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Without --outdir, a build that produced more than one file (a linked
source map is the usual second file) fell back to dirname(entry) as the
output directory. `bun build src/x.js --sourcemap` wrote the bundle over
src/x.js, and `--outfile dist/app.js --sourcemap` wrote into src/ too.
- Bare `--sourcemap` now means linked when the build writes to disk and
inline when it prints to stdout, the same rule as
`Bun.build({ sourcemap: true })` and esbuild.
- `--sourcemap=linked` and `--sourcemap=external` without --outdir or
--outfile are an error. External already was; it is now allowed with
--outfile.
- Without --outdir, `--outfile dir/app.js` is handed to the bundler as
outdir=dir with the entry named app.js, so the bundle, its .map and
the map's `sources` are all relative to dir.
- The dirname(entry) fallback is removed.
Fixes #19729
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| Layer / File(s) | Summary |
|---|---|
Sourcemap defaults and validation src/runtime/cli/Arguments.rs, src/runtime/cli/build_command.rs, docs/bundler/*.mdx, test/bundler/cli.test.ts |
Valueless --sourcemap selects linked for disk output and inline for stdout. Stdout builds reject linked and external maps. Documentation and tests cover sourcemap modes, output requirements, and map-write failures. |
Entry-point filename handling src/bundler/options.rs, src/bundler/linker_context/computeChunks.rs, src/bundler/transpiler.rs, src/runtime/api/js_bundle_completion_task.rs, src/runtime/cli/build_command.rs |
entry_point_file_name replaces compile_entry_point_name. The bundler and transpiler use the configured filename for entry-point output. |
Outfile routing and validation src/runtime/cli/build_command.rs, test/bundler/cli.test.ts, test/bundler/bundler_promiseall_deadcode.test.ts |
Build setup uses the outfile basename and directory to route output. Tests cover literal outfile names, output placement, error cases, and updated source-map debugId values. |
Suggested reviewers: jarred-sumner
Severity of issue fixed: Medium
Merge Risk: 
357e9
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No merge-blocking issue is established for the selected test changes. Merge readiness remains subject to normal checks.
Pre-merge checks: 
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Check name Status Explanation Title check The title clearly summarizes the main change: preventing Bun from deriving the output directory from the entry point. Linked Issues check Issue #19729requires--outfile=dist/index.js --sourcemapto write the bundle and source map indist/.parse_build_command_optionsselects linked maps when--outfileis present. `BuildCommand:…Out of Scope Changes check The changes stay within build output paths, source-map modes, outfile naming, and related regression coverage. The documentation, bundler naming changes, HTML and --no-bundlecases, write-order test…Description check The description clearly explains the problem, implementation, behavior changes, risks, and verification results. It does not use the template headings exactly, but the Problem/Fix sections cover what … Full details: Linked Issues check
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Explanation
Issue
#19729requires--outfile=dist/index.js --sourcemapto write the bundle and source map indist/.parse_build_command_optionsselects linked maps when--outfileis present.BuildCommand::execsets the outfile directory asoutput_dirand passes the literal basename asentry_point_file_name. The CLI tests verify bundle and map placement and verify that the entry files remain unchanged.
Full details: Out of Scope Changes check
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Explanation
The changes stay within build output paths, source-map modes, outfile naming, and related regression coverage. The documentation, bundler naming changes, HTML and
--no-bundlecases, write-order test, and CLI tests support the output-path correction. No unrelated change is demonstrated.
Full details: Description check
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Explanation
The description clearly explains the problem, implementation, behavior changes, risks, and verification results. It does not use the template headings exactly, but the Problem/Fix sections cover what the PR does and the Tests section provides detailed verification evidence.
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Status: ready for review. The branch has Reproduced on bun 1.4.3 (and per the reports 1.3.14 and 1.4.2): mkdir -p src work && printf 'export function hello(){ return "hello" }\nconsole.log(hello())\n' > src/x.js
cd work
bun build ../src/x.js --sourcemap # prints a two-file summary, exit 0
ls ../src # x.js x.js.map, and x.js is now the bundle
cd .. && bun build ./src/x.js --outfile dist/x.js --sourcemap
ls dist # No such file or directory; src/x.js was replaced againWith this branch the first command prints the bundle with an inline map and writes nothing, the second writes The earlier head of this branch (571bea5) had a fault of its own. It passed the mkdir -p src && echo 'console.log("app")' > src/app.js
bun build src/app.js --outfile 'dist/[name].js' && ls dist # app.js, not [name].js ([hash].js gave 59f42an9.js)
cd src && bun build app.js --outfile '[name].js' # replaced app.js with its bundle828064d takes the name as written. Bun 1.4.3, main and esbuild do the same for these two commands. Test:
mkdir app.js.map && echo 'OLD BUNDLE' > app.js && echo 'console.log(1)' > entry.js
bun build entry.js --outfile app.js --sourcemap=linked; head -1 app.js
# bun 1.4.3: the bundle is replaced, then the map fails (EISDIR). This branch: the map fails first, app.js is still OLD BUNDLE.Test: The merge of CI on 4e01f5e (build 136458): this PR's own tests pass on every lane, |
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I reviewed this PR and didn't find any bugs. Because it changes a user-facing default (bare --sourcemap → inline vs linked) and restructures where bun build decides to write files on disk — the very path whose old behavior overwrote source files — a human look at the --outfile → output_dir move and the removed dirname(entry) fallback would still be worthwhile.
What was reviewed:
- Arg-parse ordering in Arguments.rs —
compile/outdir/outfileare set before--sourcemapis read, sowrites_to_disksees the right values. - The moved outfile block now writes
this_transpiler.options.output_dir(notctx.bundler_options.outdir); confirmedopt_output_diris snapshotted from that field afterward, so the write path and thesources-relative-to-outdir logic both pick it up. - Test suite: covers the linked/external/inline/none × stdout/
--outfile/--compilematrix, asserts the negative contract (source tree byte-identical), normalizes\for Windows, drains pipes concurrently.
Extended reasoning...
Overview
This PR fixes a data-loss-adjacent bug in bun build: when --sourcemap produced a second output file and no --outdir was set, the CLI fell back to dirname(entry_points[0]) as the write root, so the bundle and its .map landed in the user's source directory — overwriting the entry when basenames matched. The fix has three parts: (1) bare --sourcemap now resolves to inline when output goes to stdout and linked only when writing to disk, matching Bun.build({ sourcemap: true }) and esbuild; (2) --outfile dir/app.js is translated into output_dir = dir + entry_naming = ./app.js before the bundler runs (excluding --compile and --no-bundle), so the bundler itself writes the map next to the outfile with correct sources paths; (3) the dirname(entry) fallback in the post-bundle writer is removed outright. Docs and a 9-case concurrent test suite in test/bundler/cli.test.ts ship alongside.
Security risks
None in the traditional sense — no auth, crypto, or untrusted-input parsing. The relevant risk is correctness of file-write destinations: the old code could clobber user source files, and any regression here would do the same. The removed fallback and the earlier output_dir assignment are the load-bearing changes; I traced that opt_output_dir (the snapshot the writer reads) is taken from this_transpiler.options.output_dir after the new block sets it, so the writer sees the outfile's directory rather than empty. The stdout guard now rejects both linked and external before any write can happen.
Level of scrutiny
Medium-high. The diff is not large (~120 net LOC across two Rust files plus tests/docs), but it restructures control flow in BuildCommand::exec — moving a block from after the bundle to before it, and deleting a fallback that other multi-output-without-outdir shapes could conceivably have relied on. The PR description enumerates the unchanged cases (--no-bundle --outfile, --compile --outfile dir/app, --outfile with an asset import, multiple entries, /dev/stdout, --metafile, hashbang exec bit, watch mode), and the author reports running the adjacent test files, but a maintainer who knows this writer's history (issues #8697, #19729, and the two superseded PRs) is better placed to confirm nothing else leaned on the removed root_path = dirname(entry) line.
Other factors
The change also flips a default: bun build src/x.js --sourcemap used to (buggily) write files and now prints an inline map to stdout. That's the correct fix and matches esbuild, but it's a user-visible behavior change worth a maintainer's sign-off. Test quality is high — describe.concurrent, tempDir with using, output asserted before exit code, source tree diffed byte-for-byte after every case, Windows path separators normalized. No CODEOWNERS cover the touched paths, and the timeline shows no prior human review to defer to or block on.
…file rows without a leading .. (Windows mkdir of ../x is a separate bug)
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Actionable comments posted: 2
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Inline comments:
In `@docs/bundler/esbuild.mdx`:
- Line 51: Update the sourcemap documentation to state that explicit linked and
external modes require an output location via --outdir or --outfile. In
docs/bundler/esbuild.mdx lines 51-51, add this requirement for both modes; in
docs/bundler/index.mdx lines 761-761, add it to the external row.
In `@test/bundler/cli.test.ts`:
- Around line 426-443: In the test cases at test/bundler/cli.test.ts lines
426-443 and 459-464, assert subprocess stdout and stderr first, then move
expect(exitCode).toBe(0) before tree(), bundle/map, and other generated-file
assertions so failures preserve the subprocess diagnostic; update both affected
sites.
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#42006 is stacked on this branch. It drops the standalone HTML |
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This would fix a real downstream case for us. tosijs-schema's release build (pinned to Bun 1.4.2) builds a subpath entry with We work around it with |
…d-sourcemap-no-outdir
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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 two things and ruled them out: the bare --sourcemap resolution in src/runtime/cli/Arguments.rs reads compile/outdir/outfile that are all parsed earlier in parse_build_command_options, so the writes_to_disk branch is live; and the --no-bundle --outfile dir/x.js write path in build_command.rs is behavior-preserving (a single in-memory file already went to dirname(outfile) before the will_be_one_file gate was dropped), though it has no test anywhere in the suite.
Extended reasoning...
The change touches CLI argument parsing and the build output writer in src/runtime/cli, plus docs and a new test block in test/bundler/cli.test.ts; it touches no security-sensitive surface. Two inline findings are posted (a pre-existing in-place overwrite for standalone HTML builds run from the entry's directory, and an error-message formatting nit); this note only records the additional paths examined and ruled out this run.
…undle --outfile in a directory
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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 that dropping the ctx.bundler_options.outdir mutation does not affect --watch --outfile: rebuilds run inside generate_from_cli on the same transpiler, so the output_dir set at build_command.rs:438 persists across rebuilds. The --compile --outfile dir/app path is unchanged: the new block excludes compile, so its output still stays in memory and lands in dirname(outfile) via the writer at build_command.rs:813-825 as before.
Extended reasoning...
The change reworks bun build source-map defaults and --outfile output-directory handling in src/runtime/cli/Arguments.rs and src/runtime/cli/build_command.rs, with docs and a new cli.test.ts block; no security-sensitive surface. Two confirmed inline findings (the --no-bundle --sourcemap=linked stdout regression and the error-wording change for an --outfile parent that is a file) already signal that a human look is needed, so this body only records the watch-mode and --compile paths that were traced and found unaffected.
`--outfile 'dist/[name].js'` wrote `dist/app.js`. The basename went into `entry_naming`, which is a path template, so `[name]`, `[hash]`, `[dir]`, `[ext]` and `[target]` in it were expanded. The basename now reaches the bundler as `entry_point_file_name`, the option that `--compile` already used (renamed from `compile_entry_point_name`). `compute_chunks` gives the one output file the template `./[name]` with the name as the placeholder value. The `--no-bundle` namer returns the name directly, so the CLI no longer renames an output file after the build. - Released Bun expanded the name in one case: `--outfile` with a linked source map (the rename was skipped for two outputs, and the files went next to the entry). For a templated name, use `--outdir <dir> --entry-naming '<name>'`. - `--outfile /` has no file name. It is an error before the build starts. - `--outfile` with a second output that takes the entry naming (the CSS of a JS entry, or the page of a `--target=bun` or `--target=node` entry that imports an `.html` file) still exits 1 and writes nothing. The message is now `cannot write multiple output files without an output directory`. - The debugId of an `--outfile` build with a source map changes once: the chunk hash read the file name as its template, and no longer does.
…d-sourcemap-no-outdir
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline finding, I checked the new entry_point_file_name path added in the latest commits: the takes_entry_naming closure in computeChunks.rs is the old condition verbatim, so the second site is unchanged; Bun.build only sets the name when compile_mode is Executable (standalone HTML clears config.compile first in js_bundle_completion_task.rs), so the non-executable branch is reached only from the CLI --outfile block; sync_resolver_opts() at build_command.rs:550 runs after the new output_dir assignment at line 444, so the linker's root path sees dirname(outfile); and --outdir/--outfile/--compile are parsed before --sourcemap in Arguments.rs, so the bare-flag default sees them.
Extended reasoning...
The change reworks how bun build resolves the output directory and file name for --outfile and bare --sourcemap, touching the CLI argument parser, build_command.rs, the linker's chunk naming, and the transpiler's --no-bundle naming, with no security-sensitive surface. It is a deliberate breaking behavior change in the bundler with one verified finding going unposted, so a human maintainer should weigh the design rather than this review approving it.
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A note for the rebase: #47306 (stacked on #46655) touches the same #47306 moves the condition that this PR names For the PR that lands second:
Keeping the closure compiles too, but it leaves two copies of the rule. Neither PR needs to wait for the other. |
With --outfile the bundler writes the files itself, map first, as it does for --outdir. A reader that reloads when the bundle changes (bun --hot) never finds the new bundle beside the map of the build before. The rows observe the order through a map path that cannot be written: the build fails there and the old bundle stays.
…d-sourcemap-no-outdir
The default of a bare --sourcemap reads three options: --compile, --outdir and --outfile. The --outdir state had no row.
Fixes #19729
Problem
bun build src/app.js --sourcemap, with or without--outfile dist/app.js, writes the bundle and its map intosrc/, over the entry, and exits 0.--outdir,BuildCommand::exec(build_command.rs) wrote two or more files (bundle and map) intodirname(entry_points[0]).Fix
--outfile dir/app.jsreaches the bundler asoutput_dir = dirplus the literal file nameapp.js(entry_point_file_name, from compile: name the entry point's chunk after the outfile, so other chunks can load it #41264, no placeholders). The bundle, its map, and the map'ssourcesfollowdir. The fallback is removed.--sourcemapislinkedwhen files are written andinlineon stdout, like esbuild.linked/externalto stdout is an error.test/bundler/cli.test.ts, 21 fail on bun 1.4.3-canary. Self-reviewed: 5 concerns, 5 addressed.Background
bun buildprints to stdout.linkedandexternalmaps are separate files.--entry-namingis a template: the linker fills[name],[hash],[dir],[ext]and[target]for each output file.linkedonly (bun build: reject --sourcemap=linked without --outdir or --outfile #38676, keeps the fallback),dirname(outfile)in the writer (bun build: honor --outfile directory when --sourcemap is set #30884,sourcesstay cwd-relative), an escape syntax (changes the--entry-naminggrammar).Downsides
bun build src/x.ts --sourcemapprints the bundle with an inline map. It no longer writessrc/x.jsand its map. Use--outdir.--outfile 'x.[hash].js'with a linked map expanded the name. It is now literal. Use--outdir <dir> --entry-naming 'x.[hash].js'.--outfile: mapsourcesare relative to its directory,debugIdchanges once, +3 syscalls per build (136 to 139). Release code: -4 bytes.Notes
Behaviour changes, for the release note (before / after; entry in
src/, no--outdir):bun build src/x.js --sourcemap: wrotesrc/x.js+src/x.js.map/ prints the bundle with an inline map, writes nothing.bun build src/x.js --sourcemap=linked: same as 1 / exits 1:--sourcemap=externalprintedcannot use an external source map without --outdirand now prints the same two lines withan external.--outfile dist/js/app.js --sourcemap[=linked]: wroteapp.js+app.js.mapintosrc// writes them intodist/js/.--outfile dist/js/app.js --sourcemap=external: error / writesdist/js/app.js(debugId only) +dist/js/app.js.map.--outfile dir/x.js(inline too):sourceswere relative to the cwd / are relative todir(../../src/entry.jsfordist/js/), as with--outdir.src/index.html --compile --target=browser --sourcemap: wroteindex.html+ the chunk map intosrc/, over the entry / writes them into the cwd.--outfile 'x.[hash].js' --sourcemap[=linked], and a standalone HTML build with--sourcemap:[name],[hash],[ext],[dir]and[target]in the name were expanded and the files went next to the entry. It was the only--outfilebuild that expanded them / the name is written as typed, indirname(outfile), as it always was without a map. For a templated name use--outdir <dir> --entry-naming 'x.[hash].js': forbundle.[hash].jsit writes the same file names and the same bytes (cmp) as the old--outfilespelling did. The same change stopscd src && bun build app.js --outfile '[name].js' --sourcemapfrom replacingapp.jswith its bundle.--no-bundle --sourcemap=linkedto stdout now gets the error of 2 (--no-bundleemits no map yet, bun build --no-bundle: honor --sourcemap #41939 adds that). The error text for an output directory that cannot be created now comes from the bundler (Failed to create output directory ...).--outfile /(a path with no file name): failed when the file was written / fails before the build witherror: --outfile "/" does not name a file.--outfilewith a second output that takes the entry naming (the CSS of a JS entry, or the page of a--target=bun/--target=nodeentry that imports an.htmlfile): exit 1 withMultiple files share the same output pathand aconsider adding '[hash]'note / exit 1 withcannot write multiple output files without an output directory. Nothing is written, before and after. The old text named the two inputs. If that list is wanted back, it can be anote:on the new message.debugIdof an--outfilebuild with a source map depended on the outfile name / it changes once and is the same for every name. No other output byte changes.--outdirbuilds keep their id.--metafilewith--outfile 'dist/[name].js': theoutputskey was./app.jsfor a file named[name].js/ the key is./[name].js.--outfilewith a linked or external map: the bundle was written first, then the map / the map is written first, as with--outdir. If the map cannot be written, the build fails there and the old bundle stays.Unchanged:
--outfile app.jswithout a map,--no-bundle --outfile,--compile --outfile dir/app [--sourcemap](also with[name]in the name),--outdir,--outfile /dev/stdout, the--metafilepath (cwd-relative), the executable bit on hashbang bundles,--outfilewith an asset import (cannot write multiple output files without an output directory), several entries with--outfile(Must use --outdir),--outfilewith--entry-naming(the outfile wins),--outdirwith--outfile(the outfile is ignored).The
--outfilename (last commit).entry_naming. Sobun build src/app.js --outfile 'dist/[name].js'wrotedist/app.js([hash].jsgave59f42an9.js,[dir].jsgave..js,[ext].jsgavejs.js,[target].jsgavebrowser.js), andcd src && bun build app.js --outfile '[name].js'replaced the entry. Main has the same assignment, but for a single output file the CLI renamed the file afterwards.BuildCommand::execsetsentry_point_file_name. Incompute_chunksthe first chunk that takes the entry naming gets the template./[name]with the name as the placeholder value, and a value is not scanned again. A build that succeeds with--outfilehas one such chunk: the JS chunk, the CSS chunk, or the page of a standalone HTML build.--compilekeeps its rule for the chunk (the server-side entry point).--no-bundle --outfilewas already literal, through a rename in the CLI.Transpiler::transform_only_dest_pathnow returns the name and the rename is deleted. No test fails without this half. It is in this commit because bun build --no-bundle: honor --sourcemap #41939 addsentry_naming = "./" + basename(outfile)for--no-bundle, and that line would bring the expansion back there.BundleOptions::for_workerdoes not copy the name. Only the parent transpiler names output files.Cost measurement, first version. Two debug builds of this branch's tree, A with
main'sArguments.rsandbuild_command.rs, B with this PR's.strace -f -c, file-related syscalls only (open, mkdir, read, write, close, stat, rename, unlink and relatives), a two-module project, 3 runs each, all runs identical:bun build src/entry.js(stdout)... --outfile app.js... --outfile dist/js/app.js... --outdir dist... --outdir dist --sourcemap=linkedThe 3 extra calls are
mkdirat(<outdir>, ".")(EEXIST) from the bundler's writer, and a secondopenat+closeof the output directory from the CLI's summary block. Every--outdirbuild already makes the same calls.straceis not in the dev image, so 6.12 was built from its release tarball.Cost measurement, last commit. The head before the commit (571bea5) against the commit, debug builds,
GOMAXPROCS=2, 3 runs each, all runs equal. Calls of the Rust allocator entry points, counted with gdb breakpoints (alloc / realloc / free):bun build src/app.js(stdout)... --outdir out... --outfile dist/plain.js... --no-bundle --outdir out... --no-bundle --outfile dist/app.js... --compile --outfile dist/appcatch syscall: open, openat, read, write, close, the stat family, readlink, mkdir, access): the same count before and after for the stdout,--outdir,--outfile,--outfilewith a linked map and--no-bundle --outfilerows.--outfile 'dist/[dir].js'goes from 116 to 113, because the name no longer asks for the directory of the entry.sizeof):PathTemplate104 B,Chunk816 B,BundleOptions1648 B, before and after.src/files of this PR at the merge base against the PR: 5 functions change size, net -4 bytes (BuildCommand::exec-216,Transpiler::for_worker-146,parse_build_command_options+36,Transpiler::transform+84,compute_chunks+238). The.textsection is 80,718,949 bytes and the binary is 106,125,032 bytes in both.bloaty,straceandperfare not in the dev image:size,nm -Sand gdb were used.--outfilebuilds (a JS, a CSS and a standalone HTML entry; no map, linked, external, inline; with and without--metafile), before and after the commit: 14 are byte-identical. The 6 JS rows with a map differ only indebugId. The 4 HTML rows with a metafile differ only in the key order of the metafileinputs, and that order also differs between two runs of one binary (see Related).Tests. 43 rows of
test/bundler/cli.test.ts: 11 for #19729 and the--sourcemapdefault, 30 for the name, 2 for the write order (item 13). On bun 1.4.3-canary 21 fail (8, 11 and 2). On this PR before the last commit 23 of the 30 name rows fail. TwodebugIdpins inbundler_promiseall_deadcode.test.tsmoved (item 11). The pin incyclic-imports-async-bundler.test.jsdid not.Suites run on a debug build of this branch with
main(6292c65) merged:cli,bundler_naming,bundler_promiseall_deadcode,cyclic-imports-async-bundler,metafile,standalone,bundler_loader,bundler_string,bundler_jsx,bundler_html,bundler_html_server,html-import-manifest,bundler_splitting,bundler_edgecase,esbuild/css,esbuild/default,bun-build-compile-sourcemap, and the entry point naming rows ofbundler_compile_splitting. Before the merge also:bundler_minify,bundler_minify_symbol_for,esbuild/metafile,esbuild/loader,regression/issue/09559,22003, and the sourcemap rows oftest/cli/hot/hot.test.ts.The only failures are rows that need more than the 5 s default timeout with the 1.1 GB debug binary: three
--compilerows incli.test.tsanddefault/TopLevelAwaitForbiddenRequireSourceMapCLI(40 builds). They time out on a build without this PR's last commit too, and the--compilerows pass with a longer timeout. No row tests--compile --outfile 'dist/[name]', because each such row copies the debug binary. Checked by hand: the name is literal on 1.4.3-canary, before the last commit, and after it.On the merge 00023af, debug build:
cli.test.ts(86 pass, 2 skip),bundler_promiseall_deadcode.test.ts,test/cli/compile/compile-library.test.ts(56 pass; one row needs more than its 60 s in a debug build and passes alone in 44 s),test/cli/check/specifiers-in-declarations.test.ts,test/cli/aot-check-and-build-flags.test.ts,test/cli/aot-unknown-flags.test.ts,test/cli/aot-options-without-effect.test.ts, and the 54aot::optionsunit tests ofbun_bundler.Self-review. First version: the
--outfilebasename reaches the bundler byte-exact, not through a lossy UTF-8 display (addressed). Item 8 was accepted. Last commit, 5 concerns, 5 addressed: item 7 is stated with its replacement and pinned by two rows next to the entry; item 10 is stated for its class and pinned for a server entry that imports a page;--no-bundle --outfile /has a row; the doc comment of the option is one line; #41939 and #42006 have a note about the rebase.Related.
dirname(entry)fallback) and bun build: honor --outfile directory when --sourcemap is set #30884 (dirname(outfile)in the writer only). Both are closed.--compileascompile_entry_point_name. This PR renames it and gives it to--outfile.outfile = basename(entry)) from replacingindex.htmlwhen the build runs in the entry's own directory. It removes the default that the rowwith a standalone html build of [ext].htmlpins, so that row changes there.--no-bundlesource maps) setsentry_naming = "./" + basename(outfile)in its--no-bundleblock. After this PR the namer readsentry_point_file_namefirst, so that line can go when it rebases.outfilefield toBundleOptions. It overlaps withentry_point_file_name.mainat 00023af.main'sbun build --compile --aotcode (Compile TypeScript to machine code ahead of time:bun build --compile --aot#45631, AOT: bun test --aot on large suites, module loading fixes, fuzzer fixes #47316) used the old namecompile_entry_point_namein 4 places:src/runtime/cli/compile_command/configuration.rs,src/bundler/aot/options.rs(2) and its tests. They now useentry_point_file_name. The AOT path only runs for--compile, where the option means what it meant before.<file>.mapwhose debugId is not the debug id of the file #47628 compares thedebugIdof a bundle and its map, forbun build --watch --outfilebesidebun --hot, where a reload could load the new bundle beside the old map. Item 13 removes that order for--outfile. Seen with a directory watcher:app.js.mapappears beforeapp.json this head, the same as--outdir. On bun 1.4.3-canaryapp.jsappears first.--outfile(item 10). esbuild 0.21.5 writesout.jsandout.cssfor it. Not changed here.--sourcemapto stdout is inline,--sourcemap=linked/=externalto stdout isCannot use an external source map without an output path,--outfile=dist/app.js --sourcemap[=external]writesdist/app.js+dist/app.js.map, and--outfile='dist/[name].js'writesdist/[name].js...(--outdir ../out,--outfile ../out/app.js) fails with ENOENT before and after this change. That is a separate defect in the Windows recursive mkdir. The--outfilerows usedist/js/entry.jsfrom the project root for that reason.inputsdiffers between runs for an HTML entry with a CSS@importand a JS import (about 8 of 30 runs).bun build --no-bundleof a.wasmorfile-loader entry ignores--outfileand--outdirand writes<entry>-<hash>.<ext>next to the entry.no test proof · iteration 7 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/bundler/cli.test.ts