Upgrade SvelteKit

.eslintrc.cjs

@@ -1,11 +1,16 @@
 module.exports = {
   root: true,
   parser: "@typescript-eslint/parser",
-  extends: ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+  extends: [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier",
+  ],
   plugins: ["svelte3", "@typescript-eslint"],
   rules: {
     "@typescript-eslint/explicit-module-boundary-types": "off",
     "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/no-non-null-assertion": "off",
   },
   ignorePatterns: ["*.cjs", "*.config.js", "*.d.ts"],
   overrides: [{ files: ["*.svelte"], processor: "svelte3/svelte3" }],
@@ -14,7 +19,7 @@ module.exports = {
   },
   parserOptions: {
     sourceType: "module",
-    ecmaVersion: 2019,
+    ecmaVersion: 2020,
   },
   env: {
     browser: true,

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "singleQuote": false,
+  "trailingComma": "es5",
+  "printWidth": 80
+}