toDomainId+'".');}
return transformer;},getTransformerBetween_(fromDomainId,toDomainId){const visitedDomainIds=new Set();const queue=[{domainId:fromDomainId,transformer:Transformer.IDENTITY}];while(queue.length>0){queue.sort((domain1,domain2)=>domain1.transformer.error-domain2.transformer.error);const current=queue.shift();if(current.domainId===toDomainId){return current.transformer;}
if(visitedDomainIds.has(current.domainId)){continue;}