How do you depensOn a resource that is in the array? such as:

{
      dependsOn: [
        restApiPolicys[region]
      ],
      provider: config.providers[configEnvironment] as aws.Provider,
    },

So long it's a resource, it will work. Assuming that

restApiPolicys

is a variable (and not a property of the resource).

RestapiPolicy is a Record<string, aws..policy>[]

So is restApiPolicys[region] an instance of

aws.iam.Policy

? That will work. I've never see a need to depend on a Policy though. The only reason to need a Policy would be for its ARN, and that is (afaik) only ever used directly. Is it used directly in this object? We can't see the resource inputs.

It is a list of records, which contains policy obj.

So long as the resource object is what's in the dependOn array, it'll work. Is it not working?

This is how the var is defined:

restApiPolicys: Record<string, aws.apigateway.RestApiPolicy> = {};

Is it working?

no, I can't depends it.

Need more information. Error message? Unexpected behaviour? Also, a snippet of code would be good.