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Does pulumi come with something like this out of the box? I can make it just don't want to if its not needed:

<https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/bicep-functions-string#uniquestring>

I really also want to specify the desired output length, but would be nice to know if there is anything similar already.

> uniqueString
> `uniqueString(baseString, ...)`
> Creates a deterministic hash string based on the values provided as parameters.
> Namespace: <https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/bicep-functions#namespaces-for-functions|sys>.

Have you checked out <https://www.pulumi.com/registry/packages/random/api-docs/randomstring/>?

I saw that, but I want it deterministic based on input. Though maybe it provides such functionality, I will double check

Ah, ok. Yeah, I don't believe it accepts input in that sense

What's the usecase for?
You could just use sha256 (or whatever hash) and chomp the length