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For Pulumi.yaml it should be
```name: my-site
runtime: nodejs
main: ./index.ts
config:
    aws:region: us-east-1
    domain: <http://robcarr.net|robcarr.net>
    tags:
      - production
      - staging```


assuming you want to set those defaults for all stacks. i'm not 100% sure exactly what you are trying to accomplish based on the code you posted

I have a bunch of micro stacks, I wanted to add a stack tag to each one which had the environment it was used in, shared resources would get both tags

Things aren't going particularly well atm though, I can't even get pulumi up to work at the minute, it keeps saying unknown file extension .ts on index.ts yet the docs say it's got built in typescript support

oh i see. why don't you use the Pulumi CLI to set a tag in order to find out what the format is in the config file?
```pulumi stack tag set &lt;name&gt; &lt;value&gt;```
<https://www.pulumi.com/docs/reference/cli/pulumi_stack_tag_set/>

and i think your other issue about the `.ts` extension may have to do with the presence of `"type": "module"` in your package.json? I think i ran into that in the past and never got it to work

I've found a way round both issues by using InlinePrograms from the pulumi automation package, means I get to keep everything using modules, still get to keep my tsconfig path aliases and I can actually get rid of the yaml files, package.json etc and just define everything in pure typescript, way better!