Fix for changes in @types/unist

Author: wooorm

test.js

@@ -1,3 +1,8 @@
+/**
+ * @typedef {import('mdast').Root} Root
+ */
+
+import assert from 'assert'
 import test from 'tape'
 import remark from 'remark'
 import {headingStyle} from './index.js'
@@ -18,95 +23,101 @@ test('headingStyle', function (t) {
     'should NOT fail on undetectable nodes'
   )
 
-  t.equal(
-    headingStyle(remark.parse('# ATX').children[0]),
-    'atx',
-    'should detect atx'
-  )
+  t.equal(headingStyle(parseFirstNode('# ATX')), 'atx', 'should detect atx')
 
   t.equal(
-    headingStyle(remark.parse('# ATX #').children[0]),
+    headingStyle(parseFirstNode('# ATX #')),
     'atx-closed',
     'should detect closed atx'
   )
 
   t.equal(
-    headingStyle(remark.parse('ATX\n===').children[0]),
+    headingStyle(parseFirstNode('ATX\n===')),
     'setext',
     'should detect closed setext'
   )
 
   t.equal(
-    headingStyle(remark.parse('### ATX').children[0]),
+    headingStyle(parseFirstNode('### ATX')),
     null,
     'should work on ambiguous nodes'
   )
 
   t.equal(
-    headingStyle(remark.parse('### ATX').children[0], 'atx'),
+    headingStyle(parseFirstNode('### ATX'), 'atx'),
     'atx',
     'should work on ambiguous nodes (preference to atx)'
   )
 
   t.equal(
-    headingStyle(remark.parse('### ATX').children[0], 'setext'),
+    headingStyle(parseFirstNode('### ATX'), 'setext'),
     'setext',
     'should work on ambiguous nodes (preference to setext)'
   )
 
   t.equal(
-    headingStyle(remark.parse('###### ######').children[0]),
+    headingStyle(parseFirstNode('###### ######')),
     'atx-closed',
     'should work on empty nodes (#1)'
   )
 
   t.equal(
-    headingStyle(remark.parse('### ###').children[0]),
+    headingStyle(parseFirstNode('### ###')),
     'atx-closed',
     'should work on empty nodes (#2)'
   )
 
   t.equal(
-    headingStyle(remark.parse('# #').children[0]),
+    headingStyle(parseFirstNode('# #')),
     'atx-closed',
     'should work on empty nodes (#3)'
   )
 
   t.equal(
-    headingStyle(remark.parse('###### ').children[0], 'atx'),
+    headingStyle(parseFirstNode('###### '), 'atx'),
     'atx',
     'should work on empty nodes (#4)'
   )
 
   t.equal(
-    headingStyle(remark.parse('### ').children[0], 'atx'),
+    headingStyle(parseFirstNode('### '), 'atx'),
     'atx',
     'should work on empty nodes (#5)'
   )
 
   t.equal(
-    headingStyle(remark.parse('## ').children[0]),
+    headingStyle(parseFirstNode('## ')),
     'atx',
     'should work on empty nodes (#6)'
   )
 
   t.equal(
-    headingStyle(remark.parse('###### ').children[0], 'setext'),
+    headingStyle(parseFirstNode('###### '), 'setext'),
     'setext',
     'should work on empty nodes (#7)'
   )
 
   t.equal(
-    headingStyle(remark.parse('### ').children[0], 'setext'),
+    headingStyle(parseFirstNode('### '), 'setext'),
     'setext',
     'should work on empty nodes (#8)'
   )
 
   t.equal(
-    headingStyle(remark.parse('## ').children[0], 'setext'),
+    headingStyle(parseFirstNode('## '), 'setext'),
     'atx',
     'should work on empty nodes (#9)'
   )
 
   t.end()
 })
+
+/**
+ * @param {string} doc
+ */
+function parseFirstNode(doc) {
+  const tree = /** @type {Root} */ (remark.parse(doc))
+  const head = tree.children[0]
+  assert(head.type === 'heading')
+  return head
+}