prettier 2

Summary:
Quick notes:

- This looks worse than it is. It adds mandatory parentheses to single argument lambdas. Lots of outrage on Twitter about it, personally I'm {emoji:1f937_200d_2642} about it.
- Space before function, e.g. `a = function ()` is now enforced. I like this because both were fine before.
- I added `eslint-config-prettier` to the config because otherwise a ton of rules conflict with eslint itself.

Close https://github.com/facebook/flipper/pull/915

Reviewed By: jknoxville

Differential Revision: D20594929

fbshipit-source-id: ca1c65376b90e009550dd6d1f4e0831d32cbff03

desktop/app/src/chrome/LocationsButton.tsx

@@ -49,12 +49,7 @@ const shortenText = (text: string, MAX_CHARACTERS = 30): string => {
   if (text.length <= MAX_CHARACTERS) {
     return text;
   } else {
-    return (
-      text
-        .split('')
-        .slice(0, MAX_CHARACTERS)
-        .join('') + '...'
-    );
+    return text.split('').slice(0, MAX_CHARACTERS).join('') + '...';
   }
 };
 
@@ -94,7 +89,7 @@ class LocationsButton extends Component<Props, State> {
   };
 
   updateBookmarks = () => {
-    readBookmarksFromDB().then(bookmarksMap => {
+    readBookmarksFromDB().then((bookmarksMap) => {
       const bookmarks: Array<Bookmark> = [];
       bookmarksMap.forEach((bookmark: Bookmark) => {
         bookmarks.push(bookmark);