compose is a higher order function. In the first step it accepts a function that converts 3 values (V1 to V3) into a single values (T1) and a series of conversion functions that converts this single value into another value (T1 into T2, T2 into T3 and so on until T6). Using these functions it produces a new function that converts the combination of V1, V2 and V3 into a T6.
I don't know ramda, but I assume this is only part of the type definition of compose and this is just the longest part of it. I think compose is written in such a way that it can accept a many conversion functions as you want and this is just the longest variant that is encoded in the types.
I don't know ramda, but I assume this is only part of the type definition of compose and this is just the longest part of it. I think compose is written in such a way that it can accept a many conversion functions as you want and this is just the longest variant that is encoded in the types.