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KeyValueChangeRecord

interface

Record representing the item change information.

interface KeyValueChangeRecord<K, V> {
  key: K
  currentValue: V | null
  previousValue: V | null
}

Property	Description
`key: K`	Read-Only Current key in the Map.
`currentValue: V \| null`	Read-Only Current value for the key or `null` if removed.
`previousValue: V \| null`	Read-Only Previous value for the key or `null` if added.

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https://v12.angular.io/api/core/KeyValueChangeRecord