where typing about npm-ramda

[jon49]

That seems to work, good idea. It would give the user a pointer in the right direction. Although, from playing around with it it doesn't offer the type safety.

interface Pred2<T> {
    (x: any, y: T): boolean
}
interface ObjPred2<T> {
    [index: string]: Pred2<T>;
}
where<T>(spec: ObjPred2<T>, testObj: T): boolean;

// Tests

var spec2: R.ObjPred2<{x: number; y: number}> =  {x: function(val, obj) { return  val + obj.y > 10; }};
R.where(spec2, {x: 2, y: 7}); //=> false
R.where(spec2, {x: 3, y: 8}); //=> true
R.where({x: (val, obj) => val + obj.y > 10}, {x: 3, y: 8})

The above seems to make it more type safe and to fail when obj doesn't use correct properties. Still not working for making x into other property names though. But it is much better than before!