I m getting `There was an error synthesizing your app` when

Question

I m getting `There was an error synthesizing your app` when performing a `yarn run start` I ve deployed this app many times and this is the first time I m seeing this However I can manually `sst build` and `sst deploy` followed by an `sst remove` to remove the deployed app This appears to be limited to the live lambda dev environment

Seth Geoghegan · Answer

Perhaps it s related to the CDKv2 migration Not sure what to make of the wall of output ``` lib interpreter y6Y1OWkN py3 8 knock attribution service git develop yarn run start yarn run v1 22 11 $ AWS PROFILE=CC Non Prod CC Engineering ReadWrite AWS SDK LOAD CONFIG=1 sst start stage whoami Using stage whoami Preparing your SST app ======================= Deploying debug stack ======================= Users sgeoghegan dev knock attribution service node modules aws cdk lib core lib stack js 1 use strict var a Object defineProperty exports esModule value 0 exports rootPathTo=exports Stack=exports STACK RESOURCE LIMIT CONTEXT=void 0 const jsiiDeprecationWarnings=require warnings jsii js JSII RTTI SYMBOL 1=Symbol for jsii rtti fs=require fs path=require path cxschema=require cloud assembly schema cxapi=require cx api constructs 1=require constructs annotations 1=require annotations app 1=require app arn 1=require arn cfn element 1=require cfn element cfn fn 1=require cfn fn cfn pseudo 1=require cfn pseudo cfn resource 1=require cfn resource context provider 1=require context provider feature flags 1=require feature flags cloudformation lang 1=require private cloudformation lang logical id 1=require private logical id resolve 1=require private resolve uniqueid 1=require private uniqueid STACK SYMBOL=Symbol for aws cdk core Stack MY STACK CACHE=Symbol for aws cdk core Stack myStack exports STACK RESOURCE LIMIT CONTEXT= aws cdk core stackResourceLimit const VALID STACK NAME REGEX= ^ A Za z A Za z0 9 $ MAX RESOURCES=500 class Stack extends constructs 1 Construct constructor scope id props= var b c d jsiiDeprecationWarnings aws cdk lib StackProps props scope=scope =null scope new autoSynth 1 outdir fs 1 FileSystem mkdtemp cdk test app id=id =null id Default super scope id this missingContext=new Array this stackDependencies= this templateOptions= Object defineProperty this STACK SYMBOL value 0 this logicalIds=new logical id 1 LogicalIDs const account region environment =this parseEnvironment props env if this account=account this region=region this environment=environment this terminationProtection=props terminationProtection props description ==void 0 if props description length gt 512 throw new Error `Stack description must be lt = 1024 bytes Received description $ props description ` this templateOptions description=props description if this stackName= b=props stackName ==null amp amp b ==void 0 b this generateStackName this tags=new tag manager 1 TagManager cfn resource 1 TagType KEY VALUE aws cdk stack props tags VALID STACK NAME REGEX test this stackName throw new Error `Stack name must match the regular expression $ VALID STACK NAME REGEX toString got $ this stackName ` const featureFlags=feature flags 1 FeatureFlags of this stackNameDupeContext=featureFlags isEnabled cxapi ENABLE STACK NAME DUPLICATES CONTEXT newStyleSynthesisContext=featureFlags isEnabled cxapi NEW STYLE STACK SYNTHESIS CONTEXT this artifactId=stackNameDupeContext||newStyleSynthesisContext this generateStackArtifactId this stackName this templateFile=`$ this artifactId template json` this versionReportingEnabled= c=props analyticsReporting ==null amp amp c ==void 0 c this node tryGetContext cxapi ANALYTICS REPORTING ENABLED CONTEXT amp amp this nestedStackParent this synthesizer= d=props synthesizer ==null amp amp d ==void 0 d newStyleSynthesisContext new stack synthesizers 1 DefaultStackSynthesizer new stack synthesizers 1 LegacyStackSynthesizer this synthesizer bind this static isStack x return x ==null amp amp typeof x== object amp amp STACK SYMBOL in x static of construct const cache=construct MY STACK CACHE if cache return cache const value= lookup construct return Object defineProperty construct MY STACK CACHE enumerable 1 writable 1 configurable 1 value value function lookup c var b c if Stack isStack c return c const scope=constructs 1 Node of c scope if stage 1 Stage isStage c || scope throw new Error `$ c= b=construct constructor ===null|| b===void 0 void 0 b name ==null amp amp c ==void 0 c Construct at $ constructs 1 Node of construct path should be created in the scope of a Stack but no Stack found` return lookup scope resolve obj return resolve 1 resolve obj scope this prefix resolver cloudformation lang 1 CLOUDFORMATION TOKEN RESOLVER preparing 1 toJsonString obj space return cloudformation lang 1 CloudFormationLang toJSON obj space toString reportMissingContext report if Object values cxschema ContextProvider includes report provider throw new Error `Unknown context provider requested in $ JSON stringify report ` this reportMissingContextKey report reportMissingContextKey report jsiiDeprecationWarnings aws cdk lib cloud assembly schema MissingContext report this missingContext push report renameLogicalId oldId newId this logicalIds addRename oldId newId getLogicalId element jsiiDeprecationWarnings aws cdk lib CfnElement element const logicalId=this allocateLogicalId element return this logicalIds applyRename logicalId addDependency target reason jsiiDeprecationWarnings aws cdk lib Stack target deps 1 addDependency this target reason get dependencies return Object values this stackDependencies map x= gt x stack get stackName return this stackName get partition return cfn pseudo 1 Aws PARTITION get urlSuffix return cfn pseudo 1 Aws URL SUFFIX get stackId return new cfn pseudo 1 ScopedAws this stackId get notificationArns return new cfn pseudo 1 ScopedAws this notificationArns get nested return this nestedStackResource ==void 0 formatArn components return jsiiDeprecationWarnings aws cdk lib ArnComponents components arn 1 Arn format components this parseArn arn sepIfToken= hasName= 0 return arn 1 Arn parse arn sepIfToken hasName splitArn arn arnFormat return jsiiDeprecationWarnings aws cdk lib ArnFormat arnFormat arn 1 Arn split arn arnFormat get availabilityZones if token 1 Token isUnresolved this account ||token 1 Token isUnresolved this region return this node tryGetContext cxapi AVAILABILITY ZONE FALLBACK CONTEXT KEY || cfn fn 1 Fn select 0 cfn fn 1 Fn getAzs cfn fn 1 Fn select 1 cfn fn 1 Fn getAzs const value=context provider 1 ContextProvider getValue this provider cxschema ContextProvider AVAILABILITY ZONE PROVIDER dummyValue dummy1a dummy1b dummy1c value if Array isArray value throw new Error `Provider $ cxschema ContextProvider AVAILABILITY ZONE PROVIDER expects a list` return value addFileAsset asset return this synthesizer addFileAsset asset addDockerImageAsset asset return this synthesizer addDockerImageAsset asset get nestedStackParent return this nestedStackResource amp amp Stack of this nestedStackResource get parentStack return this nestedStackParent addTransform transform this templateOptions transforms|| this templateOptions transforms= this templateOptions transforms push transform addAssemblyDependency target reason if this nested||target nested throw new Error Cannot add assembly level dependencies for nested stacks reason=reason|| dependency added using stack addDependency const cycle=target stackDependencyReasons this if cycle ==void 0 throw new Error ` $ target node path depends on $ this node path $ cycle join Adding this dependency $ reason would create a cyclic reference ` let dep=this stackDependencies names 1 Names uniqueId target dep|| dep=this stackDependencies names 1 Names uniqueId target = stack target reasons dep reasons push reason process env CDK DEBUG DEPS amp amp console error ` CDK DEBUG DEPS stack $ this node path depends on $ target node path because $ reason ` synthesizeTemplate session lookupRoleArn const builder=session assembly template=this toCloudFormation outPath=path join builder outdir this templateFile if this maxResources gt 0 const resources=template Resources|| numberOfResources=Object keys resources length if numberOfResources gt this maxResources throw new Error `Number of resources in stack $ this node path $ numberOfResources is greater than allowed maximum of $ this maxResources ` numberOfResources gt =this maxResources 8 amp amp annotations 1 Annotations of this addInfo `Number of resources $ numberOfResources is approaching allowed maximum of $ this maxResources ` fs writeFileSync outPath JSON stringify template void 0 2 for const ctx of this missingContThere was an error synthesizing your app error Command failed with exit code 1 info Visit for documentation about this command ```

Seth Geoghegan · Answer

I ve tried removing `node modules` and `yarn lock` reinstall packages via `yarn` and executed `yarn run start` This gives me the same result as above

Seth Geoghegan · Answer

I m on the latest version of sst ``` dependencies serverless stack cli 0 60 4 serverless stack resources 0 60 4 aws cdk lib 2 7 0 ```

Seth Geoghegan · Answer

OK I removed `cdk context json` file and tried `yarn run start` This seems to have done the trick I guess that file ended up in a weird state

Frank · Answer

oh wow that s a really cryptic error

Frank · Answer

Glad u figured it out

Frank · Answer

If it happens again can you DM me ur `cdk context json` and I will try to reproduce this on my end

Seth Geoghegan · Answer

Hi Frank sure thing I ve been iterating on my stacks quite a bit while also including an upgrade to CDKv2 I didn t dig into the `cdk context json` before deleting and re building but it was my last guess Smooth sailing since but I ll make sure to DM the file if I get into this state again

Seth Geoghegan · Answer

It happened again DM ing now

Frank · Answer

Just reporting back seems to be typo in `package json` grin

Seth Geoghegan · Answer

Yes This was not an SST issue I had updated my package json to this ``` scripts start sst start stage $ whoami ``` `$ whoami ` is not correct but `$ whoami ` is