instrumentation-client.ts

// Sentry is loaded via dynamic import() to keep it out of the shared
// framework chunk. This reduces first-load JS by ~130kB gzipped.
// The import executes immediately so the SDK initializes before the
// first user interaction in practice.
let captureTransition: ((url: string, type: string) => void) | null = null;

import("@sentry/nextjs").then(async (Sentry) => {
  const { shouldDropClientEvent } = await import("@/lib/sentry");

  Sentry.init({
    dsn: process.env.NEXT_PUBLIC_SENTRY_DSN,

    sendDefaultPii: true,

    // 100% in dev, 10% in production
    tracesSampleRate: process.env.NODE_ENV === "development" ? 1.0 : 0.1,

    // Session Replay: 10% of all sessions, 100% of sessions with errors
    replaysSessionSampleRate: 0.1,
    replaysOnErrorSampleRate: 1.0,

    enableLogs: true,

    integrations: [Sentry.replayIntegration()],

    beforeSend(event) {
      return shouldDropClientEvent(event) ? null : event;
    },
  });

  captureTransition = Sentry.captureRouterTransitionStart;
});

export function onRouterTransitionStart(
  url: string,
  navigationType: "push" | "replace" | "traverse",
) {
  captureTransition?.(url, navigationType);
}