next/client/link: improve internal type annotation (#12468)
next/client/link: improve internal type annotation (#12468)


JeromeFitz/next.js,flybayer/next.js,azukaru/next.js,azukaru/next.js,azukaru/next.js,zeit/next.js,flybayer/next.js,JeromeFitz/next.js,JeromeFitz/next.js,flybayer/next.js,zeit/next.js,azukaru/next.js,flybayer/next.js,zeit/next.js,JeromeFitz/next.js