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: https://github.com/nuxt/bridge/issues/226

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: liximomo / name: X.L (fe84a8b5b4a5b2b22e01d68d27f823c5961f7392)

[codecov[bot]]

Codecov Report

Base: 92.12% // Head: 78.11% // Decreases project coverage by -14.00% :warning:

Coverage data is based on head (9ccfcf3) compared to base (dc690bb). Patch coverage: 0.00% of modified lines in pull request are covered.

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%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/DirectoryWatcher.js	91.06% <0.00%> (-1.51%)	:arrow_down:
lib/reducePlan.js	2.98% <0.00%> (-92.54%)	:arrow_down:
lib/watchEventSource.js	47.69% <0.00%> (-38.47%)	:arrow_down:
lib/watchpack.js	92.14% <0.00%> (-0.83%)	:arrow_down:

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