subscribe(fn) {
		const store = __SVELTEKIT_DEV__ ? get_store('navigating') : getStores().navigating;
		return store.subscribe(fn);
	}
A readable store.
When navigating starts, its value is a `Navigation` object with `from`, `to`, `type` and (if `type === 'popstate'`) `delta` properties.
When navigating finishes, its value reverts to `null`.

On the server, this store can only be subscribed to during component initialization. In the browser, it can be subscribed to at any time.

@deprecated Use `navigating` from `$app/state` instead (requires Svelte 5, [see docs for more info](https://svelte.dev/docs/kit/migrating-to-sveltekit-2#SvelteKit-2.12:-$app-stores-deprecated))
@type {import('svelte/store').Readable<import('@sveltejs/kit').Navigation | null>}