update eslint stuff

.eslintrc.cjs

@@ -1,25 +1,24 @@
 module.exports = {
   root: true,
   parser: '@typescript-eslint/parser',
-  extends: [
-    'eslint:recommended',
-    // 'plugin:@typescript-eslint/recommended',  // todo: https://stackoverflow.com/questions/57597142/how-to-run-typescript-eslint-on-ts-files-and-eslint-on-js-files-in-the-same-pr
-    'prettier',
-  ],
-  plugins: ['svelte3', '@typescript-eslint'],
+  extends: ['eslint:recommended', 'plugin:svelte/recommended', 'prettier'],
+  plugins: ['@typescript-eslint'],
   ignorePatterns: ['*.cjs'],
-  overrides: [{ files: ['*.svelte'], processor: 'svelte3/svelte3' }],
-  settings: {
-    'svelte3/typescript': () => require('typescript'),
-  },
+  overrides: [
+    {
+      files: ['*.svelte'],
+      parser: 'svelte-eslint-parser',
+      // Parse the `<script>` in `.svelte` as TypeScript by adding the following configuration.
+      parserOptions: {
+        parser: '@typescript-eslint/parser',
+      },
+    },
+  ],
   parserOptions: {
     sourceType: 'module',
     ecmaVersion: 2019,
-  },
-  rules: {
-    'no-unused-expressions': 'warn',
-    'no-constant-binary-expression': 'warn',
-    'no-sequences': 'warn',
+    project: './tsconfig.json',
+    extraFileExtensions: ['.svelte'], // This is a required setting in `@typescript-eslint/parser` v4.24.0.
   },
   env: {
     browser: true,