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Not currently, we'll probably extend config to support them at some point: <https://github.com/pulumi/pulumi/issues/11547>

In my case, I would like to define `aws:defaultTags` as the value of my CI branch. I do this with Terraform

Also, is it possible to define the configuration in typescript instead of yaml?

For the aws provider yes, use an explicit provider: <https://www.pulumi.com/docs/intro/concepts/resources/providers/#explicit-provider-configuration>

If I use an explicit provider, I will have to provide it every time I create a resource?

yes. to make it less error prone you can <https://www.pulumi.com/docs/intro/concepts/resources/providers/#disabling-default-providers|disable the default provider for aws>

But you can keep the secrets in a separate file so that you can add it to .gitignore, right?