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kotlinlang

Hello everyone!
I'm not sure if it's a multiplatform question exactly, but I'm trying to add some *js* mappings for my web target and the script in question happens to add certain fields to the `window` object. However, so far I was not able to find a proper way of implementing the mapping
Let's say the script provides `window.foo` which is a `string` value
When I tried to add a mapping I did something like this `external val Window.foo: String`, however apparently I cannot make an extension property external and the solution offered by my IDE (`asDynamic`) also fails miserably. What is the right way of tackling it?