Class Observable

packages/core/data/observable/index.ts:101–515

 * and you have to migrate to the "data/observable" `fromObject({})` or the `fromObjectRecursive({})` functions.
 */
export class Observable {
	/**
	 * String value used when hooking to propertyChange event.
	 * @nsEvent  {PropertyChangeData} propertyChange
	 */
	public static propertyChangeEvent = 'propertyChange';

	/**
	 * Alternative to `instanceof ViewBase`.
	 * @private
	 */
	public _isViewBase: boolean;

	private readonly _observers: ListEntryMap = {};

	/**
	 * Gets the value of the specified property.
	 */
	public get(name: string): any {
		return this[name];
	}

	/**
	 * Updates the specified property with the provided value.
	 */
	public set(name: string, value: any): void {
		// TODO: Parameter validation
		const oldValue = this[name];
		if (this[name] === value) {
			return;
		}

		const newValue = WrappedValue.unwrap(value);
		this[name] = newValue;
		this.notifyPropertyChange(name, newValue, oldValue);
	}

	/**
	 * Updates the specified property with the provided value and raises a property change event and a specific change event based on the property name.
	 */
	public setProperty(name: string, value: any): void {
		const oldValue = this[name];
		if (this[name] === value) {
			return;
		}
		this[name] = value;
		this.notifyPropertyChange(name, value, oldValue);

		const specificPropertyChangeEventName = name + 'Change';
		if (this.hasListeners(specificPropertyChangeEventName)) {
			const eventData = this._createPropertyChangeData(name, value, oldValue);
			eventData.eventName = specificPropertyChangeEventName;
			this.notify(eventData);
		}
	}

	/**
	 * Adds a listener for the specified event name.