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Move React Map child check to behind flags or __DEV__ #17995

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Merged
trueadm merged 1 commit into from
Feb 7, 2020
Merged

Move React Map child check to behind flags or __DEV__ #17995

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21 changes: 11 additions & 10 deletions packages/react/src/ReactChildren.js
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Original file line number Diff line number Diff line change
Expand Up @@ -159,17 +159,18 @@ function traverseAllChildrenImpl(
} else {
const iteratorFn = getIteratorFn(children);
if (typeof iteratorFn === 'function') {
if (iteratorFn === children.entries) {
if (disableMapsAsChildren) {
invariant(
false,
'Maps are not valid as a React child (found: %s). Consider converting ' +
'children to an array of keyed ReactElements instead.',
children,
);
}
if (disableMapsAsChildren) {
invariant(
iteratorFn !== children.entries,
'Maps are not valid as a React child (found: %s). Consider converting ' +
'children to an array of keyed ReactElements instead.',
children,
);
}

if (__DEV__) {
// Warn about using Maps as children
if (__DEV__) {
if (iteratorFn === children.entries) {
if (!didWarnAboutMaps) {
console.warn(
'Using Maps as children is deprecated and will be removed in ' +
Expand Down