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The window.lantern object is a global JavaScript object available on your Shopify theme when the Lantern app is installed and active. It serves as the primary interface for interacting with Lantern from the storefront.

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Accessing the window.lantern Object

You can access the window.lantern object directly from any script running on your storefront. 
if (window.lantern) {
  console.log('Lantern is available!', window.lantern);
}
The window.lantern object is initialized asynchronously. Listen for the lantern:loaded event before using its properties.
window.addEventListener('lantern:loaded', () => {
  console.log('Lantern is now fully loaded and ready to use.');
  // You can now safely use window.lantern properties
  const customer = window.lantern.customer;
});