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nicohrubec merged 1 commit into from
Jun 9, 2026
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docs(tanstackstart-react): Initialize Sentry from a dedicated client init file #18324

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27 changes: 22 additions & 5 deletions docs/platforms/javascript/guides/tanstackstart-react/manual-setup/index.mdx
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Expand Up@@ -81,16 +81,13 @@ pnpm add @sentry/tanstackstart-react
<SplitSection>
<SplitSectionText>

Initialize Sentry in your [client entry point](https://tanstack.com/start/latest/docs/framework/react/guide/client-entry-point) `src/client.tsx`:
Create an `instrument.client.ts` file in your `src/` directory and initialize Sentry in it.

</SplitSectionText>
<SplitSectionCode>

```tsx {filename:src/client.tsx}
```tsx {filename:src/instrument.client.ts}
import * as Sentry from "@sentry/tanstackstart-react";
import { StartClient } from "@tanstack/react-start/client";
import { StrictMode, startTransition } from "react";
import { hydrateRoot } from "react-dom/client";

Sentry.init({
dsn: "___PUBLIC_DSN___",
Expand DownExpand Up@@ -132,6 +129,26 @@ Sentry.init({
replaysOnErrorSampleRate: 1.0,
// ___PRODUCT_OPTION_END___ session-replay
});
```

</SplitSectionCode>
</SplitSection>

<SplitSection>
<SplitSectionText>

Then import this file as the **first import** in your [client entry point](https://tanstack.com/start/latest/docs/framework/react/guide/client-entry-point) `src/client.tsx`. This ensures Sentry initializes before any other code runs, so errors and events before hydration are captured.

</SplitSectionText>
<SplitSectionCode>

```tsx {filename:src/client.tsx}
// Sentry initialization should be imported first!
import "./instrument.client";

import { StartClient } from "@tanstack/react-start/client";
import { StrictMode, startTransition } from "react";
import { hydrateRoot } from "react-dom/client";

startTransition(() => {
hydrateRoot(
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