Introduce forceSyncUpdate to class component

[jzhan-canva]

Summary

As described in issue #28897, there is currently no reliable API for a class component to be updated in SyncLane. This API is desired when a class component is subscribed to an external store, e.g. mobx.

Function component can achieve this reliably by using useSyncExternalStore. However, class component may be updated at an arbitrary time.

How did you test this change?

No implement at the moment

[react-sizebot]

Comparing: d779eba...cec73c1

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.66 kB	6.66 kB	=	1.82 kB	1.82 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.67 kB	6.67 kB	=	1.83 kB	1.83 kB
facebook-www/ReactDOM-prod.classic.js	+0.07%	591.11 kB	591.50 kB	+0.02%	103.94 kB	103.96 kB
facebook-www/ReactDOM-prod.modern.js	+0.07%	567.33 kB	567.73 kB	+0.03%	100.34 kB	100.37 kB
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable-semver/react/cjs/react.development.js	+1.66%	93.48 kB	95.03 kB	+0.36%	25.60 kB	25.69 kB
oss-stable/react/cjs/react.development.js	+1.66%	93.50 kB	95.05 kB	+0.37%	25.63 kB	25.72 kB
oss-experimental/react/cjs/react.development.js	+1.63%	95.17 kB	96.72 kB	+0.40%	26.01 kB	26.11 kB
facebook-react-native/react/cjs/React-dev.js	+1.37%	113.13 kB	114.68 kB	+0.35%	29.43 kB	29.53 kB
facebook-www/React-dev.modern.js	+1.33%	116.14 kB	117.69 kB	+0.34%	30.11 kB	30.21 kB
facebook-www/React-dev.classic.js	+1.33%	116.63 kB	118.18 kB	+0.34%	30.22 kB	30.32 kB
oss-stable-semver/react/cjs/react.production.js	+1.07%	16.87 kB	17.05 kB	+0.48%	4.39 kB	4.41 kB
oss-stable/react/cjs/react.production.js	+1.07%	16.89 kB	17.07 kB	+0.43%	4.42 kB	4.44 kB
oss-experimental/react/cjs/react.production.js	+1.00%	18.01 kB	18.20 kB	+0.41%	4.68 kB	4.70 kB
facebook-react-native/react/cjs/React-prod.js	+0.83%	21.88 kB	22.06 kB	+0.30%	5.74 kB	5.75 kB
facebook-react-native/react/cjs/React-profiling.js	+0.81%	22.32 kB	22.50 kB	+0.33%	5.81 kB	5.83 kB
facebook-www/React-prod.modern.js	+0.80%	22.68 kB	22.86 kB	+0.39%	5.84 kB	5.86 kB
facebook-www/React-prod.classic.js	+0.80%	22.68 kB	22.86 kB	+0.38%	5.84 kB	5.86 kB
facebook-www/React-profiling.modern.js	+0.78%	23.12 kB	23.30 kB	+0.39%	5.92 kB	5.94 kB
facebook-www/React-profiling.classic.js	+0.78%	23.12 kB	23.30 kB	+0.37%	5.92 kB	5.94 kB
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Generated by 🚫 dangerJS against cec73c1

[github-actions]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.

[github-actions]

Closing this pull request after a prolonged period of inactivity. If this issue is still present in the latest release, please ask for this pull request to be reopened. Thank you!