curry2.js

function curry2(func) {
    return function (...args) {
        if (args.length < 2) {
            return func.bind(this, ...args);
        }
        return func.apply(this, args);
    };    
}

assuming that func has exactly two parameters (= 3 type variables, incl. the result)

@rauschma That would make it much easier with the current implementation of Typescript:

function curry2<TF, TS, R>(func: (first: TF, second: TS) => R ): (first: TF, second: TS) => R {
    return function (first: TF, second: TS): R {
        return func.call(this, first, second);
    }
}

Example