Clear intervals to avoid detached components and memory leaks#331
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prc5
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Jan 24, 2023
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Hello 👋
As part of our project, we are using Facebook's new Memlab tool to detect memory leaks in SPA applications.
While running the tool and analyzing the code of react-zoom-pan-pinch, we saw that your project does a very good job of ensuring that all async operations are cancelled when the component unmounts. However, as per Memlab execution results, we found some dangling intervals that were causing the memory to leak (screenshots below).
[before]
Hence we added the fix by clearing the intervals and you can see the # of leaks reducing noticeably:
You can analyze this and other potential leak sources, if you like, by running Memlab with a scenario file covering maximum # of use cases.
Following is a sample of the scenario file we used (it needs to be a .js file but attaching here in .txt form):
test-scenario-menlab-rzpp.txt
Note that some other reported leaks (in Memlab) originated from React's internal objects, hence were ignored.