fix(shell): pass literal pattern when glob matches no files

[robobun]

Summary

• When a glob pattern doesn't match any files, pass the literal pattern to the command instead of erroring with "no matches found"
• This matches bash's default behavior (vs zsh's failglob)
• Scripts like rimraf dist/* now work when dist directory doesn't exist

Test plan

• Added regression test for issue bun: no matches found: dist/* #26317
• Updated existing glob expansion test to expect new behavior
• Verified fix passes with bun bd test
• Verified tests fail with USE_SYSTEM_BUN=1 (before fix)

Fixes #26317

🤖 Generated with Claude Code

[robobun]

^{Updated 9:30 PM PT - Jan 20th, 2026}

❌ Your commit adc9c945 has 1 failures in Build #35470 (All Failures):

• CMakeLists.txt - cmake error on 🍎 aarch64 - build-bun
• CMakeLists.txt - cmake error on 🍎 aarch64 - build-bun
• CMakeLists.txt - cmake error on 🍎 aarch64 - build-bun
• CMakeLists.txt - cmake error on 🍎 aarch64 - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🐧 x64 - build-bun
• CMakeLists.txt - cmake error on 🐧 x64 - build-bun
• CMakeLists.txt - cmake error on 🐧 x64 - build-bun
• CMakeLists.txt - cmake error on 🐧 x64 - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-musl - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-musl - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-musl - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-musl - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-musl-baseline - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-musl-baseline - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-musl-baseline - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-musl-baseline - build-bun
• CMakeLists.txt - cmake error on 🐧 aarch64 - build-bun
• CMakeLists.txt - cmake error on 🐧 aarch64 - build-bun
• CMakeLists.txt - cmake error on 🐧 aarch64 - build-bun
• CMakeLists.txt - cmake error on 🐧 aarch64 - build-bun
• CMakeLists.txt - cmake error on 🐧 aarch64-musl - build-bun
• CMakeLists.txt - cmake error on 🐧 aarch64-musl - build-bun
• CMakeLists.txt - cmake error on 🐧 aarch64-musl - build-bun
• CMakeLists.txt - cmake error on 🐧 aarch64-musl - build-bun
• CMakeLists.txt - cmake error on 🍎 x64 - build-bun
• CMakeLists.txt - cmake error on 🍎 x64 - build-bun
• CMakeLists.txt - cmake error on 🍎 x64 - build-bun
• CMakeLists.txt - cmake error on 🍎 x64 - build-bun
• cmake/tools/SetupBuildkite.cmake - cmake error on 🪟 x64 - build-bun
• cmake/tools/SetupBuildkite.cmake - cmake error on 🪟 x64 - build-bun
• cmake/tools/SetupBuildkite.cmake - cmake error on 🪟 x64-baseline - build-bun
• cmake/tools/SetupBuildkite.cmake - cmake error on 🪟 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🪟 x64 - build-bun
• CMakeLists.txt - cmake error on 🪟 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🪟 x64 - build-bun
• CMakeLists.txt - cmake error on 🪟 x64-baseline - build-bun
• cmake/tools/SetupBuildkite.cmake - cmake error on 🪟 x64 - build-bun
• cmake/tools/SetupBuildkite.cmake - cmake error on 🪟 x64 - build-bun
• cmake/tools/SetupBuildkite.cmake - cmake error on 🪟 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🪟 x64 - build-bun
• cmake/tools/SetupBuildkite.cmake - cmake error on 🪟 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🪟 x64 - build-bun
• CMakeLists.txt - cmake error on 🪟 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🪟 x64-baseline - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-asan - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-asan - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-asan - build-bun
• CMakeLists.txt - cmake error on 🐧 x64-asan - build-bun

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🧪   To try this PR locally:

bunx bun-pr 26318

That installs a local version of the PR into your bun-26318 executable, so you can run:

bun-26318 --bun

[coderabbitai]

Walkthrough

Glob expansion behavior when patterns match no files is modified. Previously, the system would error on zero matches; now it consistently passes the literal pattern through. The implementation, existing tests, and regression test are updated to reflect this behavior change.

Changes

Cohort / File(s)	Summary
Core shell expansion logic src/shell/states/Expansion.zig	Modified onGlobWalkDone to always pass the literal pattern to output when glob yields zero matches, instead of conditionally returning an error. Implements bash-like pass-through behavior for non-matching globs.
Test updates test/js/bun/shell/bunshell.test.ts, test/regression/issue/26317.test.ts	Updated glob expansion test expectations from fail (exit code 1) to pass (exit code 0 with literal pattern). Added new regression test for issue #26317 validating that unmatched globs pass literal patterns rather than error.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title 'fix(shell): pass literal pattern when glob matches no files' is concise and clearly summarizes the main change in the codebase - addressing how glob patterns with no matches are handled.
Description check	✅ Passed	The PR description adequately covers both required template sections with clear summary, test plan, and verification steps, though it goes beyond the minimal template.
Linked Issues check	✅ Passed	The code changes align with issue #26317 requirements: glob patterns with no matches now pass the literal pattern to commands (matching bash behavior) instead of erroring, fixing the 'rimraf dist/*' failure scenario.
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing glob expansion behavior: modifications to Expansion.zig core logic, updated tests for the new behavior, and a regression test for issue #26317.

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