Added ESLint and Prettier.

.eslintrc

@@ -0,0 +1,32 @@
+{
+    "parserOptions": {
+        "ecmaVersion": 10,
+        "sourceType": "module",
+        "ecmaFeatures": {
+            "impliedStrict": true
+        }
+    },
+    "env": {
+        "browser": true,
+        "es6": true,
+        "node": true,
+        "jquery": true,
+        "worker": true,
+        "mocha": true,
+        "serviceworker": true
+    },
+    "globals": {
+        "PIXI": false,
+        "TweenLite": false,
+        "TweenMax": false,
+        "TimelineLite": false,
+        "TimelineMax": false,
+        "d3": false,
+        "SystemJS": false,
+        "app": true
+    },
+    "plugins": [
+        "prettier"
+    ],
+    "extends": ["eslint:recommended", "plugin:prettier/recommended"]
+}

.eslintrc.json

@@ -1,35 +0,0 @@
-{
-    "parserOptions": {
-        "ecmaVersion": 10,
-        "sourceType": "module",
-        "ecmaFeatures": {
-            "impliedStrict": true
-        }
-    },
-    "plugins": [
-        "mocha"
-    ],
-    "env": {
-        "browser": true,
-        "es6": true,
-        "node": true,
-        "jquery": true
-    },
-    "globals": {
-        "PIXI": false,
-        "TweenLite": false,
-        "TweenMax": false,
-        "TimelineLite": false,
-        "TimelineMax": false,
-        "SystemJS": false
-    },
-    "extends": "eslint:recommended",
-    "rules": {
-        "semi": ["error", "never"],
-        "quotes": ["warn", "single", {"allowTemplateLiterals": true}],
-        "no-console": "warn",
-        "no-unused-vars": ["warn", {"argsIgnorePattern": "^(e|event|points|ended)$"}],
-        "indent": ["warn", 4, {"SwitchCase": 1}],
-        "mocha/no-exclusive-tests": "error"
-    }
-}

.prettierrc

@@ -0,0 +1,6 @@
+{
+    "singleQuote": true,
+    "jsxSingleQuote": true,
+    "tabWidth": 4,
+    "semi": false
+}

lib/app.js

@@ -9,11 +9,15 @@ 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 {
@@ -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]
         }

package.json

@@ -21,11 +21,15 @@
     "license": "LGPL-3.0-or-later",
     "devDependencies": {
         "@pixi/jsdoc-template": "^2.4.2",
+        "eslint": "^6.0.1",
+        "eslint-config-prettier": "^6.0.0",
+        "eslint-plugin-prettier": "^3.1.0",
         "gulp": "^4.0.2",
         "gulp-concat": "^2.6.1",
         "gulp-rename": "^1.4.0",
         "gulp-replace": "^1.0.0",
-        "gulp-uglify": "^3.0.2"
+        "gulp-uglify": "^3.0.2",
+        "prettier": "^1.18.2"
     },
     "dependencies": {
         "fs-extra": "^8.0.1",