Possibility to analyze memory leaks/usage in Jest

[tmkasun]

Hi Team,

First of all, Thank you very much for making this project open source, AFAIK there are very few opensource tools like memlab to analyze memory leaks in SPA apps, Hope this will be an excellent help for frontend developers to identify memory leaks in the Single Page Apps.

My question is, Is it possible to analyze the memory usage or leaks in tests written using the Jest framework?

[JacksonGL]

MemLab tests its APIs with Jest. Please check out the src/__test__ folder of each memlab packages for more examples.

To find memory leaks in SPA using Jest, here is one example: https://github.com/facebookincubator/memlab/blob/main/packages/api/src/__tests__/API/E2EFindMemoryLeaks.test.ts (more examples under the packages/api/src/__tests__ folder)

If you would like to analyze memory in node.js, MemLab provides the following APIs:

• Take heap snapshot from node.js: https://facebookincubator.github.io/memlab/docs/api/modules/heap_analysis_src/#takenodefullheap
• Analyzing the heap snapshot in graph view: https://facebookincubator.github.io/memlab/docs/api/interfaces/core_src.IHeapSnapshot/

Here is an example of using MemLab with Jest: https://facebookincubator.github.io/memlab/docs/api/interfaces/core_src.IHeapSnapshot/#hasobjectwithtagtag

[tmkasun]

Thank you very much @JacksonGL for the quick response, I will have a look at the MemLab tests and other materials.

[derN3rd]

I think the question was more like "Is there any way/functionality already that allows us to throw this tool onto our jest tests to find memory leaks in it".

At least thats my question, but after reading through the code, docs and examples I couldn't find anything.