typescript-catch-helper.ts

catch-helper.ts

type ItemResponse = {
  items: number[];
  error?: Error;
};

function getItems(shouldReject: boolean): Promise<ItemResponse> {
  return new Promise((resolve, reject) => {
    if (!shouldReject) return resolve({ items: [1, 2, 3, 4, 5] });
    reject(new Error("Something wrong happened."));
  });
}

async function doSomething() {
  const result = (await getItems(true).catch((error) => {
    return error;
  })) as ItemResponse;

  if (result.error) {
    console.error(result.error.message);
    return;
  }

  result.items?.forEach((item) => {
    console.log(item);
  });
}