text: // redux-observable compatible operator
  export function ofType(...keys) {
    return this.filter(({ type }) => {
      const len = keys.length;
      if (len === 1) {
        return type === keys[0];
      } else {
        for (let i = 0; i < len; i++) {
          if (keys[i] === type) {
            return true;
          }
        }
      }
      return false;
    });
  }
  
  export default function getActionsOfType(actions, ...types) {
    const length = types.length;
    return actions
      .filter(({ type }) => {
        if (length === 1) {
          return type === types[0];
        }
        return types.some(_type => _type === type);
      });
  }
  