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depsEquals.js
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depsEquals.js
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function depsEquals(
nextDeps,
prevDeps
) {
if (__DEV__) {
if (ignorePreviousDependencies) {
// Only true when this component is being hot reloaded.
return false;
}
}
if (prevDeps === null) {
if (__DEV__) {
console.error(
'%s received a final argument during this render, but not during ' +
'the previous render. Even though the final argument is optional, ' +
'its type cannot change between renders.',
currentHookNameInDev,
);
}
return false;
}
if (__DEV__) {
// Don't bother comparing lengths in prod because these arrays should be
// passed inline.
if (nextDeps.length !== prevDeps.length) {
console.error(
'The final argument passed to %s changed size between renders. The ' +
'order and size of this array must remain constant.\n\n' +
'Previous: %s\n' +
'Incoming: %s',
currentHookNameInDev,
`[${prevDeps.join(', ')}]`,
`[${nextDeps.join(', ')}]`,
);
}
}
for (let i = 0; i < prevDeps.length && i < nextDeps.length; i++) {
if (Object.is(nextDeps[i], prevDeps[i])) {
continue;
}
return false;
}
return true;
}