fix: ignore the error that directoryPath is not a directory

[liximomo]

The error is caused by a specific alias config of webpack, considering the following example:

// webpack.config.js
module.exports = {
  resolve: {
    alias:  {
       "@/foo": ["src/foo/index", "src/foo"] 
     }
  }
}

With the above config, we will get a DirectoryWatcher watching src/foo/index. If you happen to have a src/foo file on your filesystem, you will see the error:

Watchpack Error (initial scan): Error: ENOTDIR: not a directory, scandir '/Users/xx/demo/src/foo'

We could safely ignore the error of ENOTDIR in whatever cases.

Related Issues:
nuxt/bridge#226

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: liximomo / name: X.L (fe84a8b)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.11%. Comparing base (dc690bb) to head (9ccfcf3).
⚠️ Report is 36 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/DirectoryWatcher.js	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (dc690bb) and HEAD (9ccfcf3). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (dc690bb)	HEAD (9ccfcf3)
integration	25	20

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #226       +/-   ##
===========================================
- Coverage   92.12%   78.11%   -14.01%     
===========================================
  Files           6        6               
  Lines        1041     1042        +1     
  Branches      249      250        +1     
===========================================
- Hits          959      814      -145     
- Misses         82      228      +146     

Flag	Coverage Δ
integration	78.11% <0.00%> (-14.01%)	⬇️

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