fix[codegen]: patch generation directory as described in facebook/rea…

…ct-native#45079

package.json

@@ -36,7 +36,7 @@
 		"build:types": "tsc --emitDeclarationOnly --declaration --declarationDir lib/types",
 		"build:cjstypes": "tsc -p tsconfig.commonjs.json",
 		"build:esmtypes": "tsc -p tsconfig.module.json",
-		"codegen": "npx @react-native-community/cli codegen",
+		"codegen": "npx @react-native-community/cli codegen && node utils/patchCodegen.mjs",
 		"build": "npm run build:babel && npm run build:types && npm run codegen",
 		"prepare": "npm run clean && npm run build"
 	},
@@ -73,6 +73,7 @@
 		"@react-native-community/cli": "15.0.0",
 		"@types/react": "^18.2.44",
 		"del-cli": "^5.1.0",
+		"fs-extra": "^11.2.0",
 		"react": "18.3.1",
 		"react-native": "0.76.1",
 		"react-native-builder-bob": "^0.30.3",
@@ -87,7 +88,7 @@
 	},
 	"codegenConfig": {
 		"name": "RNGetDeviceLocaleSpec",
-		"type": "all",
+		"type": "modules",
 		"jsSrcsDir": "src",
 		"outputDir": {
 			"ios": "ios/generated",

utils/patchCodegen.mjs

@@ -0,0 +1,96 @@
+// https://github.com/callstack/react-native-builder-bob/blob/a2024246378272b49f1727dc4395f2725f3bc616/packages/react-native-builder-bob/src/utils/patchCodegen.ts
+
+import fs from 'fs-extra';
+import path from 'path';
+
+/**
+ * Currently, running react-native codegen generates java files with package name `com.facebook.fbreact.specs`.
+ * This is a known issue in react-native itself.
+ * You can find the relevant line here: https://github.com/facebook/react-native/blob/dc460147bb00d6f912cc0a829f8040d85faeeb13/packages/react-native/scripts/codegen/generate-artifacts-executor.js#L459.
+ * To workaround, this function renames the package name to the one provided in the codegenConfig.
+ * @throws if codegenConfig.outputDir.android or codegenConfig.android.javaPackageName is not defined in package.json
+ * @throws if the codegenAndroidPath does not exist
+ */
+export async function patchCodegen() {
+
+	const projectPath = process.cwd();
+
+  const packageJsonPath = path.resolve(projectPath, 'package.json');
+  const packageJson = await fs.readJson(packageJsonPath);
+
+  let codegenAndroidPath =
+    packageJson.codegenConfig.outputDir.android;
+  if (!codegenAndroidPath) {
+    throw new Error(
+      'You need to define codegenConfig.outputDir.android in your package.json'
+    );
+  }
+  codegenAndroidPath = path.resolve(projectPath, codegenAndroidPath);
+
+  if (!(await fs.pathExists(codegenAndroidPath))) {
+    throw new Error(
+      `Could not find ${codegenAndroidPath}. Make sure you are in the correct directory and react-native codegen works properly.`
+    );
+  }
+
+  const codegenJavaPackageName =
+    packageJson.codegenConfig.android.javaPackageName;
+  if (!codegenJavaPackageName) {
+    throw new Error(
+      'You need to define codegenConfig.android.javaPackageName in your package.json'
+    );
+  }
+
+  const codegenJavaPath = path.resolve(
+    codegenAndroidPath,
+    `java/com/facebook/fbreact/specs`
+  );
+
+  // If this issue is ever fixed in react-native, this check will prevent the patching from running.
+  if (!(await fs.pathExists(codegenJavaPath))) {
+    console.log(
+      `Could not find ${codegenJavaPath}. Skipping patching codegen java files.`
+    );
+    return;
+  }
+
+  const javaFiles = await fs.readdir(codegenJavaPath);
+
+  await Promise.all(
+    javaFiles.map(async (file) => {
+      const filePath = path.resolve(codegenJavaPath, file);
+      const fileContent = await fs.readFile(filePath, 'utf8');
+
+      const newFileContent = fileContent.replace(
+        'package com.facebook.fbreact.specs',
+        `package ${codegenJavaPackageName}`
+      );
+
+      await fs.writeFile(filePath, newFileContent);
+    })
+  );
+
+  const newPackagePath = path.resolve(
+    codegenAndroidPath,
+    `java/${codegenJavaPackageName.replace(/\./g, '/')}`
+  );
+
+  if (!(await fs.pathExists(newPackagePath))) {
+    await fs.mkdir(newPackagePath, { recursive: true });
+  }
+
+  await Promise.all(
+    javaFiles.map(async (file) => {
+      const filePath = path.resolve(codegenJavaPath, file);
+      const newFilePath = path.resolve(newPackagePath, file);
+
+      await fs.rename(filePath, newFilePath);
+    })
+  );
+
+  await fs.rm(path.resolve(codegenAndroidPath, 'java/com/facebook'), {
+    recursive: true,
+  });
+}
+
+patchCodegen();