bigbuffet-rw/app/soapbox/reducers/profile_hover_card.js

import { Map as ImmutableMap } from 'immutable';

import {
  PROFILE_HOVER_CARD_OPEN,
  PROFILE_HOVER_CARD_CLOSE,
  PROFILE_HOVER_CARD_UPDATE,
} from 'soapbox/actions/profile_hover_card';

const initialState = ImmutableMap();

export default function profileHoverCard(state = initialState, action) {
  switch(action.type) {
  case PROFILE_HOVER_CARD_OPEN:
    return ImmutableMap({
      ref: action.ref,
      accountId: action.accountId,
    });
  case PROFILE_HOVER_CARD_UPDATE:
    return state.set('hovered', true);
  case PROFILE_HOVER_CARD_CLOSE:
    if (state.get('hovered') === true && !action.force)
      return state;
    else
      return ImmutableMap();
  default:
    return state;
  }
}