Custom Visual - \src\** contains invalid WIN32 path characters.

I am trying to include all files in src directory in tsconfig.ts (files). When I am building PBI custom visual, I am getting error - "\src\** contains invalid WIN32 path characters." Do I need to specify each file seperately? Folder structure is as given below. I tried including these files as "./src/**/*" in "include" section.
 

tsconfig.json

"files:" [ "src/**/*.ts"]

Folder structure:

src

     - ABC

              -abc.ts

     - DEF

             -def.ts