add vitest

package.json

@@ -43,6 +43,7 @@
     "jsdoc-json": "^2.0.2",
     "jsdoc-to-markdown": "^7.1.1",
     "lerna": "^4.0.0",
-    "mocha": "^9.1.4"
+    "mocha": "^9.1.4",
+    "vitest": "^0.21.0"
   }
 }

vitest.config.ts

@@ -0,0 +1,7 @@
+import { configDefaults, defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    exclude: [...configDefaults.exclude, 'packages/*/test/*', 'repl/src/test/*'],
+  },
+});