Fix types for changes in @types/unist

Author: wooorm

test.js

@@ -1,59 +1,90 @@
+/**
+ * @typedef {import('mdast').Root} Root
+ * @typedef {import('mdast').Text} Text
+ * @typedef {Root['children'][number]|Root} Node
+ */
+
+import assert from 'node:assert'
 import test from 'tape'
 import remark from 'remark'
 import {VFile} from 'vfile'
 import {source} from './index.js'
 
 test('unist-util-source', function (t) {
   var file = new VFile('> + **[Hello](./example)**\n> world.')
+  /** @type {Node} */
+  // @ts-expect-error: hush.
   var node = remark().parse(file)
 
   t.equal(source(node, file), '> + **[Hello](./example)**\n> world.', 'root')
 
+  assert(node.type === 'root')
   node = node.children[0]
+  assert(node.type === 'blockquote')
   t.equal(
     source(node, file),
     '> + **[Hello](./example)**\n> world.',
     'block quote'
   )
 
   node = node.children[0]
+  assert(node.type === 'list')
   t.equal(source(node, file), '+ **[Hello](./example)**\n> world.', 'list')
 
   node = node.children[0]
+  assert(node.type === 'listItem')
   t.equal(source(node, file), '+ **[Hello](./example)**\n> world.', 'list item')
 
   node = node.children[0]
+  assert(node.type === 'paragraph')
   t.equal(source(node, file), '**[Hello](./example)**\n> world.', 'paragraph')
 
   node = node.children[0]
+  assert(node.type === 'strong')
   t.equal(source(node, file), '**[Hello](./example)**', 'strong')
 
   node = node.children[0]
+  assert(node.type === 'link')
   t.equal(source(node, file), '[Hello](./example)', 'link')
 
   node = node.children[0]
+  assert(node.type === 'text')
   t.equal(source(node, file), 'Hello', 'text')
 
-  t.equal(source({type: node.type, value: node.value}, file), null, 'generated')
+  t.equal(
+    source(/** @type {Text} */ ({type: node.type, value: node.value}), file),
+    null,
+    'generated'
+  )
 
   t.equal(source(null, file), null, 'missing')
 
   file = new VFile('a\r\nb')
-  node = remark().parse(file).children[0]
+  // @ts-expect-error: hush.
+  node = remark().parse(file)
+  assert(node.type === 'root')
+  node = node.children[0]
+  assert(node.type === 'paragraph')
 
   t.equal(source(node, file), 'a\r\nb', 'cr + lf')
 
   file = new VFile('a\rb')
-  node = remark().parse(file).children[0]
+  // @ts-expect-error: hush.
+  node = remark().parse(file)
+  assert(node.type === 'root')
+  node = node.children[0]
+  assert(node.type === 'paragraph')
 
   t.equal(source(node, file), 'a\rb', 'cr')
 
   file = new VFile('a\n')
+  // @ts-expect-error: hush.
   node = remark().parse(file)
 
   t.equal(source(node, file), 'a\n', 'eof eol')
 
   file = new VFile('a\n\rb')
+  // @ts-expect-error: hush.
   node = remark().parse(file)
 
   t.equal(source(node, file), 'a\n\rb', 'blank lines')