55           const mergedId = merge.mergedTransaction.id;  constant
57           this.addMerge(originalId, mergedId);
65   addMerge(originalId, mergedId) {
66     const merge = new Merge(originalId, mergedId, this.history);
98           _generateHistoryTree(event.mergedId, event.mergedAt);
99         const mergeTreeNode = new MergeTreeNode(event.mergedId, historyTree);
129         allTransactionsMergedIn.add(event.mergedId);
150       .map((merge) => merge.mergedId);
155   mergedId: Number;  property in MergeTreeNode
159   constructor(mergedId, mergedTransactionHistory) {
160     this.mergedId = mergedId;
184   mergedId: Number;  property in Merge
187   constructor(originalId, mergedId, history) {
189     this.mergedId = mergedId;
192     this.mergedAt = history[mergedId]?.length ?? 0;