Fiddle with prettier

.prettierrc

@@ -0,0 +1,5 @@
+{
+    "bracketSpacing": false,
+    "semi": true,
+    "singleQuote": true
+}

js/apple1.ts

@@ -272,7 +272,8 @@ declare global {
 
 let _key: byte;
 function _keydown(evt: KeyboardEvent) {
-  const F1 = 112, F2 = 113;
+  const F1 = 112,
+    F2 = 113;
   if (evt.keyCode === F1) {
     cpu.reset();
   } else if (evt.keyCode === F2) {

js/entry1.js

@@ -1,3 +1,3 @@
-import * as Apple1 from "./apple1";
+import * as Apple1 from './apple1';
 
 window.Apple1 = Apple1;

package.json

@@ -7,6 +7,7 @@
     "build": "webpack --mode=production",
     "dev": "webpack-dev-server",
     "lint": "eslint js",
+    "lint-fix": "eslint --fix js",
     "start": "webpack-dev-server",
     "test": "jest"
   },