config prettier

.prettierrc

@@ -0,0 +1,17 @@
+{
+  "arrowParens": "avoid",
+  "bracketSpacing": false,
+  "htmlWhitespaceSensitivity": "css",
+  "insertPragma": false,
+  "jsxBracketSameLine": false,
+  "jsxSingleQuote": false,
+  "printWidth": 80,
+  "proseWrap": "always",
+  "quoteProps": "as-needed",
+  "requirePragma": false,
+  "semi": false,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "all",
+  "useTabs": false
+}

src/example.js

@@ -1,10 +1,10 @@
-const username = "freddy";
-typeof username === "string";
+const username = 'freddy'
+typeof username === 'string'
 
-if (!("serviceWorker" in navigator)) {
+if (!('serviceWorker' in navigator)) {
   // you have an old browser :-(
 }
 
-const greeting = "hello";
-console.log(`${greeting} world!`);
-[1, 2, 3].forEach(x => console.log(x));
+const greeting = 'hello'
+console.log(`${greeting} world!`)
+;[1, 2, 3].forEach(x => console.log(x))