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In Terraform there is a `data` type that I can use to refer to and verify external ( unmanaged ) resources

Is there an equivalent in Pulumi?

There is. Generally, this would be accomplished with a SDK such as the AWS SDK for node/go/python/csharp. You'd import that SDK into your Pulumi project and are free to use the full scope.

All the resources have a `get` function that creates a read-only, unmanaged version of the resource.

And there are SDK wrappers in most modules.

For example, the AWS EC2 module has GetAmi, GetNetworkInterfaces, GetRoute, etc. <https://www.pulumi.com/registry/packages/aws/api-docs/ec2/> (scroll half-way down the page).

Yep, that's also a great solution. Generally, the more complex the lookup, the more likely you'll need to use an external SDK. Eg- if you have the AWS ARN/ID of the resource use the `get` functions.