Remove support for non-nodes

Author: wooorm

lib/index.js

@@ -16,12 +16,9 @@
  */
 export function labelable(node) {
   return Boolean(
-    node &&
-      typeof node === 'object' &&
-      node.type === 'element' &&
+    node.type === 'element' &&
       (node.tagName === 'button' ||
-        (node.tagName === 'input' &&
-          (node.properties && node.properties.type) !== 'hidden') ||
+        (node.tagName === 'input' && node.properties.type !== 'hidden') ||
         node.tagName === 'keygen' ||
         node.tagName === 'meter' ||
         node.tagName === 'output' ||

test.js

@@ -9,11 +9,6 @@ test('labelable', async function (t) {
     ])
   })
 
-  await t.test('should return `false` without node', async function () {
-    // @ts-expect-error: check that the runtime supports a missing node.
-    assert.equal(labelable(), false)
-  })
-
   await t.test('should return `false` without element', async function () {
     assert.equal(labelable({type: 'text', value: 'Alpha'}), false)
   })