parser/mangler/compressor for ES6+ - CLI tool

 Terser is a parser, mangler, optimizer and beautifier toolkit
 for ECMAScript 2015 and newer (ES6+).
 .
 terser is a fork of uglify-es
 that retains API and CLI compatibility with uglify-es
 (Debian packages node-uglify-js, libjs-uglify-js, and uglifyjs).
 .
 ECMAScript 2015 (ES2015) a.k.a. ECMAScript 6 (ES6)
 is the 6th formal definition of JavaScript -
 a high-level, interpreted programming language
 most notably used in web browsers and in Node.js.
 .
 This package provides command-line tool uglifyjs.terser.