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Avoid overwriting a set oneof field in target with an unset oneof field in source #395

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merged 1 commit into from Nov 15, 2022
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Avoid overwriting a set oneof field in target with an unset oneof field in source #395

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2 changes: 1 addition & 1 deletion packages/runtime/src/reflection-merge-partial.ts
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Expand Up @@ -37,7 +37,7 @@ export function reflectionMergePartial<T extends object>(info: MessageInfo, targ

if (field.oneof) {
const group = input[field.oneof] as UnknownOneofGroup | undefined; // this is the oneof`s group in the source
if (group == undefined) { // the user is free to omit
if (group?.oneofKind == undefined) { // the user is free to omit
continue; // we skip this field, and all other members too
}
fieldValue = group[name]; // our value comes from the the oneof group of the source
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