Callbacks fail when calling typescript functions

[Devin Driggs]

Describe the bug
When adding a typescript variable to a callback function, the button which calls the does nothing when clicked.

To Reproduce
Steps to reproduce the behavior:

1. Install in Angular via method 1 under installation (npm install, import)
2. Import Notiflix import { Confirm } from 'notiflix';
3. Create a Confirm as follows and call from a class function:

    Confirm.Show(
        'Notiflix Confirm',
        'Do you agree with me?', 
       'Yes',
        'No', 
       function(){
           // Yes button callback
           this.classvariable = true;
           alert('alert is a typescript function');
       },
       function(){
           // No button callback
           alert('alert is a non-typescript function'); 
       }
   ); 

4. The "No" Button should work, and the "Yes" Button should not do anything

Expected behavior
The yes button sets this.classvariable to true then raises the alert.

Desktop

• OS: Ubuntu 20.04
• Browser: Firefox 81
• Notiflix Version: 2.5.0 (latest)

Not tested on Mobile

[Furkan]

Hi @DDriggs00

Firstly thanks for using Notiflix.

I did not get your expectation at all but maybe you can try the code below and feedback.

Thanks.

Furkan.

 // ....
 var aMysteriousThis = this;

 Confirm.Show(
     'Notiflix Confirm',
     'Do you agree with me?', 
    'Yes',
     'No', 
    function(){
        // Yes button callback
        aMysteriousThis.classvariable = true;
        alert('alert is a typescript function');
    },
    function(){
        // No button callback
        alert('alert is a non-typescript function'); 
    }
); 

[Devin Driggs]

Thank you, This is a good workaround.
I can confirm that it works with typescript 3.8/Angular 9

It would still be nice to not have to do a workaround like this, but I understand this is a pure JS library.