Changed to P/S

Author: mattpocock

src/09-external-libraries/73-react-hook-form.explainer.tsx renamed to src/09-external-libraries/73-react-hook-form.problem.tsx

@@ -37,7 +37,7 @@ const Example1 = () => {
  */
 
 const Example2 = () => {
-  const form = useForm({});
+  const form = useForm();
 
   return (
     <form

src/09-external-libraries/73-react-hook-form.solution.tsx

@@ -0,0 +1,39 @@
+import { FieldValues, useForm } from "react-hook-form";
+import { Equal, Expect } from "../helpers/type-utils";
+
+const Example1 = () => {
+  const form = useForm({
+    values: {
+      firstName: "",
+      lastName: "",
+    },
+  });
+
+  return (
+    <form
+      onSubmit={form.handleSubmit((values) => {
+        type test = Expect<
+          Equal<typeof values, { firstName: string; lastName: string }>
+        >;
+      })}
+    >
+      <input {...form.register("firstName")} />
+      <input {...form.register("lastName")} />
+    </form>
+  );
+};
+
+const Example2 = () => {
+  const form = useForm();
+
+  return (
+    <form
+      onSubmit={form.handleSubmit((values) => {
+        type test = Expect<Equal<typeof values, FieldValues>>;
+      })}
+    >
+      <input {...form.register("firstName")} />
+      <input {...form.register("lastName")} />
+    </form>
+  );
+};