Basic configuration for JS code consistency

Using PrettierJS and an opinionated configuration (mainly: no semi, two-spaces indent).

.prettierrc.yaml

@@ -0,0 +1,6 @@
+trailingComma: "es5"
+tabWidth: 2
+semi: false
+singleQuote: true
+printWidth: 88
+quoteProps: "consistent"

package-lock.json

@@ -40,6 +40,7 @@
         "mocha-phantomjs": "^4.0.1",
         "optimist": "~0.4.0",
         "phantomjs": "^1.9.18",
+        "prettier": "^2.8.8",
         "sinon": "^1.10.3",
         "uglify-js": "~3.17.4"
       }
@@ -1920,6 +1921,21 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/prettier": {
+      "version": "2.8.8",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.8.tgz",
+      "integrity": "sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==",
+      "dev": true,
+      "bin": {
+        "prettier": "bin-prettier.js"
+      },
+      "engines": {
+        "node": ">=10.13.0"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/process-nextick-args": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
@@ -4071,6 +4087,12 @@
         "pinkie": "^2.0.0"
       }
     },
+    "prettier": {
+      "version": "2.8.8",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.8.tgz",
+      "integrity": "sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==",
+      "dev": true
+    },
     "process-nextick-args": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",

package.json

@@ -12,6 +12,7 @@
     "mocha-phantomjs": "^4.0.1",
     "optimist": "~0.4.0",
     "phantomjs": "^1.9.18",
+    "prettier": "^2.8.8",
     "sinon": "^1.10.3",
     "uglify-js": "~3.17.4"
   },