Typescript with --strictNullCheck - check not null in separate method

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I am having fun with the compiler --strictNullCheck option

I have this method:

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I need to check if the headers are not null before i can use them. That's great

Now I would like to move the checking operation to the separate method like this:

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But not I'm getting this error:

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So there is no way to check if some object or the some of its property is not null in the separate method?

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