refactor(crnl): split the index file (#688)

### Summary The previous `index.ts` file of `create-react-native-library` was too long and complicated to maintain. This PR splits the file a bit ### Test plan 1. We have to make sure that the behavior hasn't changed at all. CI pipeline is the best way to check this.

Author: atlj

packages/create-react-native-library/src/utils/addCodegenBuildScript.ts renamed to packages/create-react-native-library/src/exampleApp/addCodegenBuildScript.ts

@@ -0,0 +1,46 @@
+import assert from 'node:assert';
+import path from 'path';
+import fs from 'fs-extra';
+import type { ExampleApp } from '../input';
+
+export async function getDependencyVersionsFromExampleApp(
+ folder: string,
+ exampleAppType: ExampleApp
+) {
+ const examplePackageJson = await fs.readJSON(
+ path.join(folder, 'example', 'package.json')
+ );
+
+ const react: string = examplePackageJson.dependencies?.react;
+ assert(
+ react !== undefined,
+ "The generated example app doesn't have React installed."
+ );
+ const reactNative: string = examplePackageJson.dependencies?.['react-native'];
+ assert(
+ reactNative !== undefined,
+ "The generated example app doesn't have React Native installed."
+ );
+
+ const devDependencies: Record<string, string> = {
+ react,
+ 'react-native': reactNative,
+ };
+
+ if (exampleAppType === 'vanilla') {
+ // React Native doesn't provide the community CLI as a dependency.
+ // We have to get read the version from the example app and put to the root package json
+ const exampleCommunityCLIVersion =
+ examplePackageJson.devDependencies['@react-native-community/cli'];
+ assert(
+ exampleCommunityCLIVersion !== undefined,
+ "The generated example app doesn't have community CLI installed"
+ );
+
+ devDependencies['@react-native-community/cli'] = exampleCommunityCLIVersion;
+ }
+
+ return {
+ devDependencies,
+ };
+}

packages/create-react-native-library/src/exampleApp/dependencies.ts

@@ -1,10 +1,9 @@
 import fs from 'fs-extra';
 import path from 'path';
 import https from 'https';
-import { spawn } from './spawn';
-import sortObjectKeys from './sortObjectKeys';
-
-export type ExampleType = 'vanilla' | 'test-app' | 'expo' | 'none';
+import { spawn } from '../utils/spawn';
+import sortObjectKeys from '../utils/sortObjectKeys';
+import type { ExampleApp } from '../input';
 
 const FILES_TO_DELETE = [
  '__tests__',
@@ -50,7 +49,7 @@ export default async function generateExampleApp({
  bobVersion,
  reactNativeVersion = 'latest',
 }: {
- type: ExampleType;
+ type: ExampleApp;
  dest: string;
  arch: 'new' | 'mixed' | 'legacy';
  project: {