fix jison generation

.esbuild/jison.js

@@ -0,0 +1,18 @@
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const { transformJison } = require('./jisonTransformer');
+const fileRegex = /\.(jison)$/;
+
+export default function jison() {
+  return {
+    name: 'jison',
+
+    transform(src, id) {
+      if (fileRegex.test(id)) {
+        return {
+          code: transformJison(src),
+          map: null, // provide source map if available
+        };
+      }
+    },
+  };
+}

.esbuild/jisonTransformer.js

@@ -0,0 +1,14 @@
+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}`;
+};

.esbuild/util.cjs

@@ -1,4 +1,4 @@
-const { Generator } = require('jison');
+const { transformJison } = require('./jisonTransformer');
 const fs = require('fs');
 const { dependencies } = require('../package.json');
 
@@ -91,9 +91,7 @@ const jisonPlugin = {
     build.onLoad({ filter: /\.jison$/ }, async (args) => {
       // Load the file from the file system
       const source = await fs.promises.readFile(args.path, 'utf8');
-      const contents = new Generator(source, { 'token-stack': true }).generate({
-        moduleMain: '() => {}', // disable moduleMain (default one requires Node.JS modules)
-      });
+      const contents = transformJison(source);
       return { contents, warnings: [] };
     });
   },