Update eslint

I was having a bunch of dependency conflicts and eslint seemed to be the
culprit so I just removed it and set it up again, since it seems things
have changed quite a bit.

eslint.config.mjs

@@ -0,0 +1,72 @@
+import { fixupConfigRules } from "@eslint/compat";
+import globals from "globals";
+import tsParser from "@typescript-eslint/parser";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import js from "@eslint/js";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all
+});
+
+export default [...fixupConfigRules(compat.extends(
+  "eslint:recommended",
+  "plugin:@typescript-eslint/recommended",
+  "plugin:import/recommended",
+  "plugin:import/typescript",
+  "plugin:prettier/recommended",
+  "prettier",
+)), {
+  languageOptions: {
+    globals: {
+      ...globals.browser,
+      ...globals.jest,
+      ...globals.node,
+    },
+
+    parser: tsParser,
+    ecmaVersion: 2018,
+    sourceType: "module",
+  },
+
+  settings: {
+    "import/resolver": {
+      typescript: {
+        alwaysTryTypes: true,
+      },
+    },
+  },
+
+  rules: {
+    "@typescript-eslint/no-unused-vars": ["error", {
+      args: "none",
+    }],
+
+    "no-dupe-class-members": "off",
+    "@typescript-eslint/no-use-before-define": "off",
+    "@typescript-eslint/no-non-null-assertion": "off",
+    "@typescript-eslint/ban-types": "off",
+    "@typescript-eslint/no-var-requires": "off",
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/no-extra-semi": "off",
+    "@typescript-eslint/no-require-imports": "off",
+    "@typescript-eslint/no-unused-vars": "off", // TODO: Fix these.
+    eqeqeq: "error",
+
+    "import/order": ["error", {
+      alphabetize: {
+        order: "asc",
+      },
+
+      groups: [["builtin", "external", "internal"], "parent", "sibling"],
+    }],
+
+    "no-async-promise-executor": "off",
+  },
+}];