My first introduction to TypeScript was trying to use it to solve Advent of Code.
I wrote some code that iterated over lines in a file or something and passed them to a function that took an argument with a numeric type.
I thought this would be a great test to show the benefits of TypeScript over plain JavaScript: either it would fail to compile, or the strings would become numbers.
What actually happened was it compiled perfectly fine, but the "numeric" input to my function contained a string!
I found that to be a gross violation of trust and have never recovered from it.
I wrote some code that iterated over lines in a file or something and passed them to a function that took an argument with a numeric type.
I thought this would be a great test to show the benefits of TypeScript over plain JavaScript: either it would fail to compile, or the strings would become numbers.
What actually happened was it compiled perfectly fine, but the "numeric" input to my function contained a string!
I found that to be a gross violation of trust and have never recovered from it.
EDIT: See https://news.ycombinator.com/item?id=46021640 for examples.