[compiler] What is IfNode and NodeTypes.IF

[marekvospel]

In the declarations of @vue/compiler-sfc I've noticed there is a Node called IfNode, which confused me, as vue uses directives for conditional rendering. (v-if)

While exploring the output of @vue/compiler-sfc I found that indeed, v-if directive are directives, and that there is no IfNode in the output ast.

Looking trough the code of @vue/compiler-core, I've found a parseWithIfTransform function in the tests, that transforms the ast and adds IfNode. (use)

That made me think that IfNode is just a testing node, and that it can't be returned by @vue/compiler-core or @vue/compiler-sfc and others.

Is that correct? Or is there a way to enable the ifTransform or get the IfNode in the parse results?