Beginner Tutorial

Learn Browser Lifecycle by building a visibility-aware logger.

Goal

Log when the page becomes visible or hidden and clean up when the demo unmounts.

Step 1 — Create the session

import { createBrowserLifecycle } from "@jayoncode/browser-lifecycle";

const lifecycle = createBrowserLifecycle({ autoStart: true });

Step 2 — Subscribe to events

const logs: string[] = [];

const stopVisible = lifecycle.on("page:visible", () => {
  logs.push(`visible @ ${Date.now()}`);
});

const stopHidden = lifecycle.on("page:hidden", () => {
  logs.push(`hidden @ ${Date.now()}`);
});

Expected output: Switching tabs appends timestamped entries to logs.

Step 3 — Inspect state

console.log(lifecycle.getSnapshot().page.visibility);

Step 4 — Clean up

stopVisible();
stopHidden();
lifecycle.dispose();

Common mistakes

• Creating the session during SSR
• Forgetting to call unsubscribe functions
• Assuming page:hidden means the user left the site (it may be another tab)

Try it live

Open the Visibility Playground.

Next tutorial

Intermediate Tutorial