mount, update, and flush

mount(el, tag, options?)

mount clears the host, creates <tag> inside it, and returns the new element:

const app = mount(document.getElementById("app"), "x-app");

Pass { dev: true } while developing to show component error messages in the page and enable diagnostics for class/style bindings and live store subscriptions:

mount(document.getElementById("app"), "x-app", { dev: true });

update(el)

update(el) requests a re-render. Calls are batched, so an event can update ordinary state and request a single DOM flush.

flush()

flush() processes pending updates synchronously:

update(el);
flush();