Method register

src/Factory.js:43–53

* Registers invokable to specified identifier. * @param {string} identifier * @param {class} invokable * @throws Throws an error if identifier already exists. * @return {Factory} Fluent interface

(identifier, invokable)

   * @return {Factory} Fluent interface
   */
  register (identifier, invokable) {
    if (this.exists(identifier)) {
      throw new Error(
        'Invokable can\'t be registered. ' +
        `Identifier ${identifier} already exists.`)
    }
    // register invokable
    this._identifiers.push(identifier)
    this._invokables.push(invokable)
    return this
  }

  /**
   * Returns true, if given identifier exists.