code: function buildRoute(
    name,
    position,
    { NatGatewayId = null, GatewayId = null, InstanceId = null } = {},
  ) {
    const route = {
      Type: 'AWS::EC2::Route',
      Properties: {
        DestinationCidrBlock: '0.0.0.0/0',
        RouteTableId: {
          Ref: `${name}RouteTable${position}`,
        },
      },
    };
  
    if (NatGatewayId) {
      route.Properties.NatGatewayId = {
        Ref: NatGatewayId,
      };
    } else if (GatewayId) {
      route.Properties.GatewayId = {
        Ref: GatewayId,
      };
    } else if (InstanceId) {
      route.Properties.InstanceId = {
        Ref: InstanceId,
      };
    } else {
      throw new Error(
        'Unable to create route: either NatGatewayId, GatewayId or InstanceId must be provided',
      );
    }
  
    const cfName = `${name}Route${position}`;
    return {
      [cfName]: route,
    };
  }
docs: Build a Route for a NatGateway or InternetGateway
  
  @param {String} name
  @param {Number} position
  @param {Object} params
  @return {Object}