Add prettier as an npm dev dependency (#18044)

For this initial commit I only chose to apply the formatting to a
single JS file.

Author: sbc100

.circleci/config.yml

@@ -318,7 +318,9 @@ jobs:
     steps:
       - checkout
       - npm-install
-      - run: npm run lint
+      - run: |
+          npm run lint
+          npm run check
   test-sanity:
     executor: bionic
     steps:

.eslintrc.yml

@@ -3,7 +3,7 @@ env:
   es2020: true
   node: true
 extends:
-  - google
+  - prettier
 parserOptions:
   ecmaVersion: 12
 ignorePatterns:

.prettierrc.yml

@@ -0,0 +1,4 @@
+singleQuote: true
+bracketSpacing: false
+arrowParens: avoid
+printWidth: 100

package-lock.json

@@ -3,7 +3,8 @@
   "devDependencies": {
     "es-check": "^6.2.1",
     "eslint": "^8.16.0",
-    "eslint-config-google": "^0.14.0",
+    "eslint-config-prettier": "^8.5.0",
+    "prettier": "^2.7.1",
     "source-map": "0.7.3",
     "ws": "^8.6.0"
   },
@@ -14,6 +15,8 @@
     "wasm2c": "1.0.0"
   },
   "scripts": {
-    "lint": "eslint ."
+    "lint": "eslint .",
+    "fmt": "prettier --write tools/acorn-optimizer.js",
+    "check": "prettier --check tools/acorn-optimizer.js"
   }
 }