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[Terraform's `try` function](https://developer.hashicorp.com/terraform/language/functions/try) accepts a variable number of arguments (of variable types) and returns the first that does not throw an error when evaluated. This change takes a first pass at adding `try` to PCL, in an effort to support better conversion from Terraform to Pulumi programs. It makes the following contributions: * PCL gets a new `try` function, which takes a single argument which is a list/tuple of expressions to be tried. * Code generation for NodeJS and Python has been extended to support a naive first implementation of `try`. Both implementations rely on these languages being dynamic under the hood. A Go implementation is not currently provided and its omission is tracked by #18506. * A conformance test, `l1-builtin-try`, has been added to exercise the NodeJS and Python implementations. It is skipped in Go with a reference to the aforementioned tracking issue. When this has merged, we can look at extending `pulumi-converter-terraform` to generate applications of `try`, which should enable us to make progress converting a number of popular Terraform modules and programs. Part of #18350 Co-authored-by: Will Jones <will@sacharissa.co.uk> |
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