The webdriver promises were recently made generic (that whole commit is actually pretty impressive!) but I think the definitions for the then methods are slightly incorrect. Looking at the original jsdoc (which I assume was imported from the original closure annotations) some edits appear to be necessary:
1. The return type of the success callback should match the returned promise's generic type.
2. The success callback can return a promise that will automatically be unwrapped.
I also made some other housekeeping edits:
* removed @param type information and @template since TypeScript puts type annotations directly in the code
* my editor removes trailing whitespace and adds a newline at the EOF
Once TypeScript 1.4 is out, these definitions can likely be simplified by using union types.
The CI build was failing because it tries to compile each file
individually. To fix this I merged all of the files into one. I also
deleted the legacy files since those versions are no longer supported.
