHandling` takes the place of `use_shared_buffer`, which was `false` at every call. `BOM::remove_and_convert_to_utf8_without_dealloc` had one caller, in the shared-buffer read, and is removed.

`read_file_with_allocator` no longer takes `use_shared_buffer`, so the shared-buffer branch of `read_file_with_handle_impl` has no caller. `read_file_contents` is now the heap read itself and returns `Vec<u8>`. Removed with it: `read_file_with_handle_impl`, `PathContentsPair`, the `size_hint` argument (always `None`), the `stream` flag of `cache::Fs` (always `false`) and `From<Cow<[u8]>> for Contents`. Comments that described the shared-buffer read now describe what is left.

robobun · 2026-10-23T20:54:01Z

^{Updated 1:14 AM PT - Oct 27th, 2026}

❌ @robobun, your commit ec853dd has 1 failures in Build #133480 (All Failures):

step failed outside runner - exit 1 on 🍎 any aarch64 - test-bun

🧪 To try this PR locally:

bunx bun-pr 46621

That installs a local version of the PR into your bun-46621 executable, so you can run:

bun-46621 --bun

robobun · 2026-10-23T20:54:03Z

Status: the diff is green, and the PR waits for a maintainer review.

CI passed on 1175cd1 (Buildkite build #133212).
The branch now contains main 8a0e49e (merge b376693). The merge changes one comment line of the patch and no code.
On the merge, builds #133469 and #133480 have one red job: darwin any aarch64 - test-bun, one of two shards. It stops before any test runs: buildkite-agent artifact download timed out after 120s for step 'darwin-aarch64-build-bun'. The CI machine that ran it fails the same way on other pull requests.
The other 180 jobs of build #133480 passed. A retry of the red job is what is missing.

How I reproduced it: three files imported with with { type: "file" }, then bun build ./src/e.ts --outdir out --target bun.

File	Source bytes	Emitted on main `5c6d4e2`	Emitted on this branch
`control.bin`	`01efbbbffffe`	`01efbbbffffe`	`01efbbbffffe`
`bom8.csv`	`efbbbf612c620a`	`612c620a`	`efbbbf612c620a`
`fffe.bin`	`fffe4100d8d809`	`41efbfbd`	`fffe4100d8d809`

Both builds exit with code 0. The same inputs are in test/bundler/bundler_loader.test.ts (inputs that start with a byte order mark). On a release build of main, 8 of the 14 new tests fail. On this branch all pass.

coderabbitai · 2026-10-23T21:02:27Z

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Files selected for processing: 5

src/bundler/ParseTask.rs
src/bundler/transpiler.rs
src/resolver/lib.rs
src/resolver/package_json.rs
src/resolver/resolver.rs

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Walkthrough

File reads now use explicit BOM handling to convert text or preserve source bytes. Bundler and standalone paths apply these behaviors. Tests cover decoding and byte-for-byte asset preservation.

Changes

BOM-aware file reading and consumers

Layer / File(s)	Summary
Filesystem reading and BOM conversion `src/bun_core/string/immutable/unicode.rs`, `src/resolver/fs.rs`, `src/resolver/lib.rs`, `src/resolver/package_json.rs`, `src/resolver/resolver.rs`	Filesystem reads now use `BomHandling::Convert` or `BomHandling::Keep`. `Contents` converts UTF-8 and UTF-16LE BOM-prefixed data when requested. Package JSON and tsconfig reads request conversion.
Bundler and standalone BOM handling `src/bundler/ParseTask.rs`, `src/bundler/transpiler.rs`, `src/standalone_graph/StandaloneModuleGraph.rs`	Bundler loaders select whether to preserve original bytes or convert text. Plugin source handling retains original contents and selects returned contents based on the loader. Binary standalone content now handles BOMs.
BOM behavior validation `test/bundler/bundler_loader.test.ts`, `test/bundler/native-plugin.test.ts`, `test/bundler/native_plugin.cc`, `test/bake/dev/html.test.ts`	Tests check decoded text and byte-for-byte preservation across bundler loaders, native plugins, and dev-server asset responses.

Possibly related PRs

oven-sh/bun#46688: Adds BOM-aware decoding for JSON and text-like results from file-backed Bun.file() values returned by macros.

Suggested reviewers: jarred-sumner, alii, dylan-conway

Priority: Normal

Merge Risk: Minimal · up to ec853

File assets retain their bytes while text reads decode BOMs. No merge-blocking risk is established.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly summarizes the main change: callers control BOM conversion so bundled assets preserve their original bytes.
Description check		The description explains the problem, implementation, scope, trade-offs, and verification results. It does not use the exact template headings, but it provides the required information in equivalent s…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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coderabbitai

Actionable comments posted: 1

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Inline comments:
Review comments at @src/resolver/fs.rs:
- Around line 843-858: Update the buffer-tail handling around file.read_all so
the read is limited to the remaining content capacity and the NUL terminator is
written immediately after the bytes actually read. Keep the terminator within
the buffer at buf[total], including when the file grows between size calculation
and reading.

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📒 Files selected for processing: 12

src/bun_core/string/immutable/unicode.rs
src/bundler/ParseTask.rs
src/bundler/transpiler.rs
src/resolver/fs.rs
src/resolver/lib.rs
src/resolver/package_json.rs
src/resolver/resolver.rs
src/standalone_graph/StandaloneModuleGraph.rs
test/bake/dev/html.test.ts
test/bundler/bundler_loader.test.ts
test/bundler/native-plugin.test.ts
test/bundler/native_plugin.cc

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claude

Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.

Beyond the inline findings, I also checked the two Contents values the native-plugin path now holds (original_contents and the BOM-offset original_text): both are Contents::Arena with a no-op drop and the UTF-8 case points into the same arena allocation, so there is no double free or dangling slice. The Owned fallthrough in convert_detected_bom is unreachable on the ParseTask path since read_arena is always Some(bump), and the empty-file heap read's Vec::new() still maps to Contents::Empty via From<Vec<u8>>.

Extended reasoning...

The change reworks BOM handling in the resolver/bundler file-read cache (src/resolver/lib.rs, src/resolver/fs.rs), ParseTask's native-plugin fetch path, and StandaloneModuleGraph's module text decoding, with unsafe arena pointer arithmetic; it touches no auth, crypto or injection surface. Two inline findings (a serial test and leftover shared-buffer fields) are posted; this note records the ownership and reachability checks that were ruled out so a human reviewer need not repeat them.

claude

Code review found no issues

No high-confidence issues detected in this change.

Still open from earlier reviews (1):

Unresolved: 1 minor or pre-existing.

… line

claude

Code review found no issues

No high-confidence issues detected in this change.

…he byte order mark tests The copy tests selected the file loader with an import attribute only. They now also cover a .txt file that the loader option maps to file, and an extension that has no loader.

claude

Code review found no issues

No high-confidence issues detected in this change.

robobun · 2026-10-27T04:58:28Z

Merged main (8a0e49e) into this branch.

One conflict, in a comment in src/bundler/transpiler.rs. Main (98a4365, Fix use-after-free of BuildMessage.position.file: real lifetimes for Source, Path, ImportRecord and resolve results #46834) deleted the sentence about Source.contents: &'static [u8]. This PR rewrote the sentence after it. The resolution keeps the sentence of this PR and leaves out the one that main deleted. No code changed.
The patch of the PR has the same size as before the merge (12 files, +603 -383).
cargo check --workspace passes on the merged tree (Linux x64).
Tests, on a local debug build that contains this merge and the main merges of eight other open PRs, with --timeout 30000: test/bundler/bundler_loader.test.ts (73 pass), test/bundler/native-plugin.test.ts (21 pass, 1 skip), test/bake/dev/html.test.ts (16 pass).

claude

Code review found no issues

No high-confidence issues detected in this change.

robobun added 2 commits October 23, 2026 20:44

robobun assigned Jarred-Sumner Oct 23, 2026

github-actions Bot added the claude label Oct 23, 2026

coderabbitai Bot reviewed Oct 23, 2026

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Comment thread src/resolver/fs.rs Resolved

claude Bot reviewed Oct 23, 2026

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Comment thread test/bundler/bundler_loader.test.ts Resolved

Comment thread src/resolver/lib.rs Resolved

test: run the IO pool byte order mark test with its concurrent siblings

3f4c232