Incorrect return type in Exec function doc comment?

[leonstafford]

Describe the bug

My TS is rusty, but here, the return type is:

@return {string} This is the result

However, the code appears to return:

: Promise<WebSocket>

** Client Version **

39cd5a7

** Server Version **

39cd5a7

To Reproduce
check repo online

Expected behavior
as described/questioned

** Example Code**
included above

Environment (please complete the following information):
n/a

Additional context
Unsure if this is a valid bug or lack of understanding on my part.