Next.js

import { Link, useRouter } from "@kanzo-tech/navigation/next";

Two names, each a drop-in for the one Next ships, and next 15.3 or 16 as an optional peer — 15.3 is the release in which Link gained onNavigate.

Why a door at all. The App Router writes the URL of a client navigation after the new route has rendered, so by the time the browser reports it there is nothing left to cancel. What Next offers instead is public and early: Link's onNavigate, and the router a component asks for. The navigation layer has the source it was read from.

Link

next/link, with onNavigate consulting the blockers. Every prop is next/link's, and your own onNavigate still runs first — if it prevents the navigation, the blockers are not asked.

A blocker that answers false synchronously costs nothing: the link navigates as it would have. Anything else cancels the click there and then, and proceed re-issues the navigation through router.push or router.replace with the same scroll. The re-issued navigation does not carry useLinkStatus's pending state.

It works as the asChild child of Link, SidebarMenuButton, BreadcrumbLink and MenuItem exactly as next/link does, because those parts never navigate — they hand navigation to their child.

useRouter

next/navigation's useRouter, with push and replace asking the blockers first and calling Next's own on proceed. back, forward, refresh and prefetch are Next's, untouched: back and forward are traversals, which the root's navigate listener already sees before they commit.

Close the door behind you

A raw next/link or useRouter from next/navigation walks straight past both, and nothing at runtime can notice — there is no event to listen for. Forbid them in the product:

{
  rules: {
    "no-restricted-imports": ["error", {
      paths: [
        { name: "next/link", message: "Use Link from @kanzo-tech/navigation/next." },
        {
          name: "next/navigation",
          importNames: ["useRouter"],
          message: "Use useRouter from @kanzo-tech/navigation/next.",
        },
      ],
    }],
  },
}

usePathname, useSearchParams and the rest of next/navigation stay importable; only the router is closed.