scripting: Update equal().

Author: freezy

lib/scripting/vbs-helper.spec.ts

@@ -195,8 +195,10 @@ describe('The scripting VBS Helper', () => {
 	});
 
 	it('should compare equals using "equals"', () => {
-		const value = vbsHelper.equals(5, 5);
-		expect(value).to.equal(true);
+		expect(vbsHelper.equals(5, 5)).to.equal(true);
+		expect(vbsHelper.equals(undefined, new VbsUndefined())).to.equal(true);
+		expect(vbsHelper.equals(new VbsUndefined(), undefined)).to.equal(true);
+		expect(vbsHelper.equals(new VbsUndefined(), new VbsUndefined())).to.equal(true);
 	});
 
 	it('should compare not equal using "equals"', () => {

lib/scripting/vbs-helper.ts

@@ -126,7 +126,27 @@ export class VBSHelper {
 	 */
 
 	public equals(value1: any, value2: any): boolean {
-		return (value1 === value2);
+		// tslint:disable-next-line:triple-equals
+		if (value1 == value2) {
+			return true;
+		}
+
+		// VbsUndefined == undefined
+		if (typeof value1 === 'object' && value1.__isUndefined && typeof value2 === 'undefined') {
+			return true;
+		}
+
+		// undefined == VbsUndefined
+		if (typeof value2 === 'object' && value2.__isUndefined && typeof value1 === 'undefined') {
+			return true;
+		}
+
+		// VbsUndefined == VbsUndefined
+		if (typeof value1 === 'object' && value1.__isUndefined && typeof value2 === 'object' && value2.__isUndefined) {
+			return true;
+		}
+
+		return false;
 	}
 
 	/**

lib/scripting/vbs-undefined.ts

@@ -36,6 +36,9 @@ export class VbsUndefined implements ProxyHandler<any> {
 		if (typeof p === 'symbol' || ['valueOf', 'toString', 'inspect', '__errGet', '__errSet'].includes(p as string)) {
 			return Reflect.get(target, p);
 		}
+		if (p === '__isUndefined') {
+			return true;
+		}
 		ERR.Raise(this.__errGet || new VbsError(`ReferenceError: Cannot get property "${String(p)}" of undefined array element.`, 9));
 		return this;
 	}