const InputStream = require('antlr4').InputStream;
const CommonTokenStream = require('antlr4').CommonTokenStream;
const YAMLLexer = require('antlr4-parsers/yaml/YAMLLexer').YAMLLexer;
const YAMLParser = require('antlr4-parsers/yaml/YAMLParser').YAMLParser;
 
const yml = `
key: value
key2: value2
`;
 
const stream = new InputStream(yml);
const lexer = new YAMLLexer(stream);
const tokenStream = new CommonTokenStream(lexer);
const parser = new YAMLParser(tokenStream);
 
const root = parser.yaml();
 
console.log(root); // Output the root