algopat/dist/patterns/singleton/singleton.pattern.js

Utility library for implementing common design patterns and algorithms

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Singleton = void 0;
class Singleton {
    constructor(factory) {
        if (Singleton._instance) {
            throw new Error(`${this.constructor.name} is a singleton class. Use instance()`);
        }
        Singleton._instance = factory.make();
    }
    static instance(factory) {
        if (this._instance === null) {
            if (!factory)
                throw new Error(`${this.prototype.constructor.name} has not been initialized with a factory`);
            this._instance = factory.make();
        }
        return this._instance;
    }
}
exports.Singleton = Singleton;
Singleton._instance = null;
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