advanced-service-locator

Class based ServiceLocator for use with TypeScript or JS.

More about ServiceLocator pattern

Install

npm i advanced-service-locator

Import

//es5
const {ServiceLocator, ILocatable, ILocator} = require("advanced-service-locator");
//es6+ and ts
import {ServiceLocator, ILocatable, ILocator} from "advanced-service-locator";

Example classes

class TestClass implements ILocatable {

    init(locator: ILocator): void {
        //will be called after instantiation
    }

    getMessage(): string {
        return "Hello from ServiceLocator!";
    }
}

class TestClassCustom extends TestClass {
    getMessage(): string {
        return "This is custom message!";
    }
}

Locate an instance

const locator = new ServiceLocator();
const a = locator.locate(TestClass);

Class mapping

const locator = new ServiceLocator();
locator.mapClass(TestClass).to(TestClassCustom);

const a = locator.locate(TestClass);

console.log(a.getMessage()); //will output "This is custom message!"

Map class as a singleton

const locator = new ServiceLocator();
locator.mapClass(TestClass).asSingleton();

const a = locator.locate(TestClass);
const b = locator.locate(TestClass);
console.log(a === b); //will output "true"

Recommend to use as a singleton

class Locator {
    static readonly instance = new ServiceLocator();
}

const a = Locator.instance.locate(TestClass);