Is transform still supported in the version 3?

[OndrejSpanel]

Is UglifyJS.transform and TreeTransformer (see lisperator.net) still supported in the version 3, or was it removed in #1872? It specifically mentions walk as supported, but there is no mention about transform:

AST node class names, utility functions, and traversers like TreeWalker can remain as is, as some uglify users analyze the AST.

I am using transform heavily and after upgrading to 3 it seems not working to me. It may be because I do something wrong (I am using UglifyJS from Scala.js, therefore the things are not straightforward for me). Walker works for me fine.

Before I inspect this in more detail, may I ask if transform removal was intentional?

[alexlamsl]

AST_Node.transform() is still exported because AST_Node is, but only TreeWalker, not TreeTransformer, is being exported.

It is intentional only in the sense that we are aiming to reduce the API surface area with UglifyJS 3. Feel free to submit a PR to export TreeTransformer around here:

https://github.com/mishoo/UglifyJS2/blob/4f8ca4626efb15dc986785c89c51cbb3061e5f32/tools/exports.js#L2

[alexlamsl]

I also noticed that we never had any documentation for TreeWalker and TreeTransformer, not even back in 2.x

[mishoo]

@alexlamsl There is some documentation on my website: TreeWalker and TreeTransformer. Unless there is a good reason to break or hide these API-s, I'd like them to stay…

[alexlamsl]

@mishoo noted - will add that one-liner to expose TreeTransformer 😉

Those APIs haven't changed at all from v2.x, so I think I can safely link to your documentation pages.