I have question specific to sst stack w.r.t typescript (first time coding in typescript so yea) I am trying to create helper methods which can create api-stacks for me. The idea is that i will pass in

<http://sst.App|sst.App>, name, props

and rest would be generic. I am planning to use

props

to pass in which methods to create (

get

,

post

etc) since the name would be same and then use

props.tables

to attach permissions to specific tables (dynamodb). Right now my props interface looksl ike this

interface MyApiProps extends sst.StackProps {
  readonly authorizer: apigAuthorizers.HttpUserPoolAuthorizer;
  readonly table?: sst.Table;
  readonly get: boolean;
}

The problem i am having is on

table?

property. given that its "optional" it can exist or not. Now when i try to make a custom prop by this code

new MyApiStack(app, "heartbeat", {authType: sst.ApiAuthorizationType.NONE, get: true});

I get an error on

_this_.api.attachPermissions([props?.table as sst.Table]);

in my

MyApiStack

class which is generalizing all this. The error that i get is "The specified permissions are not supported". This error is easily fixed if i pass a table object in

MyApiStack(app, "myapi", {authType: sst.ApiAuthorizationType.NONE, get: true, table: myTable});

But I want to find a way where i could skip passing a table object and based on object type (null etc) i avoid attaching permissions. I have already tried this code but it didn;t work

if (props?.table !== null) {
      this.api.attachPermissions([props?.table as sst.Table]);
    }

Your last snippet should work without the

as

the if condition you mentioned worked. could you elaborate a bit more on

Also in this scenario you might want to be making a generic cdk.Construct instead of a stack.  You're kind of making your own 

sst.Api

 basically

Right now my ApiStack has following signature

export default class APIStack extends sst.Stack {

  constructor(scope: <http://sst.App|sst.App>, name: string, props?: MyCustomProps) {
    super(scope, id, props)
    // setup api
    // add permissions
    // add outputs
  }
}