Warn when second callback is passed to setState/dispatch in Hooks#14625
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gaearon merged 1 commit intofacebook:masterfrom Jan 18, 2019
Merged
Warn when second callback is passed to setState/dispatch in Hooks#14625gaearon merged 1 commit intofacebook:masterfrom
gaearon merged 1 commit intofacebook:masterfrom
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gaearon
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Jan 18, 2019
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| if (__DEV__) { | ||
| warning( | ||
| arguments.length <= 3, |
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Could've been === 3 but I figured I don't want to punish users for our bugs.
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It's supported in classes and not in Hooks. People try to pass it and wonder why it doesn't work. Now we warn for that. This also lets us add it (or something else) later as a second argument.