Serverless Stack

^ seems to be working now. blew up node_modules.

Yeah, reading deeper in the error it was mismatched types (same type reference :man-shrugging: ). I deleted the entire node modules dir and did a reinstall. It seems like a version mismatch, but the versions were the same…

I do not have the exact error anymore but it was close to this:
<https://github.com/aws/aws-cdk/issues/8211>

Do you remember if the error comes from the CDK code or SST code?

Sorry I’m not being much help at this point… So the message saying it expected IUserPool instead of UserPool was from sst. But I THINK that was a bit misleading because the incompatible parameter types from cdk.

Got it. My hunch is that you have the `aws-cognito` dependency in your package.json, and you are using it to import the userpool. And `sst.AppSyncApi` also has a `aws-cognito` module in its package.json. And depending on how npm installs them, there could be 2 different instances of `aws-cognito` in your node_modules.

And doing a fresh install usually solves that.

BTW is there a good way to see what version sst expects?

In this case, they are probably of the same version. Your node_modules probably looked like:
```node_modules/
  @aws-cdk/
    aws-cognito v1.94.1
  @serverless-stack
    @aws-cdk/
      aws-cognito v1.94.1```

If the user pool is created using 1 `aws-cognito` import, and then the other `aws-cognito` try to check its type, it results in an type error

But yeah to answer your question, SST will print out a warning if there is a version mismatch with the version that is mismatched.

This type of issues will be resolved in CDK v2. SST will be able to include `aws-cdk` as a peerDependency. So there should never be multiple instances of the same CDK classes in your node_modules.

sweet, cdk is moving monolith structure (like sst)