[dannyshafer]

Summary

common() in @std/path (and the posix and windows variants, plus the internal _common/common.ts helper) now takes readonly string[] instead of string[].

Motivation

Part of #5831. common() never mutates its paths argument, so callers holding a readonly array (for example one declared as const) currently get a type error for no reason. Other modules have already been updated the same way (#5832, #5735, #6639, #6911).

Test plan

• Added common() accepts readonly arrays to path/common_test.ts, covering common(), posix.common() and windows.common(). It fails type-checking (TS2345) without the change and passes with it.
• deno test path/: all common tests pass. The only failure was isGlob works with the input that includes large number of open brackets, a timing test that timed out in the (slow) environment this was run in and is unrelated to this change.
• deno fmt --check path/ and deno lint path/ are clean.

This PR was prepared with an AI coding agent (Claude Code).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.03%. Comparing base (f834d02) to head (c3f74e3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7368      +/-   ##
==========================================
- Coverage   95.04%   95.03%   -0.02%     
==========================================
  Files         619      618       -1     
  Lines       52012    51757     -255     
  Branches     9450     9403      -47     
==========================================
- Hits        49434    49185     -249     
+ Misses       2031     2022       -9     
- Partials      547      550       +3     

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