[nuxtjs__auth]  added missing declarations (#40778)
[nuxtjs__auth]  added missing declarations (#40778)

* [nuxtjs__auth] added missing methods declarations

* fixed missed semicolons

georgemarshall/DefinitelyTyped,mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,markogresak/DefinitelyTyped