fix: use cjs only for export and add types

[achingbrain]

Updates this module to use the latest pattern for chai plugins

• the previous pattern causes problems with modern bundlers as it tries to support cjs, amd and script tags in one file.

Also adds the types from the DefinitleyTyped project so users don't have to include extra deps to use this module.

Also, also upgrades all deps and fixes the new linting errors.