Visualizing SvelteKit bundles with Sonda

To analyze and visualize your SvelteKit bundles, you need to install the Sonda npm package and add the Sonda plugin to your SvelteKit configuration.

Installation

Install the package

To get started, install the Sonda package using the following command:

npm install sonda --save-dev

Add the plugin and enable source maps

Next, register the Sonda plugin for SvelteKit and enable source maps in the vite.config.ts file:

import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';
import Sonda from 'sonda/sveltekit';  

export default defineConfig({
  build: {
    sourcemap: true
  },
  plugins: [
    sveltekit(),
    Sonda()  
  ]
});

Sonda requires source maps to function correctly, but some other plugins may not support or generate them by default. If Sonda does not work as expected, check the documentation for the other plugins you are using to ensure source maps are enabled.

Configure the plugin

The steps above will allow you to generate your first report. However, if the report does not contain the information you need, refer to the Configuration page to explore additional options and learn how to enable them.

Generating a report for the server bundle

In addition to the options listed on the configuration page, the SvelteKit integration has an additional option called server. This option enables Sonda to generate a report for the server bundle as well and it requires the build.sourcemap option to be enabled in the SvelteKit configuration.

import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';
import Sonda from 'sonda/sveltekit';

export default defineConfig({
  build: {
    sourcemap: true
  },
  plugins: [
    sveltekit(),
    Sonda( { 
      server: true
    } ) 
  ]
} );