babel-plugin-transform-es2015-for-of transforms ES2015 "for...of" loops into ES5-compatible code. This plugin ensures modern JavaScript's iterable looping structure functions correctly in older browsers and environments lacking native "for...of" support. By converting "for...of" loops to equivalent ES5 code using iterators, it maintains consistent behavior across different JavaScript runtimes, enabling wider compatibility for your Babel-compiled code. It's crucial for projects targeting broad browser support.