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I can’t answer the detailed “how”, but it is shorthand for handling resource outputs which need to be resolved before use. See https://www.pulumi.com/docs/intro/concepts/inputs-outputs/ The specific doc page for interpolate: https://www.pulumi.com/docs/intro/concepts/inputs-outputs/#outputs-and-strings

Yes. That’s where I came across this functionality.

If you're asking about the js syntax, it's called a tagged template literal string

Tagged template literals call a function (the tag function) with an array of any text segments from the literal followed by arguments with the values of any substitutions, which is useful for DSLs

Thanks. That’s what I am looking for.