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Sentry

Official Sentry SDK for SvelteKit

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Compatibility

The minimum supported version of SvelteKit is 1.0.0. The SDK works best with Vite 4.2 and newer. Older Vite versions might not generate source maps correctly.

The SDK supports the following SvelteKit adapters:

  • @sveltejs/adapter-auto - for Vercel with the Node runtime. Other deployment targets might work but we don't guarantee compatibility.
  • @sveltejs/adapter-vercel - only for Node (Lambda) runtimes, not yet Vercel's edge runtime
  • @sveltejs/adapter-node

If you use the SDK with other adapters, we cannot guarantee that everything works as expected. You might need to manually configure source maps upload. The SDK is currently not compatible with none-Node server runtimes, such as Vercel's Edge runtime or Cloudflare workers.

General

This package is a wrapper around @sentry/node for the server and @sentry/svelte for the client side, with added functionality related to SvelteKit.

Automatic Setup

We recommend installing the SDK by running the Sentry wizard in the root directory of your project:

npx @sentry/wizard@latest -i sveltekit

Take a look at the sections below if you want to customize your SDK configuration.

Manual Setup

If the setup through the wizard doesn't work for you, you can also set up the SDK manually.

1. Prerequesits & Installation

  1. Install the Sentry SvelteKit SDK:

    # Using npm
npm install @sentry/sveltekit

# Using yarn
yarn add @sentry/sveltekit

2. Client-side Setup

The Sentry SvelteKit SDK mostly relies on SvelteKit Hooks to capture error and performance data.

  1. If you don't already have a client hooks file, create a new one in src/hooks.client.(js|ts).

  2. On the top of your hooks.client.(js|ts) file, initialize the Sentry SDK:

    // hooks.client.(js|ts)
import * as Sentry from '@sentry/sveltekit';

Sentry.init({
  dsn: '__DSN__',
  tracesSampleRate: 1.0,
  // For instance, initialize Session Replay:
  replaysSessionSampleRate: 0.1,
  replaysOnErrorSampleRate: 1.0,
  integrations: [Sentry.replayIntegration()],
});

  3. Add our handleErrorWithSentry function to the handleError hook:

    // hooks.client.(js|ts)
import { handleErrorWithSentry } from '@sentry/sveltekit';

const myErrorHandler = ({ error, event }) => {
  console.error('An error occurred on the client side:', error, event);
};

export const handleError = handleErrorWithSentry(myErrorHandler);
// or alternatively, if you don't have a custom error handler:
// export const handleError = handleErrorWithSentry();

3. Server-side Setup

  1. If you don't already have a server hooks file, create a new one in src/hooks.server.(js|ts).

  2. On the top of your hooks.server.(js|ts) file, initialize the Sentry SDK:

    // hooks.server.(js|ts)
import * as Sentry from '@sentry/sveltekit';

Sentry.init({
  dsn: '__DSN__',
  tracesSampleRate: 1.0,
});

  3. Add our handleErrorWithSentry function to the handleError hook:

    // hooks.server.(js|ts)
import { handleErrorWithSentry } from '@sentry/sveltekit';

const myErrorHandler = ({ error, event }) => {
  console.error('An error occurred on the server side:', error, event);
};

export const handleError = handleErrorWithSentry(myErrorHandler);
// or alternatively, if you don't have a custom error handler:
// export const handleError = handleErrorWithSentry();

  4. Add our request handler to the handle hook in hooks.server.ts:

    // hooks.server.(js|ts)
import { sentryHandle } from '@sentry/sveltekit';

export const handle = sentryHandle();
// or alternatively, if you already have a handler defined, use the `sequence` function
// see: https://kit.svelte.dev/docs/modules#sveltejs-kit-hooks-sequence
// export const handle = sequence(sentryHandle(), yourHandler());

4. Vite Setup

Add sentrySvelteKit to your Vite plugins in vite.config.(js|ts) file so that the Sentry SDK can apply build-time features. Make sure that it is added before the sveltekit plugin:

// vite.config.(js|ts)
import { sveltekit } from '@sveltejs/kit/vite';
import { sentrySvelteKit } from '@sentry/sveltekit';

export default {
  plugins: [sentrySvelteKit(), sveltekit()],
  // ... rest of your Vite config
};

This adds the Sentry Vite Plugin to your Vite config to automatically upload source maps to Sentry.

Uploading Source Maps

After completing the Vite Setup, the SDK will automatically upload source maps to Sentry, when you build your project. However, you still need to specify your Sentry auth token as well as your org and project slugs. You can either set them as env variables (for example in a .env file):

  • SENTRY_ORG your Sentry org slug
  • SENTRY_PROJECT your Sentry project slug
  • SENTRY_AUTH_TOKEN your Sentry auth token

Or you can pass them in whatever form you prefer to sentrySvelteKit:

// vite.config.(js|ts)
import { sveltekit } from '@sveltejs/kit/vite';
import { sentrySvelteKit } from '@sentry/sveltekit';

export default {
  plugins: [
    sentrySvelteKit({
      sourceMapsUploadOptions: {
        org: 'my-org-slug',
        project: 'my-project-slug',
        authToken: process.env.SENTRY_AUTH_TOKEN,
      },
    }),
    sveltekit(),
  ],
  // ... rest of your Vite config
};

Configuring Source maps upload

Under sourceMapsUploadOptions, you can also specify all additional options supported by the Sentry Vite Plugin. This might be useful if you're using adapters other than the Node adapter or have a more customized build setup.

// vite.config.(js|ts)
import { sveltekit } from '@sveltejs/kit/vite';
import { sentrySvelteKit } from '@sentry/sveltekit';

export default {
  plugins: [
    sentrySvelteKit({
      sourceMapsUploadOptions: {
        org: 'my-org-slug',
        project: 'my-project-slug',
        authToken: process.env.SENTRY_AUTH_TOKEN,
        include: ['dist'],
        cleanArtifacts: true,
        setCommits: {
          auto: true,
        },
      },
    }),
    sveltekit(),
  ],
  // ... rest of your Vite config
};

Disabeling automatic source map upload

If you don't want to upload source maps automatically, you can disable it as follows:

// vite.config.(js|ts)
import { sveltekit } from '@sveltejs/kit/vite';
import { sentrySvelteKit } from '@sentry/sveltekit';

export default {
  plugins: [
    sentrySvelteKit({
      autoUploadSourceMaps: false,
    }),
    sveltekit(),
  ],
  // ... rest of your Vite config
};

Configure Auto-Instrumentation

The SDK mostly relies on SvelteKit's hooks to collect error and performance data. However, SvelteKit doesn't yet offer a hook for universal or server-only load function calls. Therefore, the SDK uses a Vite plugin to auto-instrument load functions so that you don't have to add a Sentry wrapper to each function manually. Auto-instrumentation is enabled by default, as soon as you add the sentrySvelteKit() function call to your vite.config.(js|ts). However, you can customize the behavior, or disable it entirely. In this case, you can still manually wrap specific load functions with the withSentry function.

Note: The SDK will only auto-instrument load functions in +page or +layout files that do not yet contain any Sentry code. If you already have custom Sentry code in such files, you'll have to manually add our wrapper to your load functions.

Customize Auto-instrumentation

By passing the autoInstrument option to sentrySvelteKit you can disable auto-instrumentation entirely, or customize which load functions should be instrumented:

// vite.config.(js|ts)
import { sveltekit } from '@sveltejs/kit/vite';
import { sentrySvelteKit } from '@sentry/sveltekit';

export default {
  plugins: [
    sentrySvelteKit({
      autoInstrument: {
        load: true, // universal load functions
        serverLoad: false, // server-only load functions
      },
    }),
    sveltekit(),
  ],
  // ... rest of your Vite config
};

Disable Auto-instrumentation

If you set the autoInstrument option to false, the SDK won't auto-instrument any load function. You can still manually instrument specific load functions.

// vite.config.(js|ts)
import { sveltekit } from '@sveltejs/kit/vite';
import { sentrySvelteKit } from '@sentry/sveltekit';

export default {
  plugins: [
    sentrySvelteKit({
      autoInstrument: false;
    }),
    sveltekit(),
  ],
  // ... rest of your Vite config
};

Instrument load Functions Manually

If you don't want to use auto-instrumentation, you can also manually instrument specific load functions with our load function wrappers:

To instrument your universal load functions in +(page|layout).(js|ts), wrap our wrapLoadWithSentry function around your load code:

import { wrapLoadWithSentry } from '@sentry/sveltekit';

export const load = wrapLoadWithSentry(event => {
  //... your load code
});

To instrument server load functions in +(page|layout).server.(js|ts), wrap our wrapServerLoadWithSentry function around your load code:

import { wrapServerLoadWithSentry } from '@sentry/sveltekit';

export const load = wrapServerLoadWithSentry(event => {
  //... your server load code
});