custom-domain.ts

const apiCertificate = getCertificate(this.domainName);
    this.apiDistribution = new aws.apigateway.DomainName(name, {
      domainName: this.domainName,
      endpointConfiguration: { types: "EDGE" },
      securityPolicy: "TLS_1_2",
      certificateArn: apiCertificate.apply(x => x.arn)
    });
    const hostedZone = getHostedZone(this.domainName);
    this.dnsRecord = new aws.route53.Record(name, {
      name: this.domainName,
      zoneId: hostedZone.apply(x => x.zoneId),
      type: "A",
      aliases: [
        {
          evaluateTargetHealth: true,
          name: this.apiDistribution.cloudfrontDomainName,
          zoneId: this.apiDistribution.cloudfrontZoneId
        }
      ]
    });
    this.mapping = new aws.apigateway.BasePathMapping(name, {
      restApi: this.gateway.restAPI,
      stageName: this.gateway.stage.stageName,
      domainName: this.apiDistribution.domainName,
      basePath: this.basePath
    });