Consider the code snippet below:
function* gen() {
let v = yield Promise.resolve(0);
return v;
}
The variable v is automatically assigned the type any. Is there a method to indicate a specific type (such as number) based on the context of the code?
Although using async/await would solve this issue in this particular case, I am interested in a more general solution that doesn't involve promises.
Regrettably, at the present moment Typescript does not offer support for this particular scenario. Finding a suitable workaround seems challenging, with the only known option being to manually annotate each yield statement:
function* gen() {
let v: number = yield Promise.resolve(0);
return v;
}
Solving this issue is complex, as the value yielded by yield statements relies entirely on the consuming generator's semantics. While I can predict that yield Promise.resolve(0) will eventually return a number due to my understanding of coroutine, the actual value of v remains uncertain.
Looking ahead, it is hoped that Typescript will introduce mechanisms to declare these relationships within the generator's type itself. Refer to this relevant github issue for more information.
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