Yes, implicit currying where supplying the final arg actually calls the underlying function is one kind of partial function application. Ramda is one thing I use.

I also use an in-house library to explicitly apply arguments to return a a new function, which allows you to produce 0 arity or variadic functions.

I’m glad somebody has a work around for using Ramda in TS, but it looks every bit as “fun” as generics in Java, which I think have wasted more of my time than they have ever saved.