Скачать или смотреть Fixing JavaScript heap out of memory Error When Building Angular Projects

Learn how to resolve the common error `FATAL ERROR: MarkCompactCollector: young object promotion failed` in Angular projects due to memory allocation issues.
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Resolving the JavaScript heap out of memory Error in Angular Builds

If you’re developing with Angular, you may have run into a frustrating issue: the JavaScript heap out of memory error. This problem often presents itself when you try to build your Angular project, especially if you are utilizing Angular 12 combined with libraries like PrimeNG. In this guide, we will introduce you to the error and walk you through the steps to effectively troubleshoot and resolve this issue.

Understanding the Error

When building an Angular project, specifically when using the command ng build, you may encounter the following error:

[[See Video to Reveal this Text or Code Snippet]]

This message typically indicates that the Node.js process has run out of memory when trying to allocate space for objects. The underlying issue may stem from a syntax error in your code or insufficient memory allocation settings in your Node.js environment.

Common Symptoms

The build process hangs or fails and returns the error message.

It occurs without significant changes to the project, such as installing new packages or modifying configurations.

Troubleshooting Steps

To get past this error, follow these steps to identify and fix the root cause of the problem.

Step 1: Increase Node.js Memory Limits

One common solution is to increase the memory allocation for Node.js processes. This can be done with the following command:

[[See Video to Reveal this Text or Code Snippet]]

This command increases the available heap memory size to 8192 MB. However, sometimes this alone may not resolve the issue.

Step 2: Reviewing the Code for Syntax Errors

Upon further investigation, it’s important to examine your code for potential syntax errors. Even if no recent changes were made, there may be issues that weren’t previously triggered.

Example of a Problematic Code Snippet

For instance, consider the following Angular template snippet:

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If you notice, the problem here is with the formatting of the ngModel binding, where the date pipe is used.

Step 3: Simplify the Affected Code

To resolve the error, you can simplify the binding. Here’s how you can modify the p-calendar code:

[[See Video to Reveal this Text or Code Snippet]]

By removing the | date:'dd/MM/yyyy hh:mm a', the project compiles without triggering the memory error.

Step 4: Rebuild Your Project

After making these changes, run your build command again:

[[See Video to Reveal this Text or Code Snippet]]

If successful, you should see the compilation complete without the dreaded memory error.

Conclusion

Dealing with the JavaScript heap out of memory error can be tricky, but with the right approach, you can troubleshoot and resolve the issue. Remember to check your code for syntax errors and don’t hesitate to adjust your Node.js memory settings when working with resource-intensive applications like Angular.

For ongoing development, keep an eye on the memory usage of your projects and regularly refactor to ensure efficiency. Happy coding!