bun.sh/test/integration/expo-app/scripts/reset-project.js

#!/usr/bin/env node

/**
 * This script is used to reset the project to a blank state.
 * It moves the /app directory to /app-example and creates a new /app directory with an index.tsx and _layout.tsx file.
 * You can remove the `reset-project` script from package.json and safely delete this file after running it.
 */

const fs = require("fs");
const path = require("path");

const root = process.cwd();
const oldDirPath = path.join(root, "app");
const newDirPath = path.join(root, "app-example");
const newAppDirPath = path.join(root, "app");

const indexContent = `import { Text, View } from "react-native";

export default function Index() {
  return (
    <View
      style={{
        flex: 1,
        justifyContent: "center",
        alignItems: "center",
      }}
    >
      <Text>Edit app/index.tsx to edit this screen.</Text>
    </View>
  );
}
`;

const layoutContent = `import { Stack } from "expo-router";

export default function RootLayout() {
  return (
    <Stack>
      <Stack.Screen name="index" />
    </Stack>
  );
}
`;

fs.rename(oldDirPath, newDirPath, error => {
  if (error) {
    return console.error(`Error renaming directory: ${error}`);
  }
  console.log("/app moved to /app-example.");

  fs.mkdir(newAppDirPath, { recursive: true }, error => {
    if (error) {
      return console.error(`Error creating new app directory: ${error}`);
    }
    console.log("New /app directory created.");

    const indexPath = path.join(newAppDirPath, "index.tsx");
    fs.writeFile(indexPath, indexContent, error => {
      if (error) {
        return console.error(`Error creating index.tsx: ${error}`);
      }
      console.log("app/index.tsx created.");

      const layoutPath = path.join(newAppDirPath, "_layout.tsx");
      fs.writeFile(layoutPath, layoutContent, error => {
        if (error) {
          return console.error(`Error creating _layout.tsx: ${error}`);
        }
        console.log("app/_layout.tsx created.");
      });
    });
  });
});