A strongly typed drop-in replacement for Promises in TypeScript.

• Type-safe rejections greatly improve how errors are surfaced, and makes handling them an absolute joy.

• A simplified .then type signature that disallows inline rejection handling in favour of explict calls to .catch when required.

• Incrementally adoptable and backwards compatible with the weakly typed Promises shipped with TypeScript.

Promise is available from the NPM registry and as a GitHub Package. Whichever source you prefer to use, the installation should remain the same.

# Using NPM
npm install @emphori/promise -S

# Or, using Yarn
yarn add @emphori/promise

import { Promise } from '@emphori/promise'

// (userId: string) => Promise<User, UserNotFound>
function getUser(userId: string): Promise<User, UserNotFound> {
  return User.getById(userId).then((user) => {
    return user ?? Promise.reject(UserNotFound)
  })
}

This project is released under the MIT License. Enjoy responsibly ❤️