Add esformatter

Author: raucao

esformatter-config.json

@@ -0,0 +1,18 @@
+{
+  "lineBreak": {
+    "before": {
+      "FunctionDeclaration": ">=2",
+      "FunctionDeclarationOpeningBrace": 0,
+      "FunctionDeclarationClosingBrace": 1,
+      "MethodDefinition": ">=2",
+      "ClassDeclaration": ">=2",
+      "ExportNamedDeclaration": 2
+    },
+    "after": {
+      "FunctionDeclaration": ">=2",
+      "FunctionDeclarationOpeningBrace": 1,
+      "MethodDefinitionClosingBrace": ">=2",
+      "ClassClosingBrace": ">=2"
+    }
+  }
+}

package.json

@@ -14,6 +14,7 @@
   "scripts": {
     "test": "bash scripts/test-all.sh && npm run lint",
     "lint": "eslint --quiet src/",
+    "format": "esformatter --config esformatter-config.json -i src/sync.js",
     "build": "NODE_ENV=production webpack --mode=production",
     "dev": "webpack -w --mode=development",
     "postshrinkwrap": "if [ \"`uname`\" = \"Darwin\" ]; then sed -i '' -e 's/http:\\/\\//https:\\/\\//g' package-lock.json; else sed -i -e 's/http:\\/\\//https:\\/\\//g' package-lock.json; fi",