feat: new chord editor prototype

vite-plugin-lezer.ts

@@ -0,0 +1,19 @@
+import { buildParserFile } from "@lezer/generator";
+import type { Plugin, Rollup } from "vite";
+
+const fileRegex = /\.(grammar)$/;
+
+export function lezerGrammarPlugin() {
+  return {
+    name: "lezer-grammar",
+    transform(code, id) {
+      if (fileRegex.test(id)) {
+        return {
+          code: buildParserFile(code).parser,
+          map: null,
+        } satisfies Rollup.TransformResult;
+      }
+      return null;
+    },
+  } satisfies Plugin;
+}