code: function hasDuplicateDependentKeys(callExp) {
    if (!isComputedProp(callExp)) return false;
  
    const dependentKeys = parseDependentKeys(callExp);
    const uniqueKeys = dependentKeys
      .filter((val, index, self) => self.indexOf(val) === index);
  
    return uniqueKeys.length !== dependentKeys.length;
  }
docs: Checks whether a computed property has duplicate dependent keys.
  
  @param  {CallExpression} callExp Given call expression
  @return {Boolean}        Flag whether dependent keys present.