chore: upgrade typescript-eslint to v8

.eslintrc

@@ -2,9 +2,6 @@
   "root": true,
   "parser": "@typescript-eslint/parser",
   "plugins": ["@typescript-eslint"],
-  "parserOptions": {
-    "warnOnUnsupportedTypeScriptVersion": false
-  },
   "extends": [
     "eslint:recommended",
     "plugin:@typescript-eslint/recommended",
@@ -16,5 +13,13 @@
     "@typescript-eslint/no-explicit-any": 0,
     "@typescript-eslint/consistent-type-imports": 2
   },
+  "overrides": [
+    {
+      "files": ["type-check/**/*.ts"],
+      "rules": {
+        "@typescript-eslint/no-unused-vars": "off"
+      }
+    }
+  ],
   "ignorePatterns": ["src/type/**/*.ts"]
 }

package.json

@@ -71,10 +71,10 @@
     "@types/glob": "^8.1.0",
     "@types/jest": "^29.5.2",
     "@types/node": "^24.13.3",
-    "@typescript-eslint/eslint-plugin": "^5.60.1",
-    "@typescript-eslint/parser": "^5.60.1",
+    "@typescript-eslint/eslint-plugin": "^8.66.0",
+    "@typescript-eslint/parser": "^8.66.0",
     "babel-loader": "^9.1.2",
-    "eslint": "^8.43.0",
+    "eslint": "^8.57.1",
     "eslint-config-prettier": "^8.8.0",
     "glob": "^10.3.1",
     "husky": "^8.0.3",

src/countBy.ts

@@ -6,7 +6,11 @@ import type Key from "./types/Key";
 import type ReturnValueType from "./types/ReturnValueType";
 
 function incSel<B extends Key>(parent: { [K in B]: number }, k: B) {
-  parent[k] ? parent[k]++ : (parent[k] = 1);
+  if (parent[k]) {
+    parent[k]++;
+  } else {
+    parent[k] = 1;
+  }
   return parent;
 }
 

src/indexBy.ts

@@ -1,9 +1,7 @@
 import { AsyncFunctionException } from "./_internal/error";
 import { isAsyncIterable, isIterable, isPromise } from "./_internal/utils";
 import reduce from "./reduce";
-import type Cast from "./types/Cast";
 import type Equals from "./types/Equals";
-import type { GetKeyOf } from "./types/GetKeyOf";
 import type IterableInfer from "./types/IterableInfer";
 import type Key from "./types/Key";
 import type ReturnValueType from "./types/ReturnValueType";

test/Lazy/concurrent.spec.ts

@@ -131,8 +131,8 @@ describe("concurrent", function () {
           yield delay(1000, 3);
           yield (async () => {
             throw "err";
-          })(),
-            yield delay(1000, 4);
+          })();
+          yield delay(1000, 4);
           yield delay(1000, 5);
         })(),
       ),

test/Lazy/concurrentPool.spec.ts

@@ -95,8 +95,8 @@ describe("concurrentPool", function () {
           yield delay(100, 3);
           yield (async () => {
             throw "err";
-          })(),
-            yield delay(100, 4);
+          })();
+          yield delay(100, 4);
           yield delay(1000, 5);
         })(),
       ),

test/indexBy.spec.ts

@@ -6,7 +6,6 @@ import {
   indexBy,
   map,
   pipe,
-  reduce,
   toArray,
   toAsync,
 } from "../src";