// Documentation of the options is available at https://github.com/mishoo/UglifyJS2 { parse: { bare_returns : false, ecma : 8, expression : false, filename : null, html5_comments : true, shebang : true, strict : false, toplevel : null }, compress: { arrows : true, booleans : true, collapse_vars : true, comparisons : true, computed_props : true, conditionals : true, dead_code : true, drop_console :