Linus Groh 85f0fc2b83 LibJS: Return Optional<T> from Completion::{value,target}(), not T ...

In the end this is a nicer API than having separate has_{value,target}()
and having to check those first, and then making another Optional from
the unwrapped value:

    completion.has_value() ? completion.value() : Optional<Value> {}
    //                       ^^^^^^^^^^^^^^^^^^
    //         Implicit creation of non-empty Optional<Value>

This way we need to unwrap the optional ourselves, but can easily pass
it to something else as well.

This is in anticipation of the AST using completions :^)

2022-01-03 21:50:50 +01:00

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