undefined

**What to determine:**

| Question | Impact |
|----------|--------|
| React 19+? | Use `reactErrorHandler()` hook pattern |
| React <19? | Use `Sentry.ErrorBoundary` |
| `@sentry/react` already present? | Skip install, go straight to feature config |
| `react-router-dom` v5 / v6 / v7? | Determines which router integration to use |
| `@tanstack/react-router`? | Use `tanstackRouterBrowserTracingIntegration()` |
| Redux in use? | Recommend `createReduxEnhancer()` |
| Vite detected? | Source maps via `sentryVitePlugin` |
| CRA (`react-scripts`)? | Source maps via `@sentry/webpack-plugin` in CRACO |
| Backend directory found? | Trigger Phase 4 cross-link suggestion |

---

npm install @sentry/react --save

import * as Sentry from "@sentry/react";

Sentry.init({
  dsn: import.meta.env.VITE_SENTRY_DSN, // Adjust per build tool (see table below)
  environment: import.meta.env.MODE,
  release: import.meta.env.VITE_APP_VERSION, // inject at build time

  sendDefaultPii: true,

  integrations: [
    Sentry.browserTracingIntegration(),
    Sentry.replayIntegration({
      maskAllText: true,
      blockAllMedia: true,
    }),
  ],

  // Tracing
  tracesSampleRate: 1.0, // lower to 0.1–0.2 in production
  tracePropagationTargets: ["localhost", /^https:\/\/yourapi\.io/],

  // Session Replay
  replaysSessionSampleRate: 0.1,
  replaysOnErrorSampleRate: 1.0,

  enableLogs: true,
});

// src/main.tsx (Vite) or src/index.tsx (CRA/webpack)
import "./instrument";              // ← MUST be first

import { StrictMode } from "react";
import { createRoot } from "react-dom/client";
import App from "./App";

createRoot(document.getElementById("root")!).render(
  <StrictMode>
    <App />
  </StrictMode>
);

import { reactErrorHandler } from "@sentry/react";

createRoot(document.getElementById("root")!, {
  onUncaughtError: reactErrorHandler(),
  onCaughtError: reactErrorHandler(),
  onRecoverableError: reactErrorHandler(),
}).render(<App />);

import * as Sentry from "@sentry/react";

createRoot(document.getElementById("root")!).render(
  <Sentry.ErrorBoundary fallback={<p>Something went wrong</p>} showDialog>
    <App />
  </Sentry.ErrorBoundary>
);

// in instrument.ts integrations array:
import React from "react";
import {
  createRoutesFromChildren, matchRoutes,
  useLocation, useNavigationType,
} from "react-router-dom"; // or "react-router" for v7
import * as Sentry from "@sentry/react";
import { reactRouterV6BrowserTracingIntegration } from "@sentry/react";
import { createBrowserRouter } from "react-router-dom";

// Option A — createBrowserRouter (recommended for v6.4+):
const sentryCreateBrowserRouter = Sentry.wrapCreateBrowserRouterV6(createBrowserRouter);
const router = sentryCreateBrowserRouter([...routes]);

// Option B — createBrowserRouter for React Router v7:
// const sentryCreateBrowserRouter = Sentry.wrapCreateBrowserRouterV7(createBrowserRouter);

// Option C — integration with hooks (v6 without data APIs):
Sentry.init({
  integrations: [
    reactRouterV6BrowserTracingIntegration({
      useEffect: React.useEffect,
      useLocation,
      useNavigationType,
      matchRoutes,
      createRoutesFromChildren,
    }),
  ],
});

import { tanstackRouterBrowserTracingIntegration } from "@sentry/react";

// Pass your TanStack router instance:
Sentry.init({
  integrations: [tanstackRouterBrowserTracingIntegration(router)],
});

import * as Sentry from "@sentry/react";
import { configureStore } from "@reduxjs/toolkit";

const store = configureStore({
  reducer: rootReducer,
  enhancers: (getDefaultEnhancers) =>
    getDefaultEnhancers().concat(Sentry.createReduxEnhancer()),
});

import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
import { sentryVitePlugin } from "@sentry/vite-plugin";

export default defineConfig({
  build: { sourcemap: "hidden" },
  plugins: [
    react(),
    sentryVitePlugin({
      org: process.env.SENTRY_ORG,
      project: process.env.SENTRY_PROJECT,
      authToken: process.env.SENTRY_AUTH_TOKEN,
    }),
  ],
});

SENTRY_AUTH_TOKEN=sntrys_...
SENTRY_ORG=my-org-slug
SENTRY_PROJECT=my-project-slug

npm install @craco/craco @sentry/webpack-plugin --save-dev

// craco.config.js
const { sentryWebpackPlugin } = require("@sentry/webpack-plugin");

module.exports = {
  webpack: {
    plugins: {
      add: [
        sentryWebpackPlugin({
          org: process.env.SENTRY_ORG,
          project: process.env.SENTRY_PROJECT,
          authToken: process.env.SENTRY_AUTH_TOKEN,
        }),
      ],
    },
  },
};

// Add a temporary test button anywhere in your app
import * as Sentry from "@sentry/react";

function SentryTest() {
  return (
    <>
      <button onClick={() => { throw new Error("Sentry React test error"); }}>
        Test Error
      </button>
      <button onClick={() => Sentry.captureMessage("Sentry test message", "info")}>
        Test Message
      </button>
    </>
  );
}

ls ../backend ../server ../api ../go ../python 2>/dev/null
cat ../go.mod 2>/dev/null | head -3
cat ../requirements.txt ../pyproject.toml 2>/dev/null | head -3
cat ../Gemfile 2>/dev/null | head -3
cat ../pom.xml 2>/dev/null | grep '<artifactId>' | head -3