es-check validates JavaScript files against specific ECMAScript versions. It's a command-line tool that helps enforce code compatibility across projects targetting different environments (browsers, Node.js). Leveraging popular JavaScript parsers, es-check quickly identifies syntax errors or unsupported features based on the specified ECMAScript version. Useful for ensuring codebase consistency and preventing runtime errors due to incompatible JavaScript features. Simplifies cross-browser support and Node.js version management.