Pass fabric_enabled flag to control whether to generate fabric components

Summary:
There will still be a case where this script is used when fabric is disabled. This diff adds the flag so that whether to generate fabric components can be controlled by the user.

Changelog: [internal]

Reviewed By: cortinico

Differential Revision: D32380881

fbshipit-source-id: 786931848b1eca5015c8f58f4361b395c8d341cc

scripts/generate-artifacts.js

@@ -42,12 +42,19 @@ const argv = yargs
     description:
       'The key that contains the codegen configuration in the config file.',
   })
+  .option('e', {
+    alias: 'fabricEnabled',
+    default: true,
+    description: 'A flag to control whether to generate fabric components.',
+    boolean: 'e',
+  })
   .usage('Usage: $0 -p [path to app]')
   .demandOption(['p']).argv;
 
 const RN_ROOT = path.join(__dirname, '..');
 const CODEGEN_CONFIG_FILENAME = argv.f;
 const CODEGEN_CONFIG_KEY = argv.k;
+const CODEGEN_FABRIC_ENABLED = argv.e;
 const CODEGEN_REPO_PATH = `${RN_ROOT}/packages/react-native-codegen`;
 const CODEGEN_NPM_PATH = `${RN_ROOT}/../react-native-codegen`;
 const CORE_LIBRARIES = new Set(['rncore', 'FBReactNativeSpec']);
@@ -157,6 +164,9 @@ function main(appRootDir, outputPath) {
 
     // 5. For each codegen-enabled library, generate the native code spec files
     libraries.forEach(library => {
+      if (!CODEGEN_FABRIC_ENABLED && library.config.type === 'components') {
+        return;
+      }
       const tmpDir = fs.mkdtempSync(
         path.join(os.tmpdir(), library.config.name),
       );

scripts/react_native_pods.rb

@@ -286,8 +286,9 @@ def use_react_native_codegen_discovery!(options={})
   Pod::UI.warn '[Codegen] warn: using experimental new codegen integration'
   react_native_path = options[:react_native_path] ||= "../node_modules/react-native"
   app_path = options[:app_path]
+  fabric_enabled = options[:fabric_enabled] ||= false
   if app_path
-    Pod::Executable.execute_command('node', ["#{react_native_path}/scripts/generate-artifacts.js", "-p", "#{app_path}", "-o", Pod::Config.instance.installation_root])
+    Pod::Executable.execute_command('node', ["#{react_native_path}/scripts/generate-artifacts.js", "-p", "#{app_path}", "-o", Pod::Config.instance.installation_root, "-e", "#{fabric_enabled}"])
   else
     Pod::UI.warn '[Codegen] error: no app_path was provided'
     exit 1