I am referring to usage of generators without promises (or rather code that uses generators in a way that it wouldnt matter if promises or thunks were used). And even then I didn't say that you couldn't, even when using promises and generators together most people make their code unneceasarily sequential.
I used these docs when I was exploring the Immutable.js API! Very helpful, but Immutable just updated to v3 (your docs are v2), which introduces some breaking changes (for example, Vector is now called List). Would you mind updating your docs?