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Fixed possible undefined error in TreeContext reducer #24501

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merged 1 commit into from
May 5, 2022
Merged

Fixed possible undefined error in TreeContext reducer #24501

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10 changes: 4 additions & 6 deletions packages/react-devtools-shared/src/devtools/views/Components/TreeContext.js
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Original file line number Diff line number Diff line change
Expand Up @@ -377,12 +377,11 @@ function reduceTreeState(store: Store, state: State, action: Action): State {
}
break;
case 'SELECT_PREVIOUS_ELEMENT_WITH_ERROR_OR_WARNING_IN_TREE': {
if (store.errorCount === 0 && store.warningCount === 0) {
const elementIndicesWithErrorsOrWarnings = store.getElementsWithErrorsAndWarnings();
if (elementIndicesWithErrorsOrWarnings.length === 0) {
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It doesn't make as much sense to check store.errorCount and store.warningCount here because we don't use those values. We use the tuples array returned by getElementsWithErrorsAndWarnings – and while this should always match up, it seems like a small improvement to make this reducer check the actual value it uses rather than the one it's derived from.

return state;
}

const elementIndicesWithErrorsOrWarnings = store.getElementsWithErrorsAndWarnings();

let flatIndex = 0;
if (selectedElementIndex !== null) {
// Resume from the current position in the list.
Expand Down Expand Up @@ -419,12 +418,11 @@ function reduceTreeState(store: Store, state: State, action: Action): State {
break;
}
case 'SELECT_NEXT_ELEMENT_WITH_ERROR_OR_WARNING_IN_TREE': {
if (store.errorCount === 0 && store.warningCount === 0) {
const elementIndicesWithErrorsOrWarnings = store.getElementsWithErrorsAndWarnings();
if (elementIndicesWithErrorsOrWarnings.length === 0) {
return state;
}

const elementIndicesWithErrorsOrWarnings = store.getElementsWithErrorsAndWarnings();

let flatIndex = -1;
if (selectedElementIndex !== null) {
// Resume from the current position in the list.
Expand Down