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Hi JohnB,
  I tested this locally and verified that the stack component transformation works. Here is my code:
<https://gist.github.com/tusharshahrs/1072f4cc5b5db33a47587edfa0203d98>

Here is where the tags are set: <https://gist.github.com/tusharshahrs/1072f4cc5b5db33a47587edfa0203d98#file-index-ts-L6-L11>

The `pulumi preview —diff` will show that the correct tags are applied automatically.  If you want to share your code we can take a look at it.

Thanks <@U019AM8NP1A>, I can't see where you're creating a custom component though?

I'll get a complete repro up shortly, thanks :slightly_smiling_face:

Doing a minimal repro works fine, not sure why PEBKAC somewhere :face_with_rolling_eyes:
/close :slightly_smiling_face:

The `awsx.ec2.Vpc` resource is a custom component in Tushar's example, FWIW.

If you do find a scenario where it doesn't work, please open an issue at <http://github.com/pulumi/pulumi|github.com/pulumi/pulumi>.

One nuance to stack transformations is the call to `pulumi.runtime.registerStackTransformation()` _*must*_ occur before any resources get defined, otherwise they will be "missed" by the transformation.