Svelte and SvelteKit

Svelte + SvelteKit is a framework for building web applications of all sizes, with a beautiful development experience and flexible filesystem-based routing.

This guide covers setting up client-side Real User Monitoring for an existing SvelteKit (or Svelte) application using the Raygun4JS provider.

note: We highly recommend utilizing the CDN installation method for Raygun4JS. Alternative methods like NPM might necessitate additional manual setup, particularly when working with SvelteKit. Additionally, please be aware that SvelteKit offers certain automatic server-side rendering features that could potentially limit Raygun4JS's ability to capture all errors.

Package Manager
CDN

Install Raygun via NPM.

NPM

npm install raygun4js

Yarn

yarn add raygun4js

Bun

bun add raygun4js

Import the Raygun4JS provider into your application inside of App.js (or equivalent for your framework) and activate real user monitoring.

import rg4js from 'raygun4js';

rg4js('apiKey', 'paste_your_api_key_here');
rg4js('enablePulse', true);

Add the following snippet to the beginning of the <head> tag within your markup. Please include this snippet before any other <script> tag references are made to ensure that Raygun has the best chance to capture all error events on the page.

<script type="text/javascript">
  !function(a,b,c,d,e,f,g,h){a.RaygunObject=e,a[e]=a[e]||function(){
  (a[e].o=a[e].o||[]).push(arguments)},f=b.createElement(c),g=b.getElementsByTagName(c)[0],
  f.async=1,f.src=d,g.parentNode.insertBefore(f,g),h=a.onerror,a.onerror=function(b,c,d,f,g){
  h&&h(b,c,d,f,g),g||(g=new Error(b)),a[e].q=a[e].q||[],a[e].q.push({
  e:g})}}(window,document,"script","//cdn.raygun.io/raygun4js/raygun.min.js","rg4js");
</script>

The above snippet will fetch the Raygun4JS script from our CDN asynchronously so it doesn't block the page load. It will also catch errors that are thrown while the page is loading, and send them when the script is ready.

Alternatively, you can download the production script (minified) or the development script (full source). Note: If you encounter a situation where no events are appearing within Raygun, you may need to hard code the protocol so that the CDN matches your hosting environment. This could look like one of the following:

  • https://cdn.raygun.io/raygun4js/raygun.min.js
  • http://cdn.raygun.io/raygun4js/raygun.min.js

This will be in replacement of //cdn.raygun.io/raygun4js/raygun.min.js.

Add the following lines underneath the previous code in Step 1.

<script type="text/javascript">
  rg4js('apiKey', 'paste_your_api_key_here');
  rg4js('enablePulse', true); // Enables Real User Monitoring
</script>

The provider is open source and available at the Raygun4js repository.

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