developer - updated to Typescript 3, use esModuleInterop so no require(..) is needed anymore, and use tslint

Author: gavinr

.gitignore

@@ -58,5 +58,5 @@ typings/
 # dotenv environment variables file
 .env
 
-arcgis-web-appbuilder-2.5.zip
-arcgis-web-appbuilder-2.6.zip
+developer/arcgis-web-appbuilder-*.zip
+tscommand-*

README.md

@@ -26,7 +26,7 @@ If you're not using the builder interface, this version extracts Web AppBuilder,
 1. Install Node.js.
 1. `npm install -g grunt-cli` (see https://gruntjs.com/getting-started)
 1. Clone or download this repo.
-1. Download the Web AppBuilder Developer Edition zip file from [here](https://developers.arcgis.com/web-appbuilder/), and save the zip file named `arcgis-web-appbuilder-2.6.zip` into the `developer/` folder, right at the same level as the `Gruntfile.js`.
+1. Download the Web AppBuilder Developer Edition zip file from [here](https://developers.arcgis.com/web-appbuilder/), and save the zip file named `arcgis-web-appbuilder-2.9.zip` into the `developer/` folder, right at the same level as the `Gruntfile.js`.
 1. In the terminal, browse to the `developer` folder
 1. `npm install`
 1. `grunt init`
@@ -39,6 +39,6 @@ Run `grunt` and as you modify your files, the web app should be updated automati
 
 A few notes about the general ideas and principles that are used in both the `builder` and `developer` versions of this code
 
-- We are currently supporting [TypeScript version 2.6](https://blogs.msdn.microsoft.com/typescript/2017/10/31/announcing-typescript-2-6/).
+- We are currently supporting [TypeScript version 3.0](https://blogs.msdn.microsoft.com/typescript/2018/07/30/announcing-typescript-3-0/).
 - The Declare Decorator is used to tell TypeScript how to translate our Widget class into a dojo/declare syntax that Web AppBuilder is looking for. [Decorators are currently experimental](https://www.typescriptlang.org/docs/handbook/decorators.html) (although widely used) so beware of that small risk. If TypeScript did take out decorators at some point, we would have to change how we're doing this.
 - For more info, see this blog post: [Custom Web AppBuilder Widgets in TypeScript ](https://community.esri.com/people/GRehkemper-esristaff/blog/2017/12/13/custom-web-appbuilder-widgets-in-typescript)

developer/Gruntfile.js

@@ -70,14 +70,14 @@ module.exports = function(grunt) {
     },
     clean: {
       'dist': {
-        'src': 'dist/**'
+        'src': 'dist/*'
       },
       temp: {
-        'src': 'temp/**'
+        'src': 'temp/*'
       }
     },
     unzip: {
-      'temp/': 'arcgis-web-appbuilder-2.6.zip'
+      'temp/': 'arcgis-web-appbuilder-2.9.zip'
     },
     connect: {
       server: {