localization files packaged with a doubled .js.js extension

[JeyDim]

Describe the bug

In BlazorMonaco 3.5.0, all 14 Monaco localization files under
staticwebassets/lib/monaco-editor/min/vs/ are packaged with a doubled
.js.js extension. In 3.4.0 the same files were packaged correctly:

3.4.0 (correct)	3.5.0 (broken)
nls.messages.ru.js	nls.messages.ru.js.js
nls.messages.de.js	nls.messages.de.js.js
nls.messages.js	nls.messages.js.js
… (all locales)	… (all 14 files)

nls.messages-loader.js itself is packaged correctly — only the
nls.messages* payload files are affected. The rest of the package
(loader.js, editor bundle, workers) is intact.

To Reproduce

1. Reference BlazorMonaco 3.5.0 and enable localized UI strings the way
   Monaco's AMD loader expects, e.g.:

   require.config({                                                                                                                                                                                                                                                                                               
       paths: { vs: '_content/BlazorMonaco/lib/monaco-editor/min/vs' },                                                                                                                                                                                                                                           
       'vs/nls': { availableLanguages: { '*': 'ru' } }                                                                                                                                                                                                                                                            
   });                                                                                                                                                                                                                                                                                                            

2. Load the editor. The NLS loader plugin requests
   _content/BlazorMonaco/lib/monaco-editor/min/vs/nls.messages.ru.js
   → 404, because the file in the package is named
   nls.messages.ru.js.js.

You can also verify without running anything — just inspect the nupkg:

  $ ls ~/.nuget/packages/blazormonaco/3.5.0/staticwebassets/lib/monaco-editor/min/vs/nls.messages*                                                                                                                                                                                                                  
  nls.messages-loader.js                                                                                                                                                                                                                                                                                            
  nls.messages.cs.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.de.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.es.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.fr.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.it.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.ja.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.js.js                                                                                                                                                                                                                                                                                                
  nls.messages.ko.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.pl.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.pt-br.js.js                                                                                                                                                                                                                                                                                          
  nls.messages.ru.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.tr.js.js                                                                                                                                                                                                                                                                                             
  nls.messages.zh-cn.js.js                                                                                                                                                                                                                                                                                          
  nls.messages.zh-tw.js.js                                                                                                                                                                                                                                                                                          

Expected behavior

Localization files keep their original names
(nls.messages.<locale>.js), as in 3.4.0, so Monaco's NLS loader can
fetch them.

Impact

Any non-English editor UI is broken on 3.5.0 — the locale file request
404s and Monaco falls back to English (or errors, depending on setup).

[JeyDim]

Update: this turns out to be an upstream bug in the monaco-editor npm package
itself, not in BlazorMonaco's packaging — see microsoft/monaco-editor#5345.

The doubled .js.js names were introduced in monaco-editor 0.55.0 and are
still present in 0.55.1 (0.54.0 is packaged correctly). BlazorMonaco 3.5.0
bundles the affected 0.55.x files as-is, which is how they ended up in the
NuGet package.

Until it's fixed upstream, possible options on the BlazorMonaco side:

• rename nls.messages.*.js.js back to nls.messages.*.js when embedding
  monaco into the package, or
• ship the next release with monaco-editor 0.54.0.
• posible upgrade to monaco-editor 0.56.0 if it's fixes issue

Workaround for consumers remains pinning BlazorMonaco 3.4.0.