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There is also <https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/pulumi/dynamic/#ResourceProvider>  (didn't use myself)

If you go with gRPC route and your provider is in Go, then implement this interface <https://github.com/pulumi/pulumi/blob/master/sdk/proto/go/provider.pb.go#L1398-L1429>

otherwise implement generic gRPC: <https://github.com/pulumi/pulumi/blob/67ec74bdc5222e06c9803714d3debf1261021341/sdk/proto/provider.proto>

Yes, but how do I link them afterwards to be able to use them from python, go, javascript?