output.comments default behavior changed

[owiber]

In 1.2.4, it looks like the default behavior of output.comments changed from false to /^\**!|@preserve|@license|@cc_on/ if extractComments is disabled (which is the default case).

This seems to be a result of: #250.

Was this intentional? For large files, the new default behavior has quite a large negative impact on speed and memory usage.

[alexander-akait]

Yes it is expected, we should respect copyright and licenses of other developers. Also itry to read all license in you application, perhaps some of them are not in MIT and other you should provide license. Otherwise, you violate the license and the law. Therefore, the behavior has been changed.

You your known all you licenses and understand that they can be removed, use the options

uglifyOptions: {
        output: {
          comments: false
        }    
}

Also you can use extractComments: true it is extract comment to separable file. Thanks!