babel-plugin-transform-es2015-typeof-symbol is a Babel plugin transforming ES2015 typeof Symbol() code into ES5 compatible code. It normalizes the behavior of typeof Symbol() across different JavaScript environments, ensuring consistent results even in environments lacking native Symbol support. This plugin avoids errors in older browsers where typeof Symbol() might incorrectly throw an error. Using this plugin is essential for maintaining cross-browser compatibility when working with ES2015 Symbols.