Currently appears as UglifyJS2 and Google Closure doesn't support JavaScript minification of scripts including async/await usage without transpiling them.
Is there a way or another minifier to get these JavaScript scripts minified without the need to transpile them?
UglifyJS introduced support for async/await in uglify-es@3.0.17 ( https://github.com/mishoo/UglifyJS2/issues/1789)