Merge vitest

vite.config.ts

@@ -0,0 +1,35 @@
+import { Generator } from 'jison';
+import { defineConfig } from 'vitest/config';
+
+const fileRegex = /\.jison$/;
+
+/** Transforms jison to js. */
+export function jisonPlugin() {
+  return {
+    name: 'transform-jison',
+
+    transform(src: string, id: string) {
+      if (fileRegex.test(id)) {
+        // eslint-disable-next-line no-console
+        console.log('Transforming', id);
+        return {
+          // @ts-ignore no typings for jison
+          code: new Generator(src, { 'token-stack': true }).generate(),
+          map: null, // provide source map if available
+        };
+      }
+    },
+  };
+}
+
+export default defineConfig({
+  resolve: {
+    extensions: ['.jison', '.js', '.ts', '.json'],
+  },
+  plugins: [jisonPlugin()],
+  test: {
+    environment: 'jsdom',
+    globals: true,
+    setupFiles: ['src/tests/setup.ts'],
+  },
+});