Transform code base to typescript

Change-Id: Ia1f862fb5962ddd54b8d7643abbc39bb314d1f8e

src/components/AvatarField.test.tsx

@@ -0,0 +1,17 @@
+import { RecordContextProvider } from "react-admin";
+import { render, screen } from "@testing-library/react";
+import AvatarField from "./AvatarField";
+
+describe("AvatarField", () => {
+  it("shows image", () => {
+    const value = {
+      avatar: "foo",
+    };
+    render(
+      <RecordContextProvider value={value}>
+        <AvatarField source="avatar" />
+      </RecordContextProvider>
+    );
+    expect(screen.getByRole("img").getAttribute("src")).toBe("foo");
+  });
+});