fix: ignore dots inside brackets when extracting basename

[eastdraconis]

Description

I'm using .test, .setup, etc. and to ignore it, if I allow ignoreMiddleExtensions, I get an error in the app router's [...auth] etc

This PR fixes the getBasename function to properly handle dots inside brackets (e.g., [...]) when extracting the base filename. Previously, dots inside brackets were incorrectly treated as extension separators.

Problem

When processing filenames with brackets containing dots (e.g., Next.js dynamic routes like [[...slug]].tsx), the getBasename function would incorrectly identify dots inside brackets as extension delimiters.

Example:

• Before: getBasename('[[...slug]].tsx') would incorrectly split at the first dot inside brackets
• After: getBasename('[[...slug]].tsx') correctly returns '[[...slug]]'

Solution

Modified the getBasename function to:

1. Track bracket depth while scanning the filename
2. Only consider dots that are outside of bracket pairs as extension separators
3. Return the full filename if no dots exist outside brackets

Changes

Core Changes

• lib/utils/filename.js: Refactored getBasename to skip dots inside brackets
  • Added findDotsOutsideBrackets helper function
  • Maintains bracket depth tracking
  • Only treats dots at depth 0 as extension separators

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ed88e9f) to head (a1582b1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #64   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           14        14           
  Lines         1083      1101   +18     
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+ Hits          1083      1101   +18     

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[dukeluo]

@eastdraconis thanks for your PR!