import { Parser } from '@nomicfoundation/slang/parser';
import { SourceUnit } from '@nomicfoundation/slang/ast';
import { NonterminalKind } from '@nomicfoundation/slang/cst';

const source = `
pragma solidity ^0.8.0;
`;
const parser = Parser.create('0.8.28');
const parseOutput = parser.parse(NonterminalKind.SourceUnit, source);
parseOutput.isValid(); // true

const ast = new SourceUnit(parseOutput.tree.asNonterminalNode()!);

console.log(ast.cst.kind); // SourceUnit
console.log(ast.members.cst.kind); // SourceUnitMembers
console.log(ast.cst.kind); // Resource error: Not a valid "NonterminalNode" resource.