tryAsync - API reference

API reference › @evolu/common › Result › tryAsync

function tryAsync<T, E>(
  lazyPromise: Lazy<Promise<T>>,
  mapError: (error: unknown) => E,
): Promise<Result<T, E>>;

Defined in: packages/common/src/Result.ts:440

Wraps an async function that may throw, returning a Result.

Use this when the rejection should become a typed, recoverable error for the caller. Do not use it for failures that should terminate the current flow and propagate to a global handler.

Example

const fetchJson = (url: string): Promise<Result<unknown, FetchError>> =>
  tryAsync(
    async () => {
      const response = await fetch(url);
      if (!response.ok) throw new Error(`Status ${response.status}`);
      return response.json();
    },
    (error) => ({ type: "FetchError", message: String(error) }),
  );