Added ESLint and Prettier.

lib/app.js

@@ -9,16 +9,20 @@ export class IApp extends Interface {
     /** Build the app by registering event handlers,
      *   adding DOM elements, instanciating templates, etc...
      */
-    setup() { return this }
+    setup() {
+        return this
+    }
 
     /** Run the application by starting a main loop, ...
      */
-    run() { return this }
+    run() {
+        return this
+    }
 }
 
 export default class App extends Object {
     /** Override this method to build your app.
-    */
+     */
     setup() {
         return this
     }
@@ -48,8 +52,7 @@ export default class App extends Object {
             this.allTests()
             var end = performance.now()
             return ['ok', end - start]
-        }
-        catch(e) {
+        } catch (e) {
             console.trace()
             return ['Tests failed', e.message]
         }