Exception when loading .proto files stored on a UNC

[TomWilloughby]

protobuf.js version: 6.8.8

• Assume I'm storing my javascript files in \\DESKTOP-2PLO61T\distributed\node\my-package\
• Attempt to load api.proto from \\DESKTOP-2PLO61T\distributed\node\my-package\node_modules\protobufjs\google\protobuf\api.proto using Root.load()
• util.path.resolve() calls util.path.normalize() and the path to api.proto changes to /DESKTOP-2PLO61T/distributed/node/my-package/node_modules/protobufjs/google/protobuf/api.proto
• Note the single forward slash at the beginning of the path instead of two back slashes
• Exception thrown because the normalized path is not a valid path to api.proto

index.js:

var path = require('path');
var Protobuf = require("protobufjs");

var sourceDir = path.join(path.dirname(require.resolve('protobufjs')), 'google', 'protobuf');
var file = path.join(sourceDir, "api.proto");
Protobuf.loadSync(file).toJSON();  // Exception

package.json:

{
  "name": "test",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "protobufjs": "^6.8.8"
  }
}

Exception from running node \\DESKTOP-2PLO61T\distributed\node\my-package\index.js:

\\DESKTOP-2PLO61T\distributed\node\my-package\node_modules\protobufjs\src\root.js:94
            throw err;
            ^

Error: ENOENT: no such file or directory, open '/DESKTOP-2PLO61T/distributed/node/my-package/node_modules/protobufjs/google/protobuf/api.proto'
    at Object.openSync (fs.js:443:3)
    at Object.readFileSync (fs.js:343:35)
    at fetch (\\DESKTOP-2PLO61T\distributed\node\my-package\node_modules\protobufjs\src\root.js:160:34)
    at Root.load (\\DESKTOP-2PLO61T\distributed\node\my-package\node_modules\protobufjs\src\root.js:194:13)
    at Root.loadSync (\\DESKTOP-2PLO61T\distributed\node\my-package\node_modules\protobufjs\src\root.js:235:17)
    at Object.loadSync (\\DESKTOP-2PLO61T\distributed\node\my-package\node_modules\protobufjs\src\index-light.js:69:17)
    at Object.<anonymous> (\\DESKTOP-2PLO61T\distributed\node\my-package\index.js:6:10)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)

If you think this is a valid issue and there's no workaround, I'll try to find time to make a PR to address it.

[TomWilloughby]

I created a pull request to fix this issue. It includes tests to cover the UNC use case and minimal code changes to pass the tests.