no-document-cookie is enabled by default.
The docs tell you to use the Cookie Store API, however this is a poor recommendation as it does not yet have wide browser support.
The docs' other suggestion is to use a cookie library which is a fine suggestion, however I am already using a cookie library. The rule seems to hard ban assigning to document.cookie and the library I'm using is used in the form of:

document.cookie = setCookie(MyCookie, { foo: "baz" })

This is completely safe and is the intended usage but still trips the rule anyway.

If you would prefer to keep no-document-cookie enabled by default, my other suggestion would be to instead make the rule smarter and allow assignments from a called imported function.