Best way to understand how to use the definitions are examples here:

• Example in Ext.JS 5.0.1
• Example in Ext.JS 6.0.1 classic
• Example in Ext.JS 6.0.1 modern
• Example in Ext.JS 6.2.0 classic
• Example in Ext.JS 6.2.0 modern
• Example in Ext.JS 7.0.0 classic
• Example in Ext.JS 7.0.0 modern

• Unzips necessary source files, parse (by JS Duck) and generates TypeScript definition files.
• Generates definitions as single file or in multiple files (not to work with one very large file).
• Generate type definitions separately only for classic toolkit or only for modern toolkit, not together, it's not possible yet, not implemented.
• Generates all classes, interfaces and members with optional JS Docs.
• Generates definitions with optional custom documentation base URL to generate JS Docs links into your custom offline documentation.
• Generates definitions with no access modifiers like private, protected or public, because then there is not possible to extend classes like that into interfaces to declare objects to extend class. Access modifiers are declared in JS Docs as @private, @protected or @public.
• Generates definitions always for Ext.JS core, optionally for chosen packages.
• Generates definitions for:
  • All Ext.JS framework classes as it is (including singletons as it is) like:
    • Ext, Ext.Array, Ext.panel.Panel etc...
  • Interfaces for configuration objects (to create classes by Ext.create()) like this:

    • Ext.create('Ext.panel.Panel', <Ext.panel.Panel.Cfg>{
         title: `My Panel Title`,
         closable: true
      });

  • Interfaces to define extended classes like this:

    • Ext.define('App.controller.Main', <Ext.app.Controller.Def>{
         extend: 'Ext.app.Controller',
         config: <Ext.app.Controller.Cfg>{
            refs[{
               ref: 'mainTabs'
               selector: 'tabpanel[cls=main-tabs]'
            }]
         }
      });

  • Interfaces for events objects (to define listeners property)

    • Ext.define('App.view.MainTab', <Ext.panel.Panel.Def & Ext.panel.Panel.Cfg>{
         extend: 'Ext.panel.Panel',
         opened: true,
         listeners: <Ext.panel.Panel.Events>{
            close: function (panel: Ext.panel.Panel, eOpts: object) {
               this.opened = false;
            }
         }
      });

  • Interfaces for all structured method params

    • Ext.Ajax.request(<Ext.data.Connection.methodParams.request.Options>{
         url: "?submit",
         success: function (response?: object, options?: object) {
             console.log(response);
         }
      });

  • Callbacks, mixed things etc...
  • Generates a few unknown empty classes definitions in separate file named ext-X.X.X-classic-unknown.d.ts.
  • Generated definitions could run automcompleting anywhere in your application, more info in this blog post:
    https://blorkfish.wordpress.com/2013/01/28/using-extjs-with-typescript/
  • Generated definitions supports refactoring and code navigation in Visual Studio:-)

• v4.x.x and lower - NOT TESTED, there might be some problems, let me know or make a pull request
• v5.0.1 classic - TESTED, working OK
• v6.0.1 classic - TESTED, working OK
• v6.0.1 modern - TESTED, working OK
• v6.2.0 classic - TESTED, working OK
• v6.2.0 modern - TESTED, working OK (1 error fixed manually)
• v7.0.0 classic - TESTED, working OK
• v7.0.0 modern - TESTED, working OK (5 errors fixed manually)