Run format check before commit

.gitattributes

@@ -1 +1,2 @@
 node_modules/** -diff linguist-generated=true
+.licenses/** -diff linguist-generated=true

.prettierrc

@@ -0,0 +1,7 @@
+{
+  "arrowParens": "avoid",
+  "bracketSpacing": false,
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "es5"
+}

package-lock.json

@@ -412,6 +412,12 @@
         "semver-compare": "^1.0.0"
       }
     },
+    "prettier": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.0.5.tgz",
+      "integrity": "sha512-7PtVymN48hGcO4fGjybyBSIWDsLU4H4XlvOHfq91pz9kkGlonzwTfYkaIEwiRg/dAJF9YlbsduBAgtYLi+8cFg==",
+      "dev": true
+    },
     "regenerator-runtime": {
       "version": "0.13.5",
       "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.5.tgz",

package.json

@@ -4,11 +4,12 @@
   "license": "MIT",
   "private": true,
   "scripts": {
-    "build": "ncc build src/setup-elixir.js"
+    "build": "ncc build src/setup-elixir.js",
+    "format": "prettier \"src/**/*.js\""
   },
   "husky": {
     "hooks": {
-      "pre-commit": "npm run build && git add dist/"
+      "pre-commit": "npm run format -- --check && npm run build && git add dist/"
     }
   },
   "dependencies": {
@@ -19,6 +20,7 @@
   },
   "devDependencies": {
     "@zeit/ncc": "^0.22.1",
-    "husky": "^4.2.5"
+    "husky": "^4.2.5",
+    "prettier": "^2.0.5"
   }
 }