Add an ignoreResults option to the useSubscription API

[jpvajda]

Overview

Some issues have been brought to our attention that the useSubscription API doesn't have an option of ignoreResults, similar to the useMutation API.

Issue

Unfortunately, unlike useMutation, there is no "magic parameter" like ignoreResults, and a component will be rendered each time you get new data on subscription. useSubscription returns a value, and because it does, that means we need to update it, which requires components to re-render. Whereas useMutation allows someone to avoid the re-renders by passing an ignoreResults option.

Purpose

We could offer an ignoreResults option in useSubscription which would not return a value from useSubscription thereby avoiding re-renders This would be useful to allow a developer to to not re-render a component on certain occasions if they wish.

Details

• Name: ignoreResults
• Type boolean
• Functionality: If true, the subscription's data property is not updated with the subscription's result.
• Default: false

References

• https://stackoverflow.com/questions/61876931/how-to-prevent-re-rendering-with-usesubscription
• https://dagster.io/blog/web-workers-performance-issue
• https://medium.com/@seniv/improve-performance-of-your-react-apollo-application-440692e37026

[kjhuang-db]

+10000

[phryneas]

This has been implemented in #11921 and will be released in Apollo Client 3.11.

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