diff --git a/.esbuild/jisonTransformer.js b/.esbuild/jisonTransformer.js
deleted file mode 100644
index 5f89c6647..000000000
--- a/.esbuild/jisonTransformer.js
+++ /dev/null
@@ -1,14 +0,0 @@
-const { Generator } = require('jison');
-exports.transformJison = (src) => {
-  const parser = new Generator(src, {
-    moduleType: 'js',
-    'token-stack': true,
-  });
-  const source = parser.generate({ moduleMain: '() => {}' });
-  const exporter = `
-	parser.parser = parser;
-	export { parser };
-	export default parser;
-	`;
-  return `${source} ${exporter}`;
-};
diff --git a/src/jison/transformer.cjs b/src/jison/transformer.cjs
deleted file mode 100644
index 99fbcb9ee..000000000
--- a/src/jison/transformer.cjs
+++ /dev/null
@@ -1,8 +0,0 @@
-// eslint-disable-next-line @typescript-eslint/no-var-requires
-const { transformJison } = require('../../.esbuild/jisonTransformer.cjs');
-
-module.exports = {
-  process(sourceText, sourcePath, options) {
-    return { code: transformJison(sourceText) };
-  },
-};