refactor: migrate build system from Rollup to Vite (#2578)

.build/vite.config.helper.mjs

@@ -0,0 +1,60 @@
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { defineConfig } from 'vite'
+
+/**
+ * Creates a Vite configuration for building libraries
+ * @param {Object} options - Configuration options
+ * @param {string} options.entry - Path to the entry file
+ * @param {string|undefined} options.name - Library name (undefined for ESM)
+ * @param {string|Function} options.fileName - Output file name or function returning it
+ * @param {string[]} options.formats - Output formats (e.g., ['es'], ['umd'], ['es', 'umd'])
+ * @param {string} options.outDir - Output directory path
+ * @param {string|undefined} options.banner - Optional banner text to add to output
+ * @returns {import('vite').UserConfig} Vite configuration
+ */
+export function createViteConfig({
+	entry,
+	name,
+	fileName,
+	formats,
+	outDir,
+	banner
+}) {
+	const rollupOutput = {
+		generatedCode: {
+			constBindings: true
+		}
+	}
+
+	// Add banner if provided
+	if (banner) {
+		rollupOutput.banner = banner
+	}
+
+	return defineConfig({
+		build: {
+			lib: {
+				entry: path.resolve(entry),
+				name: name,
+				fileName: typeof fileName === 'function' ? fileName : () => fileName,
+				formats: formats
+			},
+			outDir: path.resolve(outDir),
+			emptyOutDir: false,
+			sourcemap: true,
+			rollupOptions: {
+				output: rollupOutput
+			},
+			target: 'es2015',
+			minify: false // Minification is done by terser in a separate step
+		},
+		define: {
+			'process.env.NODE_ENV': '"production"'
+		},
+		esbuild: {
+			target: 'es2015'
+		}
+	})
+}
+