what is your favorite javascript library?

for me, it must be socket.io which brings tomorrow's two-way communication between client and server to TODAY

what a joke! favorite js library? js is totally lacking in libraries (dont say node/npm you will only embarrase yourself more). Even Lua comes with a complete set of libraries for doing almost any task, and most those libraries were written by the 3 language devs. I cant believe how a huge language like js can still go without a standard set of libraries for common tasks