vite.config.js

import { svelte } from '@sveltejs/vite-plugin-svelte';
import { defineConfig } from 'vite';

export default defineConfig(() => {
	return {
		plugins: [
			svelte({
				dynamicCompileOptions({ filename }) {
					if (filename.endsWith('A.svelte')) {
						return {
							preserveWhitespace: true
						};
					}
				},
				compilerOptions({ filename }) {
					if (filename.endsWith('A.svelte')) {
						return {
							preserveWhitespace: false // should be overridden by dynamicCompileOptions above
						};
					}
					if (filename.endsWith('C.svelte')) {
						return {
							preserveWhitespace: true
						};
					}
				}
			})
		],
		build: {
			// make build faster by skipping transforms and minification
			target: 'esnext',
			minify: false
		},
		server: {
			watch: {
				// During tests we edit the files too fast and sometimes chokidar
				// misses change events, so enforce polling for consistency
				usePolling: true,
				interval: 100
			}
		}
	};
});