TypeScript icon, indicating that this package has built-in type declarations

0.3.10 • Public • Published

Common interfaces and types for typescript, such Predicate or Maybe. This is of no use if you do not use typescript. I made this because I often ended up needing and writing the same types for my projects.

Types are used only when transpiling, they do not end up in the transpiled code. Ie, your transpiled code does not get bigger by using this library.


Documentation and list of all the interfaces and types.


The drill:

npm install --save andross

Now you can import the types


All available and types are exposed from the main file.

// import this lib
import { Predicate, Maybe, Comparator } from "andross";
// Use the interfaces and type.
class Users<T> {
  private users: Users[];
  constructor() {
    this.users = [];    
  getUserById(id: number): Maybe<User> {
    return this.users.find(user => === id);
  }npx tslint -c tslint.json main.ts
  getUsers(filter: Predicate<User>): User[] {
    return this.users.filter(filter);
  sort(comparator: Comparator<T>) {


As of version 0.3.4, this package also includes some predefined enumerations. Since these are not purely type definitions and contribute to the size of a bundle, they are placed in a separate file and not included in the main file:

import { CardinalDirection4 } from "andross/enum";
const north = CardinalDirection4.North;

See the documentation for a list of all interfaces and types with a short description.


  • 0.3.10 Added some types for discriminated (tagged) unions.
  • 0.3.9 Added types several types for extracting keys from objects, such as PickPartial, PickMatching, PickAssignable, PartialKeys, AssignableKeys, RequiredFor.
  • 0.3.8 Added type Voidable.
  • 0.3.7 Added types ReversibleFunction, ReversibleBiFunction, ReversibleTriFunction.
  • 0.3.6 Added type Equatable and added defaults for type parameters of BiConsumer/TriConsumer and BiSupplier/TriSupplier.
  • 0.3.5 Added an optional type parameter K to StringObject, allowing you to restrict the available keys. Also removed the *.ts source files from the NPM package. The source file made webpack with ts-loader work incorrectly.
  • 0.3.4 Added types RectSize, Rectangle, MinMaxRectangle, CardinalDirection4/8/16/32, ReadonlyFor, ReadonlyExcept, MatchingKeys.
  • 0.3.3 Added types PartialExcept (makes every property but the given optional) and PartialFor (makes every given property optional).
  • 0.3.2 Added RemoveFrom. Tuple types generics now default to the previous type, ie. Pair<string> is equivalent to Pair<string, string>.
  • 0.3.1 Added Builder type.
  • 0.3.0 Added Vector types (Vector1, Vector2, Vector3, Vector4, Vector5), StringObject and NumberObject, as well as Omit and Overwrite
  • 0.2.0 Added JSON types.


May not work on Windows.

git clone
cd js-andross
npm install
npm run build

Teh name

The great (inter-)face of Andross.



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