@babel/plugin-proposal-private-methods enables the use of private methods and accessors in JavaScript classes, adhering to the relevant ECMAScript proposal. Private methods enhance encapsulation by preventing access from outside the class. Utilizing #methodName() for private methods and accessors, this plugin transforms the code into compatible JavaScript, improving code maintainability and future-proofing class structures while supporting modern development practices. Incorporate this to leverage private features in your babel pipeline.