BREAKING CHANGE: Drop support for string refs #25454
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eps1lon
commented
Oct 9, 2022
| @@ -134,6 +134,7 @@ function validateExplicitKey(element, parentType) { | |||
| // assigning it a key. | |||
| let childOwner = ''; | |||
| if ( | |||
| __DEV__ && | |||
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Last place where element._owner is read I believe. Responsible for enhancing "should have unique key prop":
function InnerComponent({ childSet }) {
return <div>{childSet}</div>;
}
class App extends Component {
render() {
return <InnerComponent childSet={[<div />, <div />]} />;
}
}Warning: Each child in a list should have a unique "key" prop.
Check the render method of `InnerComponent`. It was passed a child from App. See https://reactjs.org/link/warning-keys for more information.
at div
at InnerComponent (https://cggv72.csb.app/src/index.js:14:3)
at App (https://cggv72.csb.app/src/index.js:23:1)-- https://codesandbox.io/s/warnings-with-owner-usage-cggv72
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this whole file is / should be dev-only
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|
Replaced by #28322 |
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Summary
Part of https://github.com/reactjs/rfcs/blob/createlement-rfc/text/0000-create-element-changes.md#deprecate-string-refs-and-remove-production-mode-_owner-field
Removes support for string refers which allows moving
_ownerto a non-enumerable, dev-only property (like_selfand_source)._owneris still used by other dev-only warnings.How did you test this change?