babel-plugin-transform-es2015-literals transforms ES2015 unicode code point and hexadecimal literals to ES5 compatible code. Specifically, it converts unicode literals like \u{FFFF} and hexadecimal literals like 0xFFFF into their corresponding decimal representations. This ensures broader compatibility across older browsers and environments that may not fully support ES2015 features. Using this Babel plugin allows developers to leverage modern JavaScript syntax while maintaining wider browser support.