Add ESLint for code linting and formatting via ESLint Stylistic (#70)

Author: FifthTundraG

eslint.config.mjs

@@ -0,0 +1,36 @@
+import js from "@eslint/js";
+import globals from "globals";
+import tseslint from "typescript-eslint";
+import { defineConfig } from "eslint/config";
+import stylistic from "@stylistic/eslint-plugin";
+
+export default defineConfig([
+    {
+        ignores: ["public/**/*.js"],
+    },
+    {
+        files: ["**/*.{js,mjs,cjs,ts,mts,cts}"],
+        plugins: {
+            js,
+            "@stylistic": stylistic
+        },
+        extends: ["js/recommended"],
+        languageOptions: { globals: globals.browser },
+        rules: {
+            "eqeqeq": ["error", "always"],
+            "prefer-const": ["error", {
+                "destructuring": "any",
+                "ignoreReadBeforeAssign": false
+            }],
+            "@stylistic/semi": ["error", "always", { "omitLastInOneLineBlock": true }],
+            "@stylistic/no-extra-semi": "error",
+            "@stylistic/semi-spacing": "error",
+            "@stylistic/semi-style": "error",
+            "@stylistic/quotes": ["error", "double"],
+            "@stylistic/indent": ["error", 4],
+            "@stylistic/space-before-function-paren": ["error", "never"],
+            "@stylistic/key-spacing": "error"
+        }
+    },
+    tseslint.configs.recommended,
+]);