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/element-text-string.tsx

@@ -0,0 +1,15 @@
+/** @jsx jsx */
+import { jsx } from 'slate-hyperscript'
+
+export const input = (
+  <element>
+    <text>word</text>
+  </element>
+)
+export const output = {
+  children: [
+    {
+      text: 'word',
+    },
+  ],
+}