Locate Vue Components That Are Persisting

After loading my app and immediately taking a Chrome memory heap snapshot, I found the following results.

https://i.stack.imgur.com/QB8u3.png

Upon further exploration of my web app and then returning to the initial loaded page to take another memory heap snapshot, the results were quite different.

https://i.stack.imgur.com/vcCYq.png

It is evident that there has been a significant increase in the number of VueComponents and Vue instances, approximately 10 times more than before. This surge is evidently impacting the app's memory usage greatly.

What tools or methods can be utilized to identify and address the components causing this issue by not being properly destroyed?

javascriptvue.jsmemoryvuejs2

Answer №1

Finding Orphaned Vue Components

After suspecting that memory issues were stemming from orphaned Vue components, I delved into the code to search for circular references and other potential culprits.

I needed a method to pinpoint the specific Vue components in order to streamline my investigation.

Utilizing Heap Snapshot Tool

Through some manual effort, I discovered an effective technique that involves using the Chrome dev tools' Heap snapshot feature.

By searching for detached elements within the Heap snapshot, I was able to identify items that had been removed from the DOM.

Note: Make sure to compile Vue in development mode for this method to work properly.

https://i.stack.imgur.com/5orRg.png

This list of detached elements allowed me to select and inspect each one individually.

https://i.stack.imgur.com/JnnNC.png

Using the Chrome dev tools console and entering $0, I could access detailed information about the selected element.

https://i.stack.imgur.com/cGldA.png

Through this process, I identified the email input on my login page as the likely culprit and proceeded to investigate why it was not being properly destroyed.

Final Thoughts

While this method is useful for uncovering lingering components, it's important to consider the context of your application before deeming all detached nodes as problematic memory leaks.

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