Fix jest

src/jison/transformer.cjs

@@ -0,0 +1,8 @@
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const { Generator } = require('jison');
+
+module.exports = {
+  process(sourceText, sourcePath, options) {
+    return { code: new Generator(sourceText, options.transformerConfig).generate() };
+  },
+};