Function findChanges

packages/db/src/local-storage.ts:712–744

(
    oldData: Map<string | number, StoredItem<T>>,
    newData: Map<string | number, StoredItem<T>>,
  )

   * @returns Array of changes with type, key, and value information
   */
  const findChanges = (
    oldData: Map<string | number, StoredItem<T>>,
    newData: Map<string | number, StoredItem<T>>,
  ): Array<{
    type: `insert` | `update` | `delete`
    key: string | number
    value?: T
  }> => {
    const changes: Array<{
      type: `insert` | `update` | `delete`
      key: string | number
      value?: T
    }> = []

    // Check for deletions and updates
    oldData.forEach((oldStoredItem, key) => {
      const newStoredItem = newData.get(key)
      if (!newStoredItem) {
        changes.push({ type: `delete`, key, value: oldStoredItem.data })
      } else if (oldStoredItem.versionKey !== newStoredItem.versionKey) {
        changes.push({ type: `update`, key, value: newStoredItem.data })
      }
    })

    // Check for insertions
    newData.forEach((newStoredItem, key) => {
      if (!oldData.has(key)) {
        changes.push({ type: `insert`, key, value: newStoredItem.data })
      }
    })

    return changes
  }

  /**
   * Process storage changes and update collection