Conditional use of VSCode plot pane in `Base.show`?

Tooling VS Code
2

Yes, via showable:

struct Foo 
    html::Bool
end

Base.showable(::MIME"juliavscode/html", f::Foo) = f.html
Base.show(io::IO, ::MIME"juliavscode/html", f::Foo) = print(io, "<h1>pretty!</h1>")
Base.show(io::IO, ::MIME"text/plain", f::Foo) = print(io, "a bit plain, don't you think?")

Foo(false)
Foo(true)

or by throwing a MethodError to make the display system think your show method doesn’t exist:

struct Bar 
    html::Bool
end

function Base.show(io::IO, m::MIME"juliavscode/html", f::Bar)
    if f.html
        print(io, "<h1>pretty!</h1>")
    else
        throw(MethodError(show, (io, m, f)))
    end
end

Bar(false)
Bar(true)
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