Start working on tests.

packages/js/vite.config.js

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+// vite.config.js
+import { defineConfig } from 'vite'
+
+export default defineConfig({
+  build: {
+    lib: {
+      // Could also be a dictionary or array of multiple entry points
+      entry: {
+        'index': 'src/index.ts',
+        'document': 'src/document.ts',
+        'parser': 'src/parser.ts',
+        'readers/js-string': 'src/readers/js-string.ts',
+        'readers/node-readline': 'src/readers/node-readline.ts',
+      }
+    },
+    rollupOptions: {
+      external: [
+        `node:fs`,
+        `node:readline/promises`
+      ]
+    }
+  }
+})