How to assert a type of an HTMLElement in TypeScript?

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I’m trying to do this:

var script:HTMLScriptElement = document.getElementsByName("script")[0];
alert(script.type);

but it’s giving me an error:

Cannot convert 'Node' to 'HTMLScriptElement': Type 'Node' is missing property 'defer' from type 'HTMLScriptElement'
(elementName: string) => NodeList

I can’t access the ‘type’ member of the script element unless I cast it to the correct type, but I don’t know how to do this. I searched the docs & samples, but I couldn’t find anything.

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