This is js style eclipse format file using to auto format on saving for our project, please following these steps to using:

Step 1:
Windows -> References -> JavaScript -> Code Style -> Formatter -> Import -> select this xml file -> Apply -> OK
Step 2:
Windows -> References -> JavaScript -> Editor -> Save Actions -> Check on Perform the selected actions on save -> Check on Format source code -> Apply -> OK
Formatting all source after applying JS Style format file