eslint: add github/array-foreach rule

packages/utils/lib/cases.ts

@@ -20,13 +20,13 @@ export default async function readYamlCases(cfg: Record<string, any> = {}, check
         }
         if (cfg.interactor) config.interactor = checkFile(cfg.interactor, 'Cannot find interactor {0}.');
         if (cfg.validator) config.validator = checkFile(cfg.validator, 'Cannot find validator {0}.');
-        ['judge', 'user'].forEach((n) => {
+        for (const n of ['judge', 'user']) {
             const conf = cfg[`${n}_extra_files`];
-            if (!conf) return;
+            if (!conf) continue;
             if (conf instanceof Array) {
                 config[`${n}_extra_files`] = conf.map((file) => checkFile(file, `Cannot find ${n} extra file {0}.`));
             } else throw new Error(`Invalid ${n}_extra_files config.`);
-        });
+        }
     }
     if (cfg.cases?.length) {
         config.subtasks = [{

packages/utils/lib/lang.ts

@@ -27,7 +27,7 @@ export interface LangConfig {
 export function parseLang(config: string): Record<string, LangConfig> {
     const file = yaml.load(config) as Record<string, LangConfig>;
     if (typeof file === 'undefined' || typeof file === 'string' || typeof file === 'number') throw new Error();
-    Object.keys(file).filter((i) => i.startsWith('_')).forEach((k) => delete file[k]);
+    for (const key of Object.keys(file)) if (key.startsWith('_')) delete file[key];
     for (const key in file) {
         const entry = file[key];
         if (key.includes('.')) {

packages/utils/lib/utils.ts

@@ -36,9 +36,7 @@ export function folderSize(folderPath: string) {
                 size += stats.size;
                 const files = fs.readdirSync(p);
                 if (Array.isArray(files)) {
-                    files.forEach((file) => {
-                        _next(path.join(p, file));
-                    });
+                    for (const file of files) _next(path.join(p, file));
                 }
             }
         }
@@ -247,9 +245,9 @@ export function CallableInstance(property = '__call__') {
     else func = this.constructor.prototype[property];
     const apply = function __call__(...args) { return func.apply(apply, ...args); };
     Object.setPrototypeOf(apply, this.constructor.prototype);
-    Object.getOwnPropertyNames(func).forEach((p) => {
+    for (const p of Object.getOwnPropertyNames(func)) {
         Object.defineProperty(apply, p, Object.getOwnPropertyDescriptor(func, p));
-    });
+    }
     return apply;
 }