config prettier

.prettierignore

@@ -0,0 +1,7 @@
+node_modules
+coverage
+dist
+build
+.build
+
+# etc...

.prettierrc

@@ -0,0 +1,12 @@
+{
+  "arrowParens": "avoid",
+  "bracketSpacing": false,
+  "jsxBracketSameLine": false,
+  "printWidth": 80,
+  "proseWrap": "always",
+  "semi": false,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "all",
+  "useTabs": false
+}

src/example.js

@@ -1,11 +1,11 @@
-const name = "Freddy";
+const name = 'Freddy'
-typeof name === "string";
+typeof name === 'string'
 
-if (!("serviceWorker" in navigator)) {
+if (!('serviceWorker' in navigator)) {
   // you have an old browser :-(
 }
 
-const greeting = "hello";
+const greeting = 'hello'
-console.log(`${greeting} world!`);
+console.log(`${greeting} world!`)
 
-[(1, 2, 3)].forEach(x => console.log(x));
+;[(1, 2, 3)].forEach(x => console.log(x))