[)

IAUX Result Type

A generic Result interface for returning type-safe responses and errors.

Installation

> yarn add @internetarchive/result-type

Usage

Result

Result is a generic interface for returning a response with typesafe value and error handling.

import { Result } from '@internetarchive/result-type';

enum FooErrorType {
  networkError,
  decodingError,
}

class FooError extends Error {
  type?: FooErrorType;

  constructor(type: FooErrorType, message: string?) {
    super(message);
    this.type = type;
  }
}

// success
const result: Result<string, FooError> = { success: 'foo' };

const value = result.success;
if (value) {
  console.debug('do something with `value`');
}

// error
const result: Result<string, FooError> = {
  error: new FooError(FooErrorType.decodingError),
};

if (result.error) {
  switch (result.error) {
    case FooErrorType.networkError:
      console.debug('handle network error');
      break;
    case FooErrorType.decodingError:
      console.debug('handle decoding error');
      break;
    default:
      console.debug('unknown error');
  }
}

Local Demo with web-dev-server

yarn start

To run a local development server that serves the basic demo located in demo/index.html

Testing with Web Test Runner

To run the suite of Web Test Runner tests, run

yarn run test

To run the tests in watch mode (for <abbr title="test driven development">TDD</abbr>, for example), run

yarn run test:watch

Linting with ESLint, Prettier, and Types

To scan the project for linting errors, run

yarn run lint

You can lint with ESLint and Prettier individually as well

yarn run lint:eslint

yarn run lint:prettier

To automatically fix many linting errors, run

yarn run format

You can format using ESLint and Prettier individually as well

yarn run format:eslint

yarn run format:prettier

Tooling configs

For most of the tools, the configuration is in the package.json to reduce the amount of files in your project.

If you customize the configuration a lot, you can consider moving them to individual files.