Exclude files from nested directory in preprocessor

I have directory structure like,

```
└── src/
├── index.js
├── index.js.text
├── index.test.js
├── README.txt
├── startuptest.js
├── lib/
| ├── util.js
| ├── util.test.js
| └── filters/
| ├── kalman.js
| └── lowpass.js
├── test/
| ├── main.js
| └── lib/
| ├── filters.js
| └── util.js
└── vendor/
├── jquery.js
└── three/
├── three.js
└── three.fps.js
```

I want a code coverage for all *.js files under src folder expect `src/lib/!(filters)/** ` and `src/!(test)/**,`

I tried,

`{src/**, src/lib/!(filters)/**, src/!(test)/**}/!(*.spec!).js : coverage `

but its excluding everything and giving coverage report only for files under lib folder except filters folder.

Any thoughts on how this can be solved?

Adding OP - http://stackoverflow.com/questions/42105675/karma-config-to-exclude-nested-directories

Start by reproducing the reported preprocessor pattern against the shown src tree and compare which files are included in the coverage report. Check the linked Stack Overflow context for the intended exclusion semantics; done means JavaScript files are covered while src/lib/filters and src/test are excluded as described.

Written by the indexing model from the issue text.