stream-chat-react-native-core/lib/module/components/MessageList/utils/buildMessageListWithNeighbours.js

The official React Native and Expo components for Stream Chat, a service for building chat applications

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getMessageListItemCacheKey = exports.buildMessageListWithNeighbours = void 0;
var getMessageListItemCacheKey = (item, index) => {
  if (item.id) {
    return item.id;
  }
  if (item.created_at) {
    return typeof item.created_at === 'string' ? item.created_at : item.created_at.toISOString();
  }
  return `index-${index}`;
};
exports.getMessageListItemCacheKey = getMessageListItemCacheKey;
var buildMessageListWithNeighbours = (processedMessageList, previousDerivedItems) => {
  var nextDerivedItems = new Map();
  var items = processedMessageList.map((message, index) => {
    var cacheKey = getMessageListItemCacheKey(message, index);
    var previousMessage = processedMessageList[index + 1];
    var nextMessage = processedMessageList[index - 1];
    var previousDerived = previousDerivedItems.get(cacheKey);
    if (previousDerived && previousDerived.message === message && previousDerived.previousMessage === previousMessage && previousDerived.nextMessage === nextMessage) {
      nextDerivedItems.set(cacheKey, previousDerived);
      return previousDerived;
    }
    var derivedItem = {
      nextMessage,
      previousMessage,
      message
    };
    nextDerivedItems.set(cacheKey, derivedItem);
    return derivedItem;
  });
  return {
    items,
    nextDerivedItems
  };
};
exports.buildMessageListWithNeighbours = buildMessageListWithNeighbours;
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