chore: add and fix prettier

.eslintrc.js

@@ -6,6 +6,8 @@ module.exports = {
   },
   extends: [
     'plugin:@typescript-eslint/recommended',
+    'prettier/@typescript-eslint',
+    'plugin:prettier/recommended', // Enables eslint-plugin-prettier and eslint-config-prettier. This will display prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.
   ],
   rules: {},
 };

.prettierrc.js

@@ -0,0 +1,7 @@
+module.exports = {
+  semi: true,
+  trailingComma: "all",
+  singleQuote: true,
+  printWidth: 120,
+  tabWidth: 2,
+};

package-lock.json

@@ -5027,6 +5027,12 @@
       "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
       "dev": true
     },
+    "prettier": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.1.2.tgz",
+      "integrity": "sha512-16c7K+x4qVlJg9rEbXl7HEGmQyZlG4R9AgP+oHKRMsMsuk8s+ATStlf1NpDqyBI1HpVyfjLOeMhH2LvuNvV5Vg==",
+      "dev": true
+    },
     "prettier-linter-helpers": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/prettier-linter-helpers/-/prettier-linter-helpers-1.0.0.tgz",

package.json

@@ -50,9 +50,10 @@
     "jest": "24.9.0",
     "lint-staged": "^10.4.0",
     "ts-jest": "^26.3.0",
-    "typescript": "^4.0.2"
+    "typescript": "^4.0.2",
+    "prettier": "^2.1.1"
   },
   "dependencies": {
     "xmldom": "^0.3.0"
   }
-}
+}