Initial commit to release

packages/workflow/src/ObservableObject.ts

@@ -0,0 +1,54 @@
+
+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);
+		},
+	});
+}