Typescript wrap ActiveX function call in promise or call asynchronously

Question

I am creating an intranet web application using the Angular framework with Typescript.

The application needs to work with the client's machine so I have implemented some COM functionality called using ActiveX technology (we use Internet Explorer so it works fine).

I have 2 functions:

openApp - which copies a file from the server to the local machine

getInstalledVersion - reads version information from the local coy of the file

What I would like to do is after openApp is called I would like to call getInstalledVersion (to get the version info for the newly copied file). Obviously I want to ensure the copy process is complete before I call getInstalledVersion.

This sounds like a case for either wrapping openApp in a Promise, or finding some other way to call getInstalledVersion only once openApp has completed.

Could somebody point me in a direction for how I might achieve this?

Existing code below:

export class AppService implements IAppService {

    private _appServiceClass: any;

    constructor() {
        this._appServiceClass = new ActiveXObject("BeaufortAppStoreClientProcessing.Services.AppServiceJsonWrapper");
    }

    openApp(app: IApp, sourceRootFolder: string, destinationRootFolder: string): void {
        var jsonApp = JSON.stringify(app);
        this._appServiceClass.OpenApp(jsonApp, app.AppType.AppTypeID, sourceRootFolder, destinationRootFolder);

    // Want to call getInstalledVersion here after openApp succeeds.

    }

    getInstalledVersion(app: IApp): string {
        var version: string;
        var appType = app.AppType.AppTypeID;
        switch (appType) {
            case 1:
                var jsonApp = JSON.stringify(app);
                version = this._appServiceClass.GetInstalledVersion(jsonApp).toString();
                break;
            case 2:
                version = "n/a";
                break;
            default:
                version = "Incorrect AppType";
                break;
            }
        return version;
    }
}