[fix]: Expressions doesn't work with `posthtml-extend`

[mikestopcontinues]

Problem

posthtml-extend updates the tree to be contained within the extended page. For some reason, this breaks posthtml-expressions. But it would be awesome to both use the plugins together, as well as use expressions logic in the extended template.

Reproduction

Two different issues:

1. Try to use expressions within a template that extends another.
2. Try to use expressions within a template that is extended by another.

Expressions work so long as you don't try to extend the current template.

[Scrum]

@mikestopcontinues Hi, thanks for your feedback, I'll check it out soon.

[Scrum]

@mikestopcontinues wait merge and publish PR

[mikestopcontinues]

Thanks, @GitScrum! You rock!

[michael-ciniawsky]

@mikestopcontinues Can you show your current posthtml config and the plugin order ?

[mikestopcontinues]

Sure!

posthtml([
  extend({root}),
  modules({root}),
  include({root}),
  expressions(),
]);

[Scrum]

Now you need set extend options plugins when call expressions

posthtml([
  extend({root, plugins: [expressions()]}),
  modules({root}),
  include({root}),
  expressions(),
]);

[mikestopcontinues]

Ok, thanks!

[Scrum]

@mikestopcontinues wait publish in npm )

[michael-ciniawsky]

Does posthtml-extend (not too familiar with it 😛 ) not also extend the tree (AST), so posthtml-expressions should normally work if it is used after posthtml-extend ? We use a custom walk {Function} in posthtml-expressions atm, maybe there is something lost during interpolation ?

[Scrum]

@mikestopcontinues Done! enjoy, and close this issue if all good.

[mikestopcontinues]

Thanks!