Function isASTNode

packages/lang-core/src/parser/ast.ts:104–107

(value: unknown)

/** Check if a value is an AST node (has a valid `k` discriminant field). */
export function isASTNode(value: unknown): value is ASTNode {
  if (!value || typeof value !== "object" || Array.isArray(value)) return false;
  return AST_KINDS.has((value as Record<string, unknown>).k as string);
}

export function walkAST(node: ASTNode, visit: (node: ASTNode) => void): void {
  const walk = (current: ASTNode) => {