npm install --save @types/chai
This package contains type definitions for chai (http://chaijs.com/).
Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/chai
Additional Details
These definitions were written by Jed Mao https://github.com/jedmao, Bart van der Schoor https://github.com/Bartvds, Andrew Brown https://github.com/AGBrown, Olivier Chevet https://github.com/olivr70, Matt Wistrand https://github.com/mwistrand, Josh Goldberg https://github.com/joshuakgoldberg, Shaun Luttin https://github.com/shaunluttin, Gintautas Miselis https://github.com/Naktibalda, Satana Charuwichitratana https://github.com/micksatana, Erik Schierboom https://github.com/ErikSchierboom, and Rebecca Turner https://github.com/9999years.