Fix useCallback not work properly in shallow renderer

[chenesan]

Fix #15774 .
Just copy and paste the same logic as useMemo in shallow renderer; Not sure if it's better to extract the comparison logic into common function or just keep it repeat.

[sizebot]

Details of bundled changes.

Comparing: 3b23022...b067a9f

react-test-renderer

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-test-renderer.development.js	0.0%	-0.0%	530.77 KB	530.77 KB	113.62 KB	113.61 KB	UMD_DEV
ReactShallowRenderer-dev.js	+1.9%	+0.2%	34.79 KB	35.43 KB	8.74 KB	8.76 KB	FB_WWW_DEV
react-test-renderer.development.js	0.0%	-0.0%	526.31 KB	526.31 KB	112.5 KB	112.5 KB	NODE_DEV
react-test-renderer.production.min.js	0.0%	-0.0%	62.91 KB	62.91 KB	19.32 KB	19.32 KB	NODE_PROD
react-test-renderer-shallow.development.js	+1.5%	+0.1%	41.84 KB	42.47 KB	10.82 KB	10.84 KB	UMD_DEV
react-test-renderer-shallow.production.min.js	🔺+2.6%	-0.1%	11.6 KB	11.9 KB	3.55 KB	3.54 KB	UMD_PROD
react-test-renderer-shallow.development.js	+1.7%	+0.1%	35.98 KB	36.6 KB	9.45 KB	9.46 KB	NODE_DEV
react-test-renderer-shallow.production.min.js	🔺+2.6%	-0.0%	11.74 KB	12.05 KB	3.67 KB	3.67 KB	NODE_PROD

Generated by 🚫 dangerJS

[chenesan]

@threepointone @gaearon sorry for pinging. any news on this?

[threepointone]

I don't think we're going to add this functionality to the shallow renderer for now, sorry. I truly appreciate the effort.

[ljharb]

@threepointone why not?

[threepointone]

Sorry, I think I read the conclusion on the linked task wrongly. I'll reopen this, but I'm still not certain what our plans are for adding this to the shallow renderer.

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contribution.

[ljharb]

This isn't stale, it's just that collaborators haven't made a decision yet.

(Please don't use stalebots, they're incredibly user-hostile)

[gaearon]

The shallow renderer has moved to https://github.com/NMinhNguyen/react-shallow-renderer. If this is still relevant, please feel free to file this issue there. Thanks!