Refactor loadJsonFile import and add new implementation

- Updated import paths for loadJsonFile in ReactOnRailsRSC and getReactServerComponent to use the new local loadJsonFile.ts module.
- Removed the old loadJsonFile reference from package.json in react-on-rails.
- Introduced a new loadJsonFile.ts file in react-on-rails-pro with functionality to load and cache JSON files.

These changes improve modularity and ensure the correct loading of JSON files in the new package structure.

Author: AbanoubGhadban

packages/react-on-rails-pro/src/ReactOnRailsRSC.ts

@@ -31,7 +31,7 @@ import {
   StreamingTrackers,
   transformRenderStreamChunksToResultObject,
 } from './streamServerRenderedReactComponent.ts';
-import loadJsonFile from 'react-on-rails/loadJsonFile';
+import loadJsonFile from './loadJsonFile.ts';
 
 let serverRendererPromise: Promise<ReturnType<typeof buildServerRenderer>> | undefined;
 

packages/react-on-rails-pro/src/getReactServerComponent.server.ts

@@ -15,7 +15,7 @@
 import { BundleManifest } from 'react-on-rails-rsc';
 import { buildClientRenderer } from 'react-on-rails-rsc/client.node';
 import transformRSCStream from './transformRSCNodeStream.ts';
-import loadJsonFile from 'react-on-rails/loadJsonFile';
+import loadJsonFile from './loadJsonFile.ts';
 import type { RailsContextWithServerStreamingCapabilities } from 'react-on-rails/types';
 
 type GetReactServerComponentOnServerProps = {

packages/react-on-rails-pro/src/loadJsonFile.ts

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2025 Shakacode LLC
+ *
+ * This file is NOT licensed under the MIT (open source) license.
+ * It is part of the React on Rails Pro offering and is licensed separately.
+ *
+ * Unauthorized copying, modification, distribution, or use of this file,
+ * via any medium, is strictly prohibited without a valid license agreement
+ * from Shakacode LLC.
+ *
+ * For licensing terms, please see:
+ * https://github.com/shakacode/react_on_rails/blob/master/REACT-ON-RAILS-PRO-LICENSE.md
+ */
+
+import * as path from 'path';
+import * as fs from 'fs/promises';
+
+type LoadedJsonFile = Record<string, unknown>;
+const loadedJsonFiles = new Map<string, LoadedJsonFile>();
+
+export default async function loadJsonFile<T extends LoadedJsonFile = LoadedJsonFile>(
+  fileName: string,
+): Promise<T> {
+  // Asset JSON files are uploaded to node renderer.
+  // Renderer copies assets to the same place as the server-bundle.js and rsc-bundle.js.
+  // Thus, the __dirname of this code is where we can find the manifest file.
+  const filePath = path.resolve(__dirname, fileName);
+  const loadedJsonFile = loadedJsonFiles.get(filePath);
+  if (loadedJsonFile) {
+    return loadedJsonFile as T;
+  }
+
+  try {
+    const file = JSON.parse(await fs.readFile(filePath, 'utf8')) as T;
+    loadedJsonFiles.set(filePath, file);
+    return file;
+  } catch (error) {
+    console.error(`Failed to load JSON file: ${filePath}`, error);
+    throw error;
+  }
+}

packages/react-on-rails/package.json

@@ -53,7 +53,6 @@
     "./ReactOnRails.full": "./lib/ReactOnRails.full.js",
     "./handleError": "./lib/handleError.js",
     "./serverRenderUtils": "./lib/serverRenderUtils.js",
-    "./loadJsonFile": "./lib/loadJsonFile.js",
     "./buildConsoleReplay": "./lib/buildConsoleReplay.js",
     "./ReactDOMServer": "./lib/ReactDOMServer.cjs"
   },