Fix type errors

lib/books.ts

@@ -2,19 +2,39 @@ import sqlite3 from "sqlite3";
 
 const DATABASE_PATH = "catalogue.db";
 
-async function getBook(id: number) {
+export async function getBook(id: number): Promise<DetailedBook> {
   const database = new sqlite3.Database(DATABASE_PATH, sqlite3.OPEN_READONLY);
+
   const sql =
     "SELECT isbn, lccn, title, subtitle, authors, edition, publisher, publish_year, publish_month, publish_location, pages, pagination, weight, last_updated, deleted FROM books WHERE id = ? ";
 
-  await database.get(sql, [id], (err: Error | null, book: DetailedBook) => {
-    if (err) {
-      return console.error(err.message);
-    }
-    console.log(book);
+  const book: Promise<DetailedBook> = new Promise((resolve, reject) => {
+    database.get(sql, [id], (err: Error | null, book: DetailedBook) => {
+      if (err) {
+        reject(err);
+      }
+      if (book) {
+        resolve(book);
+      } else {
+        reject(new Error("Not a valid id"));
+      }
+    });
   });
+  // .then((newBook) => {
+  //   book = new Promise((resolve) => {
+  //     resolve(newBook);
+  //   });
+  // })
+  // .catch((err) => {
+  //   console.error(err);
+  // })
+  // .finally(() => {
+  //   database.close();
+  // });
 
   database.close();
+
+  return book;
 }
 
 export interface DetailedBook {

pages/index.tsx

@@ -1,8 +1,19 @@
-import type { NextPage } from "next";
 import React from "react";
 
-const Home: NextPage = () => {
-  return <main>I am a book</main>;
-};
+import { getBook, DetailedBook } from "../lib/books";
 
-export default Home;
+export default function Home(props: Props) {
+  return <p>{props.book.title}</p>;
+}
+
+interface Props {
+  book: DetailedBook;
+}
+
+export async function getServerSideProps() {
+  return {
+    props: {
+      book: await getBook(2),
+    },
+  };
+}