npm run build fails in Forge production - FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory

It seems like you're encountering an out-of-memory issue when trying to build your project with Vite on your AWS EC2 instance. This can happen when the build process requires more memory than what is available on the machine. Here are a few steps you can take to try and resolve this issue:

1. Increase the Memory of the EC2 Instance: If you're running on a small instance, you might simply need more RAM. Consider upgrading to a larger instance type with more memory.

2. Optimize Your Build: If increasing the memory isn't an option or doesn't solve the issue, you can try to optimize your build process. This can include:

   • Breaking down large components into smaller chunks.
   • Analyzing your bundle to remove or split heavy dependencies.
   • Using dynamic imports to lazy-load parts of your application.

3. Increase Node's Memory Limit: You've already tried increasing the memory limit, but it's possible that the limit wasn't applied correctly. Make sure to set the NODE_OPTIONS environment variable before running the build command. You can do this by running the following command in your SSH session before starting the build:

   export NODE_OPTIONS=--max-old-space-size=4096
   npm run build
   

   Alternatively, you can modify your package.json scripts to include the memory limit:

   "scripts": {
     "build": "node --max-old-space-size=4096 node_modules/vite/bin/vite.js build"
   }
   

4. Check for Memory Leaks: Sometimes, a memory leak in your code or one of the dependencies can cause out-of-memory issues. Use tools like the Chrome Developer Tools to profile your application and look for leaks.

5. Splitting Vendors: Your current manual chunking strategy seems to be on the right track. However, you might want to refine it further by splitting out more chunks if possible, especially for large libraries.

6. Server Configuration: Ensure that your server configuration isn't limiting the amount of memory that processes can use. Check the ulimit settings and other related configurations.

7. Build Locally and Upload: As a last resort, if you're unable to resolve the memory issues on the server, you could build the project on your local machine (assuming it has sufficient resources) and then upload the built assets to your server.

Here's an example of how you might adjust your vite.config.js to further optimize chunk splitting:

export default {
  build: {
    rollupOptions: {
      output: {
        manualChunks(id) {
          if (id.includes('node_modules')) {
            // Split each node_modules dependency into its own chunk
            return `vendor_${id.toString().split('node_modules/')[1].split('/')[0]}`;
          }
        },
        // Consider setting a max file size to split larger chunks
        chunkFileNames: 'assets/[name]-[hash].js',
      },
    },
    // Adjust the chunk size warning limit if necessary
    chunkSizeWarningLimit: 500, // This value is in KB
  },
};

Remember to replace 500 with the appropriate chunk size warning limit for your project.

If none of these solutions work, consider reaching out to the Vite community or checking the Vite GitHub issues for similar problems and potential solutions. It's also worth checking if there are any known issues with the specific version of Vite or Node.js you are using.