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Data: Warn if the 'useSelect' hook returns different values when called with the same state and parameters #53666

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merged 2 commits into from
Aug 15, 2023
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Data: Warn if the 'useSelect' hook returns different values when called with the same state and parameters #53666

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Try: Check values returned by the 'useSelect' hook for referential st…
Mamaduka Aug 15, 2023
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Mamaduka Aug 15, 2023
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14 changes: 14 additions & 0 deletions packages/data/src/components/use-select/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@ function Store( registry, suspense ) {
let lastMapResultValid = false;
let lastIsAsync;
let subscriber;
let didWarnUnstableReference;

const createSubscriber = ( stores ) => {
// The set of stores the `subscribe` function is supposed to subscribe to. Here it is
Expand Down Expand Up @@ -134,6 +135,19 @@ function Store( registry, suspense ) {
listeningStores
);

if ( process.env.NODE_ENV === 'development' ) {
if ( ! didWarnUnstableReference ) {
const secondMapResult = mapSelect( select, registry );
if ( ! isShallowEqual( mapResult, secondMapResult ) ) {
// eslint-disable-next-line no-console
console.warn(
`The 'useSelect' hook returns different values when called with the same state and parameters. This can lead to unnecessary rerenders.`
);
didWarnUnstableReference = true;
}
}
}

if ( ! subscriber ) {
subscriber = createSubscriber( listeningStores.current );
} else {
Expand Down
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