Commit a file that lives in a task's output folder, then build. Turborepo
puts the old copy back and calls it FULL TURBO:
$ git log -1 --oneline -- packages/site/out/LICENSE aa424fd v3 $ turbo run build • turbo 2.11.10 • Packages in scope: site • Running build in 1 package • Remote caching disabled site:build: cache hit, replaying logs d02065a43c947846 site:build: $ cat src/*.txt > out/index.txt Tasks: 1 successful, 1 total Cached: 1 cached, 1 total Time: 5ms >>> FULL TURBO $ git diff --stat packages/site/out/LICENSE | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Turborepo 2.11.10 · inputs: ["src/**"], outputs: ["out/**"] · out/LICENSE committed · setup warnings cut · 2026-11-10
out/LICENSE is source. The build never writes it. The cache kept a
copy anyway, and the hit restored it over your commit.
Four of six tools lose the commit
| Case | vx | moon | Turborepo | Nx | Vite Task | Nix |
|---|---|---|---|---|---|---|
| committed edit under the outputs kept | pass | pass | fail | fail | fail | fail |
committed chmod +x under the outputs kept | pass | pass | fail | fail | fail | fail |
| force-added file under ignored outputs kept | pass | pass | fail | fail | fail | fail |
Turborepo 2.11.10 · Nx 24.0.2 · Vite Task 1.4.0 · moon 2.6.5 · Nix 2.34.6 · conformance cases, compiled from the test suites of Nx, Turborepo, Vite Task, moon, Nix and vx
Nix fails another way: it drops LICENSE from the tree. The run stays
green in every tool, so nobody sees it until review.
Where it bites
A CNAME in the site's output folder, a hand-written .d.ts in dist/,
a vendored file in lib/. Each is tracked by git and sits under an
output glob.
vx keys what git tracks under the outputs
The same project under vx, after committing a new out/LICENSE:
$ vx run build --all Tasks status cache ±usual time cpu mem outputs blocks worker task success miss −2ms 7ms 29% — 17B 0 local packages/site#build $ git diff --stat $ cat packages/site/out/LICENSE license v2 vx treats a tracked file under an output glob as part of the key. Your
commit changes the key, the task runs, and LICENSE stays as committed.
Every case and each tool's detail: Conformance.
More at vznjs.github.io/vx.
Originally published on the vx blog. vx is open-source (MIT) task orchestration with a build cache: vznjs.github.io/vx · GitHub.
Written with AI assistance.
