Clean up and modernize ESlint configuration (#866)

.eslintrc.js

@@ -0,0 +1,23 @@
+/** @type {import("eslint").Linter.Config } */
+module.exports = {
+  root: true,
+  env: {
+    node: true,
+  },
+  extends: [
+    "eslint:recommended",
+    "plugin:react/recommended",
+    "plugin:@typescript-eslint/base",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:prettier/recommended",
+  ],
+  settings: {
+    react: {
+      version: "detect",
+    },
+  },
+  rules: {
+    "no-unused-vars": "off",
+    "@typescript-eslint/no-unused-vars": ["error"],
+  },
+};

.eslintrc.json

@@ -1,40 +0,0 @@
-{
-  "env": {
-      "node":true,
-      "browser": true,
-      "es6": true
-  },
-  "extends": [
-      "eslint:recommended",
-      "plugin:react/recommended",
-      "plugin:@typescript-eslint/eslint-recommended",
-      "plugin:prettier/recommended"
-  ],
-  "globals": {
-      "Atomics": "readonly",
-      "SharedArrayBuffer": "readonly"
-  },
-  "parser": "@typescript-eslint/parser",
-  "parserOptions": {
-      "ecmaFeatures": {
-          "jsx": true
-      },
-      "ecmaVersion": 2018,
-      "sourceType": "module"
-  },
-  "plugins": [
-      "react",
-      "@typescript-eslint"
-  ],
-  "rules": {
-      "no-unused-vars": "off",
-      "@typescript-eslint/no-unused-vars": [
-          "error"
-      ]
-  },
-  "settings": {
-      "react": {
-          "version": "detect"
-      }
-  }
-}

package.json

@@ -56,8 +56,8 @@
     "@types/react-dom": "^17.0.9",
     "@types/react-router-dom": "^5.1.8",
     "@types/snowpack-env": "^2.3.4",
-    "@typescript-eslint/eslint-plugin": "^4.28.1",
-    "@typescript-eslint/parser": "^4.28.3",
+    "@typescript-eslint/eslint-plugin": "^4.28.4",
+    "@typescript-eslint/parser": "^4.28.4",
     "cypress": "7.7.0",
     "decompress": "^4.2.1",
     "decompress-targz": "^4.1.1",