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wip: support overloads in call #328

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wip: support overloads in call #328

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68 changes: 65 additions & 3 deletions types/index.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -184,10 +184,16 @@ export function putResolve<A extends Action>(
action: A,
): SagaGenerator<A, PutEffect<A>>;

export function call<Fn extends (...args: any[]) => any>(
export function call<
Fn extends (...args: any[]) => any,
Args extends OverloadParameters<Fn>
>(
fn: Fn,
...args: Parameters<Fn>
): SagaGenerator<SagaReturnType<Fn>, CallEffect<SagaReturnType<Fn>>>;
...args: Args
): SagaGenerator<
SagaReturnType<ExtractOverload<Fn, Args>>,
CallEffect<SagaReturnType<ExtractOverload<Fn, Args>>>
>;
export function call<
Ctx extends {
[P in Name]: (this: Ctx, ...args: any[]) => any;
Expand Down Expand Up @@ -525,3 +531,59 @@ export function race<T extends { [key: string]: any }>(
{ [K in keyof T]: EffectReturnType<T[K]> | undefined },
RaceEffect<T[keyof T]>
>;

// helpers

type Overloads<Fn extends (...args: any) => any> = Fn extends {
(...args: infer P1): infer R1;
(...args: infer P2): infer R2;
(...args: infer P3): infer R3;
(...args: infer P4): infer R4;
(...args: infer P5): infer R5;
}
? [
(...args: P1) => R1,
(...args: P2) => R2,
(...args: P3) => R3,
(...args: P4) => R4,
(...args: P5) => R5,
]
: Fn extends {
(...args: infer P1): infer R1;
(...args: infer P2): infer R2;
(...args: infer P3): infer R3;
(...args: infer P4): infer R4;
}
? [
(...args: P1) => R1,
(...args: P2) => R2,
(...args: P3) => R3,
(...args: P4) => R4,
]
: Fn extends {
(...args: infer P1): infer R1;
(...args: infer P2): infer R2;
(...args: infer P3): infer R3;
}
? [(...args: P1) => R1, (...args: P2) => R2, (...args: P3) => R3]
: Fn extends {
(...args: infer P1): infer R1;
(...args: infer P2): infer R2;
}
? [(...args: P1) => R1, (...args: P2) => R2]
: [Fn];

type OverloadParameters<Fn extends (...args: any) => any> = Parameters<
Overloads<Fn>[number]
>;

type ExtractOverload<
Fn extends (...args: any) => any,
Args extends any[]
// eslint-disable-next-line @typescript-eslint/ban-types
> = Extract<Overloads<Fn>[number], (...args: Args) => any>;

type OverloadReturnType<
Fn extends (...args: any) => any,
Args extends any[]
> = ReturnType<ExtractOverload<Fn, Args>>;