Yielded value from 'call' have type 'unknown'

[ekabolotina]

Hi everyone! I have just bumped into the situation:

import { call } from "typed-redux-saga";

type Product = {
    id: number;
    name: string;
}

type ProductExtended = Product & {
    weight: number;
}

export function normalizeProduct<T extends Partial<Product>>(product: T): T {
    const { name = '' } = product;

    return {
        ...product,
        name: name.trim(),
    };
}

function* saga(productExtended: ProductExtended) {
    const productExtendedNormalized = yield* call(normalizeProduct, productExtended);
    // productExtendedNormalized is now of type 'unknown', but expected type is 'ProductExtended'
}

[nam-hle]

Maybe the issue is from SagaReturnType. Rewrite it as below could fix:

export type SagaReturnType<
  S extends (...args: any[]) => any,
  T = ReturnType<S>,
> = T extends SagaIterator<infer RT>
  ? RT
  : T extends Promise<infer RT>
  ? RT
  : T extends infer RT
  ? RT
  : never;