title: how to get route table ID in typescript with AWS CDK
body: <pre><code>   // create a nat gateway 
     const natGateway = new ec2.CfnNatGateway(this, 'nat-gateway-1',{
        subnetId: mySubnet.subnetId,
        allocationId: new ec2.CfnEIP(this, 'eip-1', {
          domain: 'vpc'
        }).attrAllocationId
      })
      // create a route table
      const routeTable = new ec2.CfnRouteTable(this, 'route-table-1', {
        vpcId: vpc.vpcId,
      })
      // create route
      const route = new ec2.CfnRoute(this, 'route-1', {
        // how to get the route table id?
        routeTableId: 'how to get the id?',
        natGatewayId: 'how to get the id?',
        destinationCidrBlock: vpc.vpcCidrBlock
      })
  </code></pre>
  <p>When I create a route table or a nat gateway, how can I get the ID? I am working with typescript</p>