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…ipt's `npm run` `bun run` takes `-w, --workspace <value>`, before the script name. The value selects the workspace packages that npm selects for it: the package with that name, the package in that folder, and the packages directly inside that folder. The matching follows the four tests of npm's lib/utils/get-workspaces.js, in `select_packages`, where the names and the folders of the workspace packages are known. The rewrite of `npm run` in a package.json script now passes the value of `-w` / `--workspace` on as `-w <value>`, or `-w=<value>` where the script has the `=`. Before, it wrote `--filter=<value>`, and `--filter` reads a word without a leading dot as a package name. So `npm run build -w client` failed with `No workspace packages matched the filter "client"` when `client` was the folder of a package with another name. A run with `--workspace` follows npm in these points. The packages run one after another, in the order of the flags. `--workspaces` adds no packages. A run that selects nothing fails, also with `--if-present`. A package that a value selects must have the script, unless `--if-present` is set. With `--filter`, a value counts as one more positive pattern. The argument parser gets a rule per command for a param of a shared table. `bun run` refuses a value that is glued to `-w`, because npm reads `-ws` as `--workspaces`. bun as `node` does not have the flag. `pnpm run -w` is no longer rewritten to `bun run -w`: pnpm's `-w` is `--workspace-root`.
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Updated 9:03 PM PT - Oct 21st, 2026
✅ @robobun, your commit 0bc74ce87520fb6b1b6ad7cd0d35734ac48647ca passed in 🧪 To try this PR locally: bunx bun-pr 46401That installs a local version of the PR into your bun-46401 --bun |
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Status Reproduced on a debug build of main with this fixture:
With this PR, PR: #46401 |
Walkthrough
ChangesWorkspace Run Support
Suggested reviewers: Priority: ➖ Normal Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly summarizes the main change: adding npm's --workspace support to bun run and using it when rewriting npm run -w commands. |
| Description check | |
The description is comprehensive and covers the problem, fix, behavior, limitations, verification, tests, compatibility decisions, and performance impact. It does not use the exact template headings, … |
| 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. |
Full details: Description check
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Explanation
The description is comprehensive and covers the problem, fix, behavior, limitations, verification, tests, compatibility decisions, and performance impact. It does not use the exact template headings, but it provides the required information in equivalent sections.
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Actionable comments posted: 3
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/install/lifecycle_script_runner.rs:
- Line 229: Update the option check in the command-rewriting logic to recognize
both pnpm workspace-root spellings, `-w` and `--workspace-root`, so commands
using either form remain unchanged; keep the existing behavior for other
arguments.
Review comments at @src/runtime/cli/filter_run.rs:
- Line 864: Update the collection loop around require_scripts to skip the entire
workspace when ctx.if_present is enabled and pkgscripts does not contain
script_name, preventing pre- and post-lifecycle hooks from running without the
requested script. Preserve normal processing when the script exists or
if_present is disabled.
Review comments at @test/cli/install/bun-run.test.ts:
- Line 797: Replace the new parameterized it.each() cases with a describe.each()
group, and place a regular test for each case inside that group. Preserve the
existing case data and assertions while following the parameterized-test
convention required by the surrounding test scope.
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review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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docs/guides/install/from-npm-install-to-bun-install.mdxdocs/pm/filter.mdxdocs/runtime/index.mdxdocs/snippets/cli/run.mdxsrc/clap/comptime.rssrc/clap/lib.rssrc/clap/streaming.rssrc/install/PackageManager/workspace_selection.rssrc/install/lifecycle_script_runner.rssrc/options_types/context.rssrc/runtime/cli/Arguments.rssrc/runtime/cli/filter_arg.rssrc/runtime/cli/filter_run.rssrc/runtime/cli/multi_run.rstest/cli/install/bun-run.test.tstest/cli/run/filter-workspace.test.tstest/cli/run/workspaces.test.ts
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| if strings::has_prefix_comptime(&script[start..], b"pnpm run ") | ||
| && !strings::tokenize_any(&script[start + b"pnpm run ".len()..], b" \t") | ||
| .take_while(|word| word[0] == b'-') | ||
| .any(|word| word == b"-w") |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
Keep pnpm run --workspace-root unchanged.
If a script uses pnpm run --workspace-root build, this check misses pnpm’s long form of -w. The command becomes bun run --workspace-root build, although Bun does not provide pnpm’s workspace-root option. Check both spellings before rewriting. Add the long form to the passthrough test. (pnpm.io)
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Review comment at @src/install/lifecycle_script_runner.rs at line 229:
Update the option check in the command-rewriting logic to recognize both pnpm
workspace-root spellings, `-w` and `--workspace-root`, so commands using either
form remain unchanged; keep the existing behavior for other arguments.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
| &mut this_transpiler.resolver, | ||
| fsinstance.top_level_dir(), | ||
| )?; | ||
| selected.require_scripts(&*ctx, &[script_name]); |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
🔎 Supported by static analysis
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printf '%s\n' '--- if-present workspace tests and implementation references ---'
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Skip the lifecycle chain when --if-present skips the requested script.
require_scripts returns early when ctx.if_present is enabled, but the collection loop still processes pre<name> and post<name> independently. A selected workspace without build can therefore run a lifecycle hook and produce a nonzero overall exit status. The later workspace script still runs, so the failure does not prevent b from running.
Suggested fix
let Some(pkgscripts) = &package.json.scripts else {
continue;
};
+ if ctx.if_present && pkgscripts.get(script_name).is_none() {
+ continue;
+ }
let run_in_bun = ctx.debug.run_in_bun;🤖 Prompt for AI Agents
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Review comment at @src/runtime/cli/filter_run.rs at line 864:
Update the collection loop around require_scripts to skip the entire workspace
when ctx.if_present is enabled and pkgscripts does not contain script_name,
preventing pre- and post-lifecycle hooks from running without the requested
script. Preserve normal processing when the script exists or if_present is
disabled.
After applying the fix, consider running `coderabbit review --agent` for local
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|
|
||
| // Each command that runs a script rewrites it. `apps/app` has the script | ||
| // `cd ../.. && npm run build -w client`. Only bun's runner prints the name of the package. | ||
| it.each([ |
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📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win
🔎 Supported by static analysis
🏁 Script executed:
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git diff --unified=12 e53cd3d99485e70a9f2f50846e622d48f9605f4d 0bc74ce87520fb6b1b6ad7cd0d35734ac48647ca -- test/cli/install/bun-run.test.tsRepository: oven-sh/bun
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Use describe.each() for the new parameterized cases.
test/AGENTS.md requires describe.each() for parameterized tests. The new it.each() at line 797 is within that scope. Move the cases into a describe.each() group and run each case in a test inside that group.
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only still-valid issues, skip the rest with a brief reason, keep changes
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Review comment at @test/cli/install/bun-run.test.ts at line 797:
Replace the new parameterized it.each() cases with a describe.each() group, and
place a regular test for each case inside that group. Preserve the existing case
data and assertions while following the parameterized-test convention required
by the surrounding test scope.
After applying the fix, consider running `coderabbit review --agent` for local
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Beyond the inline findings, I also checked the shared clap parser change in src/clap/streaming.rs: every new branch is gated on param_rules, which is empty for every command except run and run-as-node, so the other commands' parsing is unchanged. The --if-present exit 1 on an empty --workspace selection and the in-given-order (non-dependency) run order match the PR's stated npm-parity intent rather than being oversights.
Extended reasoning...
The change adds an npm-compatible -w/--workspace flag to bun run, threads a ParamRule table through the shared clap parser, rewrites filters to a PackageFilter enum, and changes the npm run -w script rewrite to emit -w; it touches no auth, crypto, or data-exposure surface. Four confirmed findings are posted inline (older-bun-on-PATH breakage of the rewrite, untranslated -ws and --workspace-root, duplicate runs for overlapping workspaces entries), so a human look is already signaled; this note only records what else was ruled out.
| // The short flag: a `bun` in `PATH` from before the flag refuses `-w`, but skips `--workspace` and runs this package's script. | ||
| flags.extend_from_slice(b" -w"); |
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🔴 Scripts containing npm run <s> -w <pkg> now exit 1 with error: Invalid Argument '-w' whenever an older bun answers to bun on PATH; base's --filter= rewrite ran there. src/install/lifecycle_script_runner.rs:318 writes -w, and path_for_run (src/runtime/cli/run_command.rs:2015) adds the running bun's shim dir only when no node is on PATH, so a pinned bun devDependency in node_modules/.bin, or a system bun ahead of ~/.bun/bin, parses the line. Fix: emit a spelling every bun honors, such as --filter=<base text> --workspace=<value> (old bun honors --filter and skips the unknown long flag; new bun dedupes the pair). The PR's note that no release has the --filter= rewrite holds against releases, not against base.
Why this was flagged
A package.json script reads npm run hello -w app and the project also has bun pinned in devDependencies, or a system bun older than the one the user invokes sits earlier on PATH; node is installed. The user runs the new bun: bun run start. append_npm_run_in_workspaces at src/install/lifecycle_script_runner.rs:318-320 rewrites the line to bun run -w app hello. RunCommand::path_for_run (src/runtime/cli/run_command.rs:2015) prepends the bun-node shim dir, which holds a bun link to the running binary, only when force_using_bun || !found_node; with node on PATH it prepends node_modules/.bin dirs ahead of the original PATH, so bun resolves to the older binary. That binary has no -w short in RUN_TABLE and reaches src/clap/streaming.rs:321, printing error: Invalid Argument '-w' and exiting 1 before any script runs. On the base branch the same helper wrote --filter=app, which every released bun parses, so the script ran in app.
Verification: src/install/lifecycle_script_runner.rs:318-320 now emits -w + separator + value (base emitted --filter= + value). src/runtime/cli/run_command.rs:2015 only prepends the bun-node shim dir when node is absent, so bun resolves to whatever older bun sits there. An older bun's clap refuses an unknown short flag with error: Invalid Argument '-w' (src/clap/lib.rs:340), exiting 1.
| let (workspace, separator): (Option<&[u8]>, &[u8]) = match token { | ||
| b"-w" | b"--workspace" => (tokens.next(), b" "), | ||
| b"--workspaces" | b"--ws" => { |
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🟣 pre-existing, not blocking: pre-existing: a script line npm run build -ws (npm's short alias of --workspaces) is still not translated, so bun run runs only the current package's script, exit 0, while npm runs every workspace. The token match at src/install/lifecycle_script_runner.rs:278-280 handles -w, --workspace, --workspaces and --ws but not -ws, so -ws lands in rest and is handed to the script as an argument. Fix: treat -ws like --workspaces in this match (and -ws before the script name, which otherwise becomes bun run -ws build and fails with Invalid Argument '-ws'), so every npm spelling of the flag is rewritten.
A small fix can ride a push you are already making; otherwise a short reply is enough.
Why this was flagged
A package.json script such as "start": "npm run build -ws" (npm documents -ws as the alias of --workspaces) is run with bun run start, which rewrites it through replace_package_manager_run at src/install/lifecycle_script_runner.rs:201-211. append_npm_run_in_workspaces matches b"--workspaces" | b"--ws" at src/install/lifecycle_script_runner.rs:280 but has no arm for b"-ws", so the token goes to rest at src/install/lifecycle_script_runner.rs:302-303 and selects_workspaces stays false; the helper returns 0 and the line becomes bun run build -ws. bun run stops after the script name, so -ws is passed to the root's build script and only the root runs, exit 0; npm runs build in every workspace. The base branch has the same gap (it produced Invalid Argument '-w' there), so this is pre-existing; the diff reworks this match for -w and documents the -ws spelling in test/cli/run/workspaces.test.ts:301 without covering it in the helper.
Verification: pre-existing — triggered when a package.json script contains npm run <script> -ws. The match at src/install/lifecycle_script_runner.rs:278-306 has no arm for -ws, so it is pushed to rest (302-303), producing bun run build -ws, which runs only the current package's script, whereas npm runs the script in every workspace. The base already fails the same way by the same route.
| // pnpm's `-w` is `--workspace-root`. `bun run` has npm's `-w`, which takes a value. | ||
| if strings::has_prefix_comptime(&script[start..], b"pnpm run ") | ||
| && !strings::tokenize_any(&script[start + b"pnpm run ".len()..], b" \t") | ||
| .take_while(|word| word[0] == b'-') | ||
| .any(|word| word == b"-w") | ||
| { |
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🟣 pre-existing, not blocking: nit, pre-existing: a script line pnpm run --workspace-root build is still rewritten to bun run --workspace-root build, which runs the current package's script instead of the root's. The new guard at src/install/lifecycle_script_runner.rs:227 only recognises the short spelling -w of pnpm's flag, so the long form keeps the old wrong rewrite. Fix: leave pnpm run alone for every spelling of pnpm's workspace-root flag (-w and --workspace-root), the same way the guard now does for -w.
A small fix can ride a push you are already making; otherwise a short reply is enough.
Why this was flagged
A package.json script reads pnpm run --workspace-root build and bun runs it (bun run, bun install lifecycle). replace_package_manager_run at src/install/lifecycle_script_runner.rs:226 matches the pnpm run prefix and the new token scan at :227-229 only looks for the exact word -w, so --workspace-root passes and the line becomes bun run --workspace-root build. bun run skips an unknown long flag, so the build script of the current package runs rather than the root package's, with no error. The base branch behaves the same for this spelling; the diff fixes only the -w spelling, which the new bun run -w would otherwise reject with Invalid Argument.
Verification: pre-existing. Triggering condition: a package.json script that reads pnpm run --workspace-root <script> and is run by bun. The new guard at src/install/lifecycle_script_runner.rs:226-229 excludes only the exact token -w, so pnpm run --workspace-root build still takes the rewrite branch and becomes bun run --workspace-root build. The base already fails the same way, so this is not newly introduced.
| package_json_path, | ||
| json, | ||
| workspace_value: None, | ||
| entry: iter.pattern_idx, |
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🟣 pre-existing, not blocking: With workspaces: ["packages/*", "packages/a"], bun run -w packages build runs a's build twice, one after the other, and prints two a entries; npm runs it once. PackageFilterIterator yields the same package.json once per matching entry (filter_arg.rs:599-617) and discovery at filter_arg.rs:225-231 pushes both, so select_npm_workspaces marks both copies and in_given_order sorts them adjacent (filter_arg.rs:343). Fix: dedupe discovered packages by package_json_path before selection so every selector (--filter, --workspace, --workspaces) runs a package once.
A small fix can ride a push you are already making; otherwise a short reply is enough.
Why this was flagged
A root package.json lists a glob and a literal path that overlap, a common way to pin ordering. bun run -w packages build or the rewritten npm run build -w packages walks packages/*/package.json and packages/a/package.json (filter_arg.rs:599-617), pushes a twice (filter_arg.rs:225-231), and select_npm_workspaces gives both copies a workspace_value. The sort at filter_arg.rs:343 puts them next to each other; filter_run.rs:1118 then sets follows_previous for the second copy because the package_json_path is equal, so when the first build fails the second copy prints a build: Skipped, and when it succeeds the build runs twice in sequence (doubling build time for that package). npm's map-workspaces keys by name and runs once. The base ran duplicates concurrently under --filter, so the finder called it pre-existing, but the new sequential --workspace mode and the new npm-parity contract make the doubled run visible on every such repo. Remedy: dedupe discovered by package_json_path.
Verification: Triggering condition: a root workspaces array with overlapping entries (e.g. ["packages/*", "packages/a"]) and bun run -w packages build. The discovery loop (src/runtime/cli/filter_arg.rs lines 205-232) pushes a WorkspacePackage per yielded path; nothing dedupes, so a's build runs twice. The base has the same undeduped discovery, so --filter a already runs a twice on main.
Problem
npm run build -w clientfails whenclientis a folder and not a package name. The error iserror: No workspace packages matched the filter "client". npm runs it.npm runtobun run. The helper (src/install/lifecycle_script_runner.rs:311) wrote--filter=<value>, and--filterreads a bare word as a package name.Fix
bun runtakes npm's-w, --workspace <value>: a package name, its folder, or the parent folder.select_packages(src/runtime/cli/filter_arg.rs) ports the four tests of npm'slib/utils/get-workspaces.js.-w <value>.test/cli/run/workspaces.test.tsandtest/cli/install/bun-run.test.ts(77 tests fail on main). npm 11.16.0 agrees on 100/100 pairs of one fixture (main: 80).Background
bun runthat it starts knows the workspace's names and folders.--filter, Bun's pattern grammar for nine commands, does not change.bun run --workspace#2232 ask for the flag. Considered: three--filterguesses, which warn on every working script. Also a wider bare--filterword (cli: match unscoped name and directory basename in--filter#36656), which changes a documented grammar.Downsides
bun run build -w clientstill passes-w clientto the script.bunonPATHwithout the flag refuses the rewritten line (Invalid Argument '-w'). No release has main's--filter=rewrite.bun runstart: +278 of 2.2 M instructions, +1realloccall.bun <file>: none. Binary: +8,192 B.Notes
Before and after (debug builds of main at 6f58f6b without and with this change, npm 11.16.0 as the reference). In the fixture, the folder
clientholds@scope/web, andpackages/bhas the nameclient.npm run build -w clientpackages/bonly. Exit 1 when no package has that namenpm run build -w packages,-w ./packages,-w packages/aandbaandbnpm run build -w /abs/path/client,-w @org/d(a folder)npm run build -w ./client --workspacesclientclientnpm run build -w shared -w app(appreads whatsharedbuilds)appfailsnpm run build -w nope --if-presentnpm run build --workspace={a,b}-w={a,b})pnpm run -w buildbun run -w build:Invalid Argument '-w'What
bun run -w <value>doesworkspaces, then by path. A failure does not stop the next package, and the run exits non-zero.--if-presentis set. If not, the run fails before a script starts:Script "build" not found in package "x". npm runs the other packages first and then exits 1.error: No workspace packages matched --workspace "x", exit 1, also with--if-present. A value that selects nothing next to one that selects: onewarn:line. npm prints nothing there.--filter, a value is one more positive pattern. A!pattern takes packages away from it. A package that only--filterselects may lack the script, as before.--workspacesadds no packages to the ones that--workspaceselects.-wsand-wclientstay errors (Invalid Argument '-ws'): npm reads-wsas--workspaces. bun asnodeand barebundo not have the flag.Where the result differs from npm
--filter. From a folder that is not a member, npm reportsNo workspaces foundand bun selects. From a member that has its ownworkspaces, bun stops at that member.nameis selected by its path only. npm also takes its folder name...that stands for a parent folder (-w client/..) selects nothing. A backslash in a value is a separator on POSIX too.Decisions a maintainer may overrule
-w. It is npm's. pnpm's-wis--workspace-root, and -w (workspace) flag to run bun at the workspace/monorepo root #17466 asks for that meaning on other commands. The rewrite needs a spelling that a bun without the flag refuses. Such a bun skips an unknown--workspace=xin silence and runs the script of the current package.--filterand--workspacesstart packages at the same time, in dependency order. A selection of only--workspacevalues runs in npm's order.--workspacesdoes the same on main.bun. Therebun -w fmtisbun fmt -w. The table of barebunalso feeds theprocess.execArgvparser and the flag list of the package manager commands. The cost there would be small: one 72-byte table row.Not changed by this PR
bun run build -w client, andbun run dev --workspace=backend(the command of Bun does not support workspaces #16005).npm runinside quotes. The same holds in a command with$, a parenthesis, a backslash or#. Example:concurrently "npm run dev -w a" "npm run dev -w b". A flag in front of the script name now works there, becausebun runreads it. run: read--prefixand-Cof a script'snpm runas--cwd#46289 makes the helper read a quoted command.npm -w a run build,npm test -w a,npm exec -w a: not rewritten.bun run --ws, barebun --workspace=a build: the unknown long flag is skipped and the script of the current package runs.bun install|add|remove|update --workspace a: ignored on purpose since install: fix regressions since 1.4.3 and resolve peer dependencies more like pnpm #45898.--include-workspace-rootis not translated.runcompletions list neither--filternor--workspaces, and CLI: fixes for bun run, flags, bunfig.toml, .env, --filter, bun init and completions #46007 rewrites these files.In flight on the same files
-s,--silentand-wsof a script'snpm run#45874 edits the same helper, and run: read--prefixand-Cof a script'snpm runas--cwd#46289 is stacked on it (--prefix, a quotednpm run). Their new rows expect--filter=appand--filter=other. The PR that lands second re-types those rows to-w.Arguments.rs. Keep both.select_packages. run --filter, publish -r: keep the dependency order around a dependency cycle #46205 and Append non-UTF-8 bytes instead of formatting them: run --filter output, build names, CSS module hash, shell which #46157 touchfilter_run.rs.workspaceto--filterat the argv level. After this PR it can pass the flag through.If a release is tagged from main first
main's
--filter=<name>rewrite would then be released. A bun without the flag refuses the-wthat this PR writes, where that release ran a name value. The helper would then write--filter=<main's text> --workspace=<value>, andselect_packageswould drop the warning for the filter that repeats a matched value.Measurements (release builds of main at 6f58f6b without and with this change, linux-x64)
bun run noop: 3,089,945 -> 3,090,226 instructions (+281).bun run nope: +278.instructions:uthroughperf_event_open, ASLR off, 5 runs, spread under 150. Argument parsing: +0 allocations, +1realloccall (gdb breakpoints on the mimalloc entry points).bun ./nope.js: -60,bun nope: -90,bun --revision: -33,bun install --help: -164. These paths get no new work..rodata.startup: +0 B (8,488 B in both linker maps).bun -e 0: 4.23 M, the noise of 15,000 hides any delta..text+10,752 B:select_packages+6,162,require_scripts+740,arguments::parse+562. Thebun runflag table: +72 B.size_of::<ContextData>(): 2032 -> 2032.select_packagesmakes the same allocator calls as main for--filter=pkg-a,--filter=./packages/aand--workspaces. The counts are 191 / 7 / 159, 191 / 7 / 159 and 190 / 7 / 114 (alloc / realloc / free).-w pkg-amakes 200 / 7 / 168, which is 9 more than the--filter=pkg-athat main ran.straceis not installed, so system calls are not counted.bun run -w V build(18 of 18 lines) andbun run -w=V build(5 of 5) witherror: Invalid Argument '-w', exit 1.bun run --workspace=client buildon 1.4.3 runs the root's script, exit 0.nodewith-w V x.js(exit 1) and--workspace=V x.js(runs),bun x -w,bun -w fmt. Changed text, same exit code:bun run -ws buildnames-wsand not-w.Tests
test/cli/run/workspaces.test.ts: 65 new rows. The selection and order rows were checked againstnpm run build -w ...of npm 11.16.0 on the same fixture (33 rows).test/cli/install/bun-run.test.ts: 10 of 13 pinned rewrite strings re-typed (7 to-w V, 3 to-w=V), 8 new rows. Threenot.toContain("--filter")guards became positive checks of the unmoved text, because the rewritten text has no--filterto look for.test/cli/run/filter-workspace.test.ts: one[run]bunfig row.workspaces.test.ts, 18 of the 41 tests in the touched blocks ofbun-run.test.ts, and the bunfig row. The long-path row came after that run. It fails on a bun without the flag (Invalid Argument '-w'). The rows that pass on main pin what does not change.multi-run,if-present,as-node,run_command,run-eval,test/cli/bun.test.ts, the flag tests ofbun-installandbunx.cargo clippyon the four crates,cargo miri test -p bun_clap(with the newparam_rulesunit test), andtest/internal/source-lints/.Self-review
41 concerns raised, 36 addressed. The first version of this change had four wrong results. It ran every package for
-w packages --filter '!pkg-b'. It ran several values at the same time. It split--workspace={a,b}into a value and a script name. It turnedpnpm run -w buildintobun run -w build. Not taken:workspace_selection.rs: onlybun runhas a value of this kind.npm runin the helper: left for after run: read-s,--silentand-wsof a script'snpm run#45874.--wsforbun runand--workspacefor barebun: separate decisions.