throw-not

Utilites to help writing code using the pattern of returning errors instead of throwing them.

Part of the throw-not family of packages:

• throw-not
• that-error

Install

npm install throw-not
pnpm install throw-not
yarn install throw-not

Example

import { Result, isError } from 'throw-not';

function somethingThatCouldThrow(): Result<string> {
  if (...) {
    return new Error('something went wrong');
  }
  return 'something';
}

function something(): string {
  const result = somethingThatCouldThrow();
  if (isError(result)) {
    return 'failed';
  }
  return result;
}

// suppose ApiError is an error class created by `that-error`
import { ApiError, isApiError } from './api-errors';

function somethingThatCouldThrow(): Result<string, InstanceType<typeof ApiError>> {
  if (...) {
    return new ApiError('not_found', 'customer', 'cus_1234567890');
  }
  return 'something';
}

function get(req, res): string {
  const result = somethingThatCouldThrow();
  if (isApiError(result)) {
    return res.send(result.meta.statusCode, {
      message: result.message,
      meta: result.meta
    });
  }
  return res.send(200, result);
}