using js-to-ts converter on JSX. (#3906)

Added 'include' parameter to tsconfig to tell the compiler to only look inside the src directory

packages/slate-hyperscript/test/fixtures/fragment-element.tsx

@@ -0,0 +1,17 @@
+/** @jsx jsx */
+import { jsx } from 'slate-hyperscript'
+
+export const input = (
+  <fragment>
+    <element>word</element>
+  </fragment>
+)
+export const output = [
+  {
+    children: [
+      {
+        text: 'word',
+      },
+    ],
+  },
+]