npm run dev –host network: not exposed

You have to add -- before the actual flag:

npm run dev -- --host

And it should output:

> [email protected] dev
> svelte-kit dev "--host"


  SvelteKit v1.0.0-next.316

  local:   http://localhost:3000
  network: http://***.***.**.**:3000

  Note that all files in the following directories will be accessible to anyone on your network: src/lib, src/routes, .svelte-kit, src, node_modules