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When Anders Hejlsberg did a lot of those talks to sell TypeScript, he described a lot of JavaScript as "stringly typed", which is very obvious with all the addEventListener("click", ...) and so on depending on certain strings. The term itself is not compliment, if you describe someone else's API as such, it's not well taken.

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JS is also "stringly typed" in a sense that you can access object's properties by just string names, foo.bar and foo["bar"] is the same thing.

It lead to a really nice Typescript feature, where you can declare something like type FooProp = "bar" | "baz", and the typechecker is smart enough to only allow these literal strings where you use values of FooProp type (e.g. when accessing properties by name, like above). This collapsed the whole crowd of strings, enums, and symbolic constants to just strings, without any loss of type safety, which I find a cognitive win.

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