Function isBuiltin

packages/lang-core/src/parser/builtins.ts:215–217

(name: string)

/** Check if a name is a builtin function (not a component) */
export function isBuiltin(name: string): boolean {
  return BUILTIN_NAMES.has(name);
}

/** Reserved statement-level call names — not builtins, not components */
export const RESERVED_CALLS = { Query: "Query", Mutation: "Mutation" } as const;