Setup .prettierignore; reformatted all files with Prettier (#477)

Author: CatChen

.prettierignore

@@ -0,0 +1,5 @@
+# Coverage directory used by tools like istanbul
+coverage
+
+# production
+/lib

.prettierrc.json

@@ -18,5 +18,11 @@
   "importOrderSortIndividualImports": true,
   "importOrderMergeDuplicateImports": true,
   "importOrderBuiltinModulesToTop": true,
-  "importOrderTypeImportsToTop": true
+  "importOrderTypeImportsToTop": true,
+  "overrides": [
+    {
+      "files": "src/*.js",
+      "options": { "parser": "babel-flow" }
+    }
+  ]
 }

index.d.ts

@@ -1,2 +1,3 @@
 import Storage from './lib/Storage';
+
 export default Storage;