Choices/assets/scripts/src/reducers/items.js

const items = (state = [], action) => {
  switch (action.type) {
    case 'ADD_ITEM': {
      // Add object to items array
      const newState = [...state, {
        id: action.id,
        choiceId: action.choiceId,
        groupId: action.groupId,
        value: action.value,
        label: action.label,
        active: true,
        highlighted: false,
        customProperties: action.customProperties
      }];

      return newState.map((item) => {
        if (item.highlighted) {
          item.highlighted = false;
        }
        return item;
      });
    }

    case 'REMOVE_ITEM': {
      // Set item to inactive
      return state.map((item) => {
        if (item.id === action.id) {
          item.active = false;
        }
        return item;
      });
    }

    case 'HIGHLIGHT_ITEM': {
      return state.map((item) => {
        if (item.id === action.id) {
          item.highlighted = action.highlighted;
        }
        return item;
      });
    }

    default: {
      return state;
    }
  }
};

export default items;