Serverless Stack

Is there a way to deploy multiple stacks in parallel, in seed.run. For example, we have

```new StackA();
new StackB();
new StackC();
new StackD();```
Scenario 1: Deploy all the stacks in parallel.

Scenario 2: Deploy `StackA` and `StackB` in parallel and `StackC` and `StackD` depends on `StackA` and `StackB` hence deploy `StackC and StackD` in parallel, but in second stage?

Hey <@U02BACTBVJQ>, SST will try to deploy the stacks in parallel if there are not interdependent.

If A, B, C, D are not dependent on each other, SST will deploy all 4 stacks concurrently.

```this.stack1.addDependency(this.stack2);```

What happens in the following case?

```const stackA = new StackA(scope, "StackA");

// 
new StackB(scope, "StackB", { url: stackA.url });```
Does both `stackA` and `stackB` deployed parallelly? Or `StackB` waits till `StackA` gets deployed so that it can get the `url`?

Depends on if StackB uses the StackA’s url. If it is being used, then yes, StackA deploys, and then StackB deploys.

Behind the scene, SST creates an CFN export in StackA, and StackB imports it.