How does

aws.Provider

have a

region

output, but TS throws:

2339: Property 'region' does not exist on type 'Provider'.

Looking at

@pulumi/aws/provider.d.ts

, the aws.Provider class doesn't expose any of its values as properties. It does register its inputs/outputs in the checkpoint file, which is why region appears there (region is defined in the ProviderArgs interface for input). Unfortunately, in order to actually access these values from external TS code, they would need to be declared in the class. Depending on what you are trying to do, I believe

aws.config.region

can give you the region that is being used.