fix(vanilla): check duplicated instances

[dai-shi]

Related Issues or Discussions

Fixes #2044

Summary

Add a DEV-only warning message if duplication is detected.

Check List

• yarn run prettier for formatting code and docs

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Name	Status	Preview	Updated (UTC)
jotai	✅ Ready (Inspect)	Visit Preview	Jul 27, 2023 1:35pm

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Latest deployment of this branch, based on commit 0e47efb:

Sandbox	Source
React	Configuration
React Typescript	Configuration
React Browserify	Configuration
React Snowpack	Configuration
Next.js	Configuration
Next.js with custom Babel config	Configuration
React with custom Babel config	Configuration

[github-actions]

Size Change: +432 B (+1%)

Total Size: 67.9 kB

Filename	Size	Change
dist/system/vanilla.development.js	3.96 kB	+147 B (+4%)
dist/umd/vanilla.development.js	4.71 kB	+137 B (+3%)
dist/vanilla.js	4.62 kB	+148 B (+3%)

ℹ️ View Unchanged

Filename	Size
dist/babel/plugin-debug-label.js	916 B
dist/babel/plugin-react-refresh.js	1.15 kB
dist/babel/preset.js	1.39 kB
dist/index.js	242 B
dist/react.js	1.05 kB
dist/react/utils.js	1.26 kB
dist/system/babel/plugin-debug-label.development.js	1.09 kB
dist/system/babel/plugin-debug-label.production.js	764 B
dist/system/babel/plugin-react-refresh.development.js	1.29 kB
dist/system/babel/plugin-react-refresh.production.js	935 B
dist/system/babel/preset.development.js	1.57 kB
dist/system/babel/preset.production.js	1.14 kB
dist/system/index.development.js	236 B
dist/system/index.production.js	167 B
dist/system/react.development.js	1.17 kB
dist/system/react.production.js	701 B
dist/system/react/utils.development.js	713 B
dist/system/react/utils.production.js	451 B
dist/system/utils.development.js	241 B
dist/system/utils.production.js	175 B
dist/system/vanilla.production.js	1.92 kB
dist/system/vanilla/utils.development.js	4.51 kB
dist/system/vanilla/utils.production.js	2.76 kB
dist/umd/babel/plugin-debug-label.development.js	1.07 kB
dist/umd/babel/plugin-debug-label.production.js	850 B
dist/umd/babel/plugin-react-refresh.development.js	1.29 kB
dist/umd/babel/plugin-react-refresh.production.js	1.02 kB
dist/umd/babel/preset.development.js	1.53 kB
dist/umd/babel/preset.production.js	1.25 kB
dist/umd/index.development.js	381 B
dist/umd/index.production.js	329 B
dist/umd/react.development.js	1.18 kB
dist/umd/react.production.js	785 B
dist/umd/react/utils.development.js	1.42 kB
dist/umd/react/utils.production.js	1.03 kB
dist/umd/utils.development.js	398 B
dist/umd/utils.production.js	343 B
dist/umd/vanilla.production.js	2.12 kB
dist/umd/vanilla/utils.development.js	5.24 kB
dist/umd/vanilla/utils.production.js	3.23 kB
dist/utils.js	246 B
dist/vanilla/utils.js	5.1 kB

_{compressed-size-action}