Unicode MessageFormat for JavaScript
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    Type Alias Expression<A>

    Expression: { attributes?: Attributes; type: "expression" } & (
        A extends Model.Literal
        | Model.VariableRef
            ? { arg: A; functionRef?: Model.FunctionRef }
            : { arg?: never; functionRef: Model.FunctionRef }
    )

    Expressions are used in declarations and as placeholders. Each must include at least an arg or a functionRef, or both.

    Type Parameters