Can not use code example as is

[Luxcium]

I tried to copy-paste the code example and it is not working (I updated the const keyword for let) but I still have an error message: Expected 1 arguments, but got 0.ts(2554) index.d.ts(201, 17): An argument for '$type' was not provided.

// transpile to Less
 result = ColorMath.evaluate('rgb 165 42 42 >> .2', {
  evaluator: new ColorMath.Evaluators.LessEvaluator(),
});
console.log(result.result); // prints "saturate(rgb(165, 42, 42), 20%, relative)"