Tips for waiting for all promises within an object to resolve and returning the results as a partial record

Question

Tips for waiting for all promises within an object to resolve and returning the results as a partial record

As I was in the midst of posing this question, a solution suddenly dawned on me. I decided to quickly share it here in case someone else may find it useful.

I encountered an object p that is of type

Partial<Record<Index,Promise<Value>>>

. This allows me to reference the entries using a fixed set of keys. However, since the keys are dynamically generated and I need to repeat this process for multiple objects, manually typing out all the types is not feasible. My goal is to await the promise in order to transform my return type into

Promise<Partial<Record<Index,Value>>>

.

typescript typescript-typings

Answer 1

Answer №1

Here is my proposed solution:

function awaitEntries<T>(p: T) {
  let x: Partial<Record<keyof T, Awaited<T[keyof T]>>> = {};
  Object.entries(p).forEach(([key, p]) =>
    Promise.resolve(p).then((v) => {
      x[key as keyof T] = v;
    })
  );
  return x;
}

Answer 2

Here is my proposed solution:

function awaitEntries<T>(p: T) {
  let x: Partial<Record<keyof T, Awaited<T[keyof T]>>> = {};
  Object.entries(p).forEach(([key, p]) =>
    Promise.resolve(p).then((v) => {
      x[key as keyof T] = v;
    })
  );
  return x;
}

Tips for waiting for all promises within an object to resolve and returning the results as a partial record

Answer №1

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