Use PostCSS 5.0

[ai]

Seems like postcss.parse broke a AST in PostCSS 5.0 (because your plugin depends on PostCSS 4.x and uses 4.x parser, which generates 4.x nodes).

Can you update PostCSS in dependencies?

/cc @MoOx

[ai]

We add special hook fo 4.x plugin in PostCSS 5.0, but I found a bad place in postcss-import:

nodes.splice.apply(nodes, [nodes.indexOf(atRule), 0].concat(newNodes))

By the many reasons, changing nodes directly is not a good way :).

[MoOx]

I used a low level array manipulation because of all the bug the cloning methods were introducing.

[MoOx]

Closed by 0626939