[fixermark]

Typescript is definitely an improvement over type-free JS, but it's still wedded to the JS type system so unfortunately, it will still let you shoot yourself in the foot in ways you might not anticipate if you have experience with other languages with a stronger type system.

For example, If you have a string-typed foo and a number-typed bar, "foo + bar" is still a valid statement in TS because they have to maintain backwards-compatibility with JS's unfortunate language design choices.