Function recordDuplicateKeys

packages/core/src/render3/list_reconciliation.ts:75–83

(keyToIdx: Map<unknown, Set<number>>, key: unknown, idx: number)

}

function recordDuplicateKeys(keyToIdx: Map<unknown, Set<number>>, key: unknown, idx: number): void {
  const idxSoFar = keyToIdx.get(key);

  if (idxSoFar !== undefined) {
    idxSoFar.add(idx);
  } else {
    keyToIdx.set(key, new Set([idx]));
  }
}

/**
 * The live collection reconciliation algorithm that perform various in-place operations, so it