refactor: Fix types

packages/parser/src/index.ts

@@ -1,3 +1,12 @@
+import type { AstNode } from 'langium';
+
 export type { Info, Packet } from './language/index.js';
+export { MermaidParseError, parse } from './parse.js';
 export type { DiagramAST } from './parse.js';
-export { parse, MermaidParseError } from './parse.js';
+
+/**
+ * Exclude/omit all `AstNode` attributes recursively.
+ */
+export type RecursiveAstOmit<T> = T extends object
+  ? { [P in keyof T as Exclude<P, keyof AstNode>]: RecursiveAstOmit<T[P]> }
+  : T;