return path.charAt(0) === '/'; - TypeError: Cannot read property 'charAt' of undefined

[ChrisCinelli]

We had a this error:

  build
  clean
  copy
  build/package.json
  bundle
  path.js:479
   return path.charAt(0) === '/';
              ^
  TypeError: Cannot read property 'charAt' of undefined
     at Object.posix.isAbsolute (path.js:479:14)
     at Object.posix.normalize (path.js:461:26)
     at formatSassError (/myproduct/node_modules/sass-loader/index.js:55:25)
     at Object.onRender (/myproduct/node_modules/sass-loader/index.js:251:13)
     at /myproduct/node_modules/sass-loader/node_modules/async/lib/async.js:868:35
     at _arrayEach (/myproduct/node_modules/sass-loader/node_modules/async/lib/async.js:91:13)
     at Object.<anonymous> (/myproduct/node_modules/sass-loader/node_modules/async/lib/async.js:867:17)
     at Object.callback (/myproduct/node_modules/sass-loader/node_modules/async/lib/async.js:44:16)
     at options.error (/myproduct/node_modules/node-sass/lib/index.js:279:32)

I think there are 2 bugs. One in sass-loader and another in node-sass.

The problem is that err was an Unknown error.

You may want to at least add a if(err.file) ... before this line https://github.com/jtangelder/sass-loader/blob/74deeb794c1bac6ce5d1f85f6dcbfd7d1a010e53/index.js#L55
But you may just saying that Unknown Error was received and "sorry we cannot give more explanations".

It looks like that node-sass compiler was hanging on _problematic_file.sass that was included in the base style.sass. This file was starting with:

    &
         color: #fff 
         ... 

It took a while to find the problem because no error was pointing to that file specifically.

[jorrit]

Would #158 be a fix?