AST traversal

Handler on node entrance, i.e. before any nested node is processed.

ast traversal api applies only on dist code(css) related ast

In fact tiny-sass-compiler's source code generation depends on the same traverse as plugin

Detail usage can refer to

/src/__tests__/plugin.spec.ts

or source code generator:

/src/genCodeVisitor.ts

Todos

refer to

• babel-types
• babel-template

reference

• https://github.com/csstree/csstree/blob/master/docs/traversal.md
• https://github.com/jamiebuilds/babel-handbook/blob/master/translations/en/plugin-handbook.md#toc-visitors