refactor(style): Update ESLint & Prettier. Modernize configs. Run Pre…

…ttier. (dcmjs-org#275)

* chore: update eslint, prettier, modernize configs

* chore: run prettier on whole codebase

.eslintrc.json

@@ -1,18 +1,18 @@
 {
   "env": {
-  "browser": true,
+    "browser": true,
     "node": true,
     "es6": true,
     "jest": true
   },
+
   "extends": [
-    "eslint:recommended"
+    "eslint:recommended",
+    "prettier"
   ],
-  "rules": {
-    "indent": [
-      "error",
-      4
-    ]
-  },
-  "parser": "babel-eslint"
+
+  "parserOptions": {
+    "ecmaVersion": 11,
+    "sourceType": "module"
+  }
 }

.prettierrc

@@ -1,4 +1,5 @@
 {
     "tabWidth": 4,
-    "semi": true
+    "trailingComma": "none",
+    "arrowParens": "avoid"
 }

.vscode/settings.json

@@ -1,3 +1,8 @@
 {
-  "editor.formatOnSave": true
+
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "[javascript]": {
+    "editor.tabSize": 4,
+    "editor.formatOnSave": true
+  },
 }