fix(env): default to pwsh on Windows instead of bash - #12055
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ChangesEnvironment shell fallback
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The Windows default-shell behavior change is localized, but the current implementation may trigger a warnings-as-errors lint and prevent the required checks from passing; simplify or explicitly validate that conditional before merging. Possibly related PRs
Suggested reviewers: Poem
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Greptile SummaryThe PR changes the default
Confidence Score: 5/5The PR appears safe to merge because no blocking failure remains within the eligible follow-up-review scope. No blocking failure remains. Important Files Changed
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Inline comments:
In `@src/cli/env.rs`:
- Around line 256-259: Replace the Boolean match in the shell-selection logic
with an if/else expression using cfg!(windows), preserving the existing
ShellType::Pwsh and ShellType::Bash branches.
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e2e-win/env_default_shell.Tests.ps1src/cli/env.rs
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`mise env` with no `--shell` prints bash into a PowerShell session. Measured on
2026.8.2 windows-x64:
PS> mise env
export MY_PATH='C:\Users\Jam' # not runnable here
PS> mise env -s pwsh
$Env:MY_PATH='C:\Users\Jam'
Detection is `MISE_SHELL`, then `SHELL`. On unix that always resolves -- an
unset `SHELL` falls back to `sh` -- so the hardcoded fallback below it is
reached only on Windows, where PowerShell and cmd set neither and `COMSPEC`
names cmd.exe, which mise has no implementation for. The fallback was bash.
pwsh is the only shell mise can emit for that a Windows user is likely to be
in. It is not right for a cmd user either, but neither was bash and there is no
third answer available -- `mise env --json`, `--dotenv` and `--values` are the
shell-independent ways out.
Unix is untouched. This is the fallback only: a detected or named shell still
wins, which the tests pin in both directions.
Two existing Windows suites had to be told which shell they meant.
`config_ceiling_paths` and `trusted_config_paths` ran a bare `mise env` and
matched on `export FOO=...`, so they were asserting the Windows default as a
side effect of testing config discovery and trust. They now pass `-s bash`,
which is what they meant and leaves them indifferent to the default.
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What happens
mise envwith no--shellprints bash into a PowerShell session. Measured on 2026.8.2windows-x64, isolated
MISE_*dirs:mise envexists to beeval'd, so a default the caller's shell cannot run is the whole value ofthe command gone.
Why it is Windows-only
Detection is
MISE_SHELL, thenSHELL. On unix that always resolves — an unsetSHELLfalls backto
sh— so the hardcoded fallback under it is effectively dead code there. On Windows PowerShelland cmd set neither variable, and the value mise would otherwise read,
COMSPEC, names cmd.exe,which mise has no implementation for. So the fallback is not a corner on Windows: it is the normal
path, and it was bash.
The change
One line of behaviour in
src/cli/env.rs: the fallback isPwshon Windows,Basheverywhereelse. Unix is untouched. It is still only a fallback — a detected or named shell wins, which the
tests pin in both directions.
Why pwsh, and where it still does not help
pwsh is the only shell mise can emit for that a Windows user is plausibly in. It is not right
for someone in cmd — but neither was bash, and there is no third answer available, because mise has
no cmd shell implementation. Those users want
--json,--dotenvor--values, which is whatthose flags are for.
Options
A — what this PR does. Fallback to pwsh on Windows.
Smallest change; makes the common Windows case work with no flag. Still silently wrong for cmd.
B — error instead, like #12048 does for
activate/hook-env.More consistent: those four commands now say "name the shell" rather than guessing. But
mise envis different in kind — it has shell-independent output modes and a fallback is legitimate — so this
would be a contract change, and on unix it is unreachable, making it a Windows-only breaking change.
C — leave it; require
--shellon Windows.Status quo. Keeps the asymmetry where mise detects for you on unix and silently guesses wrong on
Windows.
I went with A because #12048 already moved the four commands that cannot guess toward saying
so, which leaves
mise envas the one that can guess — and it should guess the shell the platformactually ships.
Not included
The
--shellhelp text does not mention a default. It never did, so leaving it is status quo ratherthan a regression; if you take A I will follow up with the docs, usage spec and man page together.
Tests
e2e-win/env_default_shell.Tests.ps1— withMISE_SHELLandSHELLcleared,mise envemits${Env:…}and noexport. Two controls:mise env -s bashstill emits bash, so this is aboutthe default rather than mise losing the ability to emit bash; and with
MISE_SHELL=bashset,detection still wins over the fallback.
ShellType::PwshonWindows would only restate the
cfg!beside it. What matters is that the syntax is one theplatform's shell can run.
Verification
I did not build locally. I did run the new Pester suite against the released 2026.8.2 binary, which
predates the fix, to check the suite itself is sound rather than passing vacuously:
The failing case is exactly the defect; the two controls already pass. The rest goes to CI.
Related, but independent of this branch: #12048 (those commands panicked instead of erroring) and
#12050 (Windows never read
SHELL, so Git Bash was undetectable).Summary by CodeRabbit
New Features
Bug Fixes