@fougere/state-cookie

A caller's state, kept in a cookie

An op reads and writes the caller's state by name (state: State); state: in fougere.config.ts says how each name is kept. Importing this package makes cookie one of the ways:

import '@fougere/state-cookie';

export default defineFougere({
  state: { cart: { cookie: { maxAge: 604800 } } },   // HttpOnly, SameSite=Lax, Path=/ unless said otherwise
});

Core signs every value before it leaves (FOUGERE_STATE_KEY): the caller can read its cookie, and a changed one reads as absent. Every HTTP door carries it — REST, GraphQL, and the envelope a page calls.