I've been experimenting with using the bind method alongside curry, but I keep running into a type error.
const curried = curry(this.method.bind(this));
const getSomething = curried(a, b);
An error message is being thrown by TypeScript for getSomething:
expected 0-1 arguments but got 2.
Interestingly, when I remove the bind method, everything works fine without any complaints.
const curried = curry(this.method);
const getSomething = curried(a, b);
An issue arises with the bind signature:
bind(this: Function, thisArg: any, ...argArray: any[]): any;
The return type of bind for a function is any. However, curry still functions properly because any can be converted to any other type. Therefore, the first overload declaration of curry is utilized:
curry<T1, R>(func: (t1: T1) => R, arity?: number): CurriedFunction1<T1, R>;
In this case, T1 and R are inferred as {}.
This discrepancy highlights the need to avoid using bind as it leads to loss of type information. Crafting a universally type-safe version of bind proves challenging due to its ability to bind both this and function arguments. However, a simple version that solely binds this while preserving type info is feasible:
function typedThisBind<T1, T2, T3, T4, R>(fn: (t: T1, t2: T2, t3: T3, t4 : T4) => R, thisArg: any) : typeof fn
function typedThisBind<T1, T2, T3, R>(fn: (t: T1, t2: T2, t3: T3) => R, thisArg: any) : typeof fn
function typedThisBind<T1, T2, R>(fn: (t: T1, t2: T2) => R, thisArg: any) : typeof fn
function typedThisBind<T1, R>(fn: (t: T1) => R, thisArg: any) : typeof fn
function typedThisBind<R>(fn: () => R, thisArg: any) : () => R
function typedThisBind(fn: Function, thisArg: any) : any {
return fn.bind(thisArg);
}
By employing this modified version of bind, all functionalities should operate as anticipated (for functions with up to 5 arguments, additional parameters can be easily included):
class Foo {
method(a: number, b: number) {}
m(){
const curried = curry(typedThisBind(this.method, this));
const getSomething = curried(0, 0); // Functions as expected.
}
}
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