commerce/lib/gtm.ts

// lib/gtm.ts
type WindowWithDataLayer = Window & {
  dataLayer: Record<string, any>[];
};

declare const window: WindowWithDataLayer;

export const GTM_ID = process.env.NEXT_PUBLIC_GTM_ID;

export const pageview = (url: string) => {
  if (typeof window.dataLayer !== 'undefined') {
    window.dataLayer.push({
      event: 'pageview',
      page: url
    });
  } else {
    console.debug({
      event: 'pageview',
      page: url
    });
  }
};