Revert some unwanted changes

Author: remcohaszing

lib/postcss.d.ts

@@ -25,18 +25,18 @@ import LazyResult from './lazy-result.js'
 import Processor from './processor.js'
 
 type DocumentProcessor = (
-  document: postcss.Document,
+  document: Document,
   helper: postcss.Helpers
 ) => Promise<void> | void
-type RootProcessor = (root: postcss.Root, helper: postcss.Helpers) => Promise<void> | void
+type RootProcessor = (root: Root, helper: postcss.Helpers) => Promise<void> | void
 type DeclarationProcessor = (
-  decl: postcss.Declaration,
+  decl: Declaration,
   helper: postcss.Helpers
 ) => Promise<void> | void
-type RuleProcessor = (rule: postcss.Rule, helper: postcss.Helpers) => Promise<void> | void
-type AtRuleProcessor = (atRule: postcss.AtRule, helper: postcss.Helpers) => Promise<void> | void
+type RuleProcessor = (rule: Rule, helper: postcss.Helpers) => Promise<void> | void
+type AtRuleProcessor = (atRule: AtRule, helper: postcss.Helpers) => Promise<void> | void
 type CommentProcessor = (
-  comment: postcss.Comment,
+  comment: Comment,
   helper: postcss.Helpers
 ) => Promise<void> | void