Set up development environment

src/App.tsx

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+import React from "react";
+import styles from "./styles/App.module.css";
+
+const App: React.FC = () => {
+  console.log("test");
+  return (
+    <div>
+      <h1 className={styles.title}>Hello, world</h1>
+    </div>
+  );
+};
+
+export default App;

src/custom.d.ts

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+declare module "*.svg" {
+  const content: string;
+  export default content;
+}
+
+declare module "*.module.css" {
+  const classes: { [key: string]: string };
+  export default classes;
+}

src/index.tsx

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+import React from "react";
+import ReactDOM from "react-dom";
+import App from "./App";
+
+ReactDOM.render(<App />, document.getElementById("root"));

src/styles/App.module.css

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+.title {
+  color: red;
+}