react-native-firestack/lib/utils/singleton.js at master · MarsCodeJS/react-native-firestack · GitHub

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'use strict';

const Symbol = require('es6-symbol');

class Singleton {
  constructor() {
    let Class = this.constructor;

    if(!Class[this.singleton]) {
      Class[this.singleton] = this;
    }

    return Class[this.singleton];
  }

  static get instance() {
    if(!this[this.singleton]) {
      this[this.singleton] = new this;
    }

    return this[this.singleton];
  }

  static set instance(instance) {
    this[this.singleton] = instance;
    return this[this.singleton];
  }

  static get singleton() {
    return Symbol(this.namespace);
  }

  static reset() {
    delete this[this.singleton]
  }
}

export default Singleton;