Advent of Code 2019 - Typescript

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> "The same procedure as last year, Miss Sophie?"
> "The same procedure as every year, James!"

This year I will try to solve the challenges with typescript. Originally I wanted to use Befunge, but the problems don't really work that well in Befunge.
Especially big input files are annoying to realize without I/O functions...

This is my first real encounter with typescript (or javascript that's more than small scripts) so the resulting code should be ... suboptimal.
But I hope I will improve :D

The compiled javascript code can be viewed here:

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made with vanilla PHP and MySQL, no frameworks, no bootstrap, no unnecessary* javascript