message-selectors.ts

// gets the channel id of the currently selected channel
export const selectCurrentChannelId = createSelector(
    selectMessagesState,
    getSelectedChannelId
);

export const selectMessageEntities = createSelector(
    selectMessagesState,
    selectMessageContainerEntities
);

// Gets messages for the currently selected channel
export const selectCurrentChannelMessages = createSelector(
    selectMessageEntities,
    selectCurrentChannelId,
    (messageEntities, channelId) => messageEntities[channelId].messages
  );