comments option preserved all jsdoc style comments

[jdalton]

The comments options is preserving all jsdoc style comments, even when they don't contain @license or @preserve.

uglifyJS.OutputStream({
   'comments': true
});

[mishoo]

Indeed, this is by design actually.. Passing comments: true will retain all comments. The filtering for JSDoc-style comments is done in the CLI tool, see https://github.com/mishoo/UglifyJS2/blob/master/bin/uglifyjs#L130

So to keep only comments that contain @preserve or @license you'd pass a regexp:

comments: /@license|@preserve/

[jdalton]

The docs made me think that "comments": "all" would preserve all comments and so setting it to true would auto preserve comments with @license or @preserve.