@metreeca/core - v0.9.22
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    Type Alias Resolver

    Resolver:
        | { readonly [key: string]: string }
        | ((key: string) => undefined | string)

    Value lookup by key.

    Supplies the value a key stands for, either as a record listing the values or as a function computing them on demand. A record leaving a key out and a function returning undefined for it alike leave the key unresolved, and what that means is left to the operation taking the lookup.