Strip comments

Although I am using the UglifyJS plugin and have options turned on, I still get some comments in the code like /*! ... */. I want to strip my entire output of any comment. How can I do that?

Kind regards, Ingwie.

[agundermann]

new webpack.optimize.UglifyJsPlugin({
    output: {
        comments: false
    }
})

[IngwiePhoenix]

I get them stripped now. This is my config for Uglifyjs. The only place where comments are left, is CSS.

module.exports = {
    compress: {
        warnings: false,
        properties: true,
        sequences: true,
        dead_code: true,
        conditionals: true,
        comparisons: true,
        evaluate: true,
        booleans: true,
        unused: true,
        loops: true,
        hoist_funs: true,
        cascade: true,
        if_return: true,
        join_vars: true,
        //drop_console: true,
        drop_debugger: true,
        unsafe: true,
        hoist_vars: true,
        negate_iife: true,
        //side_effects: true
    },
    //sourceMap: true,
    mangle: {
        toplevel: true,
        sort: true,
        eval: true,
        properties: true
    },
    output: {
        space_colon: false,
        comments: function(node, comment) {
            var text = comment.value;
            var type = comment.type;
            if (type == "comment2") {
                // multiline comment
                return /@copyright/i.test(text);
            }
        }
    }
}

Notice the function there - that does the trick. It only leaves comments with @copyright in. All others are goners.