Office Script to Check if Table Header Exists

I'm working on a macro in OfficeScript.
Among other things I need it to check if a column header exists in the given table and add a column if it doesn't exist. This part doesn't seem to work.

Here is the relevant snippet

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The office script documentation says that if getColumn should return 'undefined' if a column is not found, so I also tried number of tests for an undefined variable, but all return false.

https://learn.microsoft.com/en-us/ja...lumn-member(1)

So at this point I am thinking I may need to add a function to loop through all the headers, but that feels like overkill.
Any suggestions?

Here is my full code. I attached a sample workbook with appropriately named worksheet and table.

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Cross-posted here now: https://stackoverflow.com/questions/...missing-header

Your function code works for me if the table doesn't have that column. (It doesn't work with your sample file and the full code you posted because a previous missing column causes the code to abort before that)