fromPromise()

const fromPromise: <T, E>(promise, errorFn) => ResultAsync<T, E> = ResultAsync.fromPromise

Convenience export for ResultAsync.fromPromise.

Creates a ResultAsync from a Promise that may reject. The errorFn parameter is used to transform any rejection into an error value.

---

Type Parameters

T: T

The type of the value in the Promise

E: E

The type of the error

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Parameters

promise: Promise<T>

Promise that may resolve or reject

errorFn: (e) => E

Function to transform rejections into error values

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Returns: ResultAsync<T, E>

A new ResultAsync that will resolve to Ok(value) or Err(error)

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Example

const fetchUser = (id: string) =>
  fetch(`/api/users/${id}`).then(r => r.json());

const result = ResultAsync.fromPromise(
  fetchUser("123"),
  (error) => `Failed to fetch user: ${error}`
);

const resolved = await result;
if (resolved.isOk()) {
  console.log(resolved.value); // User data
} else {
  console.log(resolved.error); // Error message
}

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Since

2.0.0

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Example

import { fromPromise } from './result-async';

const result = fromPromise(
  fetch('/api/data'),
  error => `Fetch failed: ${error}`
);