Use mdast typings

Author: BarryThePenguin

types/index.d.ts

@@ -1,34 +1,10 @@
 // TypeScript Version: 3.0
 
-import {Node, Parent} from 'unist'
+import {Node} from 'unist'
+import {Parent, Heading, Link, Paragraph, List, ListItem} from 'mdast'
 import {Test} from 'unist-util-is'
 
 declare namespace mdastUtilToc {
-  interface Link extends Parent {
-    type: 'link'
-    title: null
-    url: string
-    children: Node[]
-  }
-
-  interface Paragraph extends Parent {
-    type: 'paragraph'
-    children: Link[]
-  }
-
-  interface ListItem extends Parent {
-    type: 'listItem'
-    loose: boolean
-    spread: boolean
-    children: Node[]
-  }
-
-  interface List extends Parent {
-    type: 'list'
-    ordered: boolean
-    spread: boolean
-    children: ListItem[]
-  }
 
   interface TOCOptions {
     heading?: string

types/mdast-util-toc-tests.ts

@@ -1,26 +1,10 @@
-import {Parent} from 'unist'
+import {Link, Paragraph, List, ListItem} from 'mdast'
 
 import unified = require('unified')
 import u = require('unist-builder')
 import is = require('unist-util-is')
 import toc = require('mdast-util-toc')
 
-interface Link extends Parent {
-  type: 'link'
-}
-
-interface Paragraph extends Parent {
-  type: 'paragraph'
-}
-
-interface List extends Parent {
-  type: 'list'
-}
-
-interface ListItem extends Parent {
-  type: 'listItem'
-}
-
 const tree = u('root', [
   u('heading', {depth: 1}, [u('text', 'Alpha')]),
   u('heading', {depth: 2}, [u('text', 'Bravo')]),