30 Web APPS in 30 days all made in vanilla JS.
Is it a library? NO
Using "VanillaJS" means using plain JavaScript without any additional libraries like jQuery.
People use it as a joke to remind other developers that many things can be done nowadays without the need for additional JavaScript libraries.
Here's a funny site that jokingly talks about this: VanillaJS
When you download the JS framework they provide, all you get is a .js file containing
// VanillaJS v1.0
// Released into the Public Domain
// Your code goes here:
As you can see, it's not really a framework or a library. It's just a running gag for framework-loving bosses or people who think you NEED to use a JS framework. It means you just use whatever your browser gives you.
NO FRAMEWORKS NO COMPILERS NO LIBRARIES NO BOILERPLATE
Special Thanks to Particles.JS for index page