n8n/packages/workflow/src/ObservableObject.ts

import {
	IDataObject,
	IObservableObject,
} from './';

export interface IObservableOptions {
	ignoreEmptyOnFirstChild?: boolean;
}

export function create(target: IDataObject, parent?: IObservableObject, option?: IObservableOptions, depth?: number): IDataObject {
	depth = depth || 0;

	// Make all the children of target also observeable
	for (const key in target) {
		if (typeof target[key] === 'object') {
			target[key] = create(target[key] as IDataObject, (parent || target) as IObservableObject, option, depth + 1);
		}
	}

	Object.defineProperty(target, '__dataChanged', {
		value: false,
		writable: true,
	});
	return new Proxy(target, {
		deleteProperty(target, name) {
			if (parent === undefined) {
				// If no parent is given mark current data as changed
				(target as IObservableObject).__dataChanged = true;
			} else {
				// If parent is given mark the parent data as changed
				parent.__dataChanged = true;
			}
			return Reflect.deleteProperty(target, name);
		},
		get(target, name, receiver) {
			return Reflect.get(target, name, receiver);
		},
		set(target, name, value) {
			if (parent === undefined) {
				// If no parent is given mark current data as changed
				if (option !== undefined && option.ignoreEmptyOnFirstChild === true && depth === 0
					&& target[name.toString()] === undefined && typeof value === 'object' && Object.keys(value).length === 0) {
				} else {
					(target as IObservableObject).__dataChanged = true;
				}
			} else {
				// If parent is given mark the parent data as changed
				parent.__dataChanged = true;
			}
			return Reflect.set(target, name, value);
		},
	});
}