Improve prettier integration (shd101wyy#284)

* Reconfigure Prettier

* Run "npm audit fix"

* Add eslint to the list of checks

* Improve ignore files

.eslintignore

@@ -0,0 +1,15 @@
+## extensions
+*.*
+!*.js
+# !*.json ← todo integreate with https://www.npmjs.com/package/eslint-plugin-json
+# !*.ts ← todo integrate with https://github.com/typescript-eslint/typescript-eslint
+
+
+## same as in .gitignore
+.vscode-test
+*.vsix
+node_modules
+out
+
+
+## special cases

.eslintrc.json

@@ -1,23 +1,23 @@
 {
-    "env": {
-        "browser": false,
-        "commonjs": true,
-        "es6": true,
-        "node": true
+  "env": {
+    "browser": false,
+    "commonjs": true,
+    "es6": true,
+    "node": true
+  },
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true
     },
-    "parserOptions": {
-        "ecmaFeatures": {
-            "jsx": true
-        },
-        "sourceType": "module"
-    },
-    "rules": {
-        "no-const-assign": "warn",
-        "no-this-before-super": "warn",
-        "no-undef": "warn",
-        "no-unreachable": "warn",
-        "no-unused-vars": "warn",
-        "constructor-super": "warn",
-        "valid-typeof": "warn"
-    }
-}
+    "sourceType": "module"
+  },
+  "rules": {
+    "no-const-assign": "warn",
+    "no-this-before-super": "warn",
+    "no-undef": "warn",
+    "no-unreachable": "warn",
+    "no-unused-vars": "warn",
+    "constructor-super": "warn",
+    "valid-typeof": "warn"
+  }
+}

.gitignore

@@ -1,3 +1,4 @@
+.vscode-test
+*.vsix
 node_modules
 out
-*.vsix

.prettierignore

@@ -0,0 +1,16 @@
+## extensions
+*.*
+!*.js
+!*.json
+!*.md
+!*.ts
+
+
+## same as in .gitignore
+.vscode-test
+*.vsix
+node_modules
+out
+
+
+## special cases