Initial import with skill sheet working

node_modules/is-what/test/index.test.js

@@ -0,0 +1,15 @@
+// @ts-check
+import {
+  isBlob,
+  isFile,
+} from '../dist/index.cjs'
+
+test('isBlob', () => {
+  expect(isBlob(Blob)).toBe(false)
+  expect(isBlob(new Blob())).toBe(true)
+})
+
+test('isFile', () => {
+  expect(isFile(File)).toBe(false)
+  expect(isFile(new File([''], '', { type: 'text/html' }))).toBe(true)
+})