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@ood/singleton

v1.1.2

Published

Singleton decorator. No constructor monkeypatching. Zero dependencies. Built with TypeScript.

Downloads

392

Readme

Singleton

Singleton decorator. No constructor monkeypatching. Zero dependencies. Built with TypeScript.

Installation

  1. Run

    npm i @ood/singleton

    or

    yarn add @ood/singleton
  2. (Optional) Enable decorators

    1. If you use TypeScript set in you tsconfig.json

      {
        "compilerOptions": {
          "experimentalDecorators": true
        }
      }
    2. If you use JavaScript configure your babel to support decorators and class properties

Quick start

import { singleton } from "@ood/singleton" 

@singleton
class Test {}

new Test() === new Test() // returns `true`

Usage without decorators

import { singleton } from "@ood/singleton"

class Test {}
const TestSingleton = singleton(Test)

new TestSingleton() === new TestSingleton() // returns `true`

Inheritance

Any child of your singleton will not be a singleton.

import { singleton } from "@ood/singleton"

@singleton
class Parent {}

class Child extends Parent {}

new Child() === new Child() // returns `false`

// If you want to make `Child` a singleton as well, apply `singleton` decorator directly to it
@singleton
class ChildSingleton extends Parent {}

new ChildSingleton() === new ChildSingleton() // returns `true`

In depth

singleton decorator wraps your class with a Proxy and a construct trap to override class' creation logic.

Your singleton instance is always available as a static property of a class by key SINGLETON_KEY.

import { singleton, SINGLETON_KEY } from "@ood/singleton"

@singleton
class Test {}

const instance = new Test()
Test[SINGLETON_KEY] === instance // returns `true`