[zhang-hongjie]

Requirements

• Fill out the relevant sections below; explain items that do not apply.
• Add or update appropriate tests for behavior changes. For documentation-only
  changes, explain why test-suite changes are unnecessary and describe the
  documentation or metadata checks performed.
• Preserve the existing regression, Bash/zsh compatibility and mandatory 100%
  measurable-line coverage gates. Do not weaken checks to obtain a passing result.
• All status checks must pass before merge. Pending or unrun checks are
  not passing results.

Type

• Bug fix
• Feature change
• Performance
• Refactor
• Documentation
• CI/CD
• Test
• Build
• Style
• Chore

Issue (only for type bug fix/feature change)

No separate issue filed. The bug was reproduced in a real macOS login zsh where
both $0 and ZSH_ARGZERO are -zsh.

Description of the Change

Fix THIS_SCRIPT_NAME initialization for login shells.

Previously, basename "$_bash_base_argzero" treated -zsh as an option on
macOS and printed basename: illegal option -- z.

The implementation now uses shell parameter expansion and strips the login-shell
leading -. Regression tests cover both -bash and -zsh.

Contract and Compatibility

Regular Bash/zsh invocation names keep the same result.

Login-shell names are normalized:

• -bash -> bash
• -zsh -> zsh

THIS_SCRIPT_PATH behavior is intentionally unchanged.

No new dependencies or breaking API changes are introduced.

Validation

Completed:

• reproduced the bug with a real login zsh: $0=-zsh, ZSH_ARGZERO=-zsh
• verified the failing code path in the installed Bash-base
• added login-style Bash/zsh regression coverage
• verified the Bash -bash normalization path

Pending before merge:

• npm test
• mandatory 100% measurable-line coverage gate
• all GitHub Actions status checks

Possible Drawbacks

The fix removes the external basename call for this value and normalizes a
leading login-shell -.

THIS_SCRIPT_PATH is deliberately not changed; its login-shell semantics may
need separate review.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (013a3f7) to head (ba854fc).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #61   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          585       586    +1     
=========================================
+ Hits           585       586    +1     

Flag	Coverage Δ
strict-union	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 2.5.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release
• v2.5.2

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