docs(examples): react-native: update .gitignore to exclude lib folder (TanStack#3196)

Author: arnaudbzn

examples/react-native/.gitignore

@@ -87,3 +87,5 @@ buck-out/
 web-build/
 
 # @end expo-cli
+
+!lib

examples/react-native/src/lib/api.ts

@@ -0,0 +1,39 @@
+import movies from '../data/movies.json';
+
+export type Movie = {
+  title: string;
+  year: number;
+};
+
+export type MovieDetails = Movie & {
+  info: {
+    plot: string;
+    actors: string[];
+  };
+};
+
+function delay(t: number, v: () => void) {
+  return new Promise(function (resolve) {
+    setTimeout(resolve.bind(null, v), t);
+  });
+}
+
+export async function fetchMovies() {
+  console.log('fetchMovies');
+  return delay(200 + Math.floor(Math.random() * 2000), () =>
+    movies
+      .slice(0, 100)
+      .map((movie) => ({ title: movie.title, year: movie.year }))
+  ) as Promise<Movie[]>;
+}
+
+export async function fetchMovie(title: string) {
+  console.log('fetchMovie', title);
+  return delay(200 + Math.floor(Math.random() * 2000), () => {
+    const result = movies.filter((item) => item.title === title);
+    if (result.length == 0) {
+      throw new Error('Movie not found');
+    }
+    return result[0];
+  }) as Promise<MovieDetails>;
+}