import { svelte, vitePreprocess } from '@sveltejs/vite-plugin-svelte';
import tailwindcss from '@tailwindcss/vite';
import { viteSingleFile } from 'vite-plugin-singlefile';
import { defineConfig } from 'vite';
import { fileURLToPath } from 'node:url';

// Builds the keepsake viewer as ONE self-contained index.html (all JS + CSS
// inlined) so it renders when opened via file://. Uses the plain Svelte plugin
// (not SvelteKit) because SvelteKit emits multiple module entry points, which
// cannot be inlined into a single file.
export default defineConfig({
	plugins: [
		tailwindcss(),
		svelte({ configFile: false, preprocess: vitePreprocess(), compilerOptions: { runes: true } }),
		viteSingleFile()
	],
	resolve: {
		alias: { $lib: fileURLToPath(new URL('./src/lib', import.meta.url)) }
	},
	build: {
		outDir: fileURLToPath(new URL('../../backend/static/export-viewer', import.meta.url)),
		emptyOutDir: true,
		target: 'es2020'
	}
});