blog.jonasjones.dev/svelte.config.js

import { vitePreprocess } from '@sveltejs/vite-plugin-svelte'
import adapter from '@sveltejs/adapter-cloudflare';

export default {
  // Consult https://svelte.dev/docs#compile-time-svelte-preprocess
  // for more information about preprocessors
  preprocess: vitePreprocess(),

  kit: {
		adapter: adapter({
			// See below for an explanation of these options
			routes: {
				include: ['/*'],
				exclude: ['<all>']
			},
			platformProxy: {
				configPath: 'wrangler.toml',
				environment: undefined,
				experimentalJsonConfig: false,
				persist: false
			}
		})
	}
}