fix(lib): correctness bugs, dead import + lightweight tooling

.editorconfig

@@ -0,0 +1,13 @@
+# https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false

.github/workflows/test.yml

@@ -0,0 +1,16 @@
+name: test
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+      - run: npm test

.nvmrc

@@ -0,0 +1 @@
+22

lib/errors.js

@@ -35,8 +35,8 @@ const isNotThrowingErrors = function (testFuncs) {
 const isNotImplementedError = (err) => err instanceof NotImplementedError;
 
 class NotImplementedError extends Error {
-  constructor() {
-    super('Not implemented');
+  constructor(message = 'Not implemented') {
+    super(message);
   }
 }
 

lib/optional-test-extension.js

@@ -4,18 +4,16 @@ const { isNotImplementedError } = require('./errors.js');
 function optionalTestExtension(title, cb, isAsyncTest) {
   test(title, (t) => {
     if (isAsyncTest) {
-      runAsyncTestCb(cb, t, title);
-    } else {
-      runSyncTestCb(cb, t, title);
+      return runAsyncTestCb(cb, t, title);
     }
+    return runSyncTestCb(cb, t, title);
   });
 }
 
-const runAsyncTestCb = (cb, t, title) => {
+const runAsyncTestCb = (cb, t, title) =>
   cb.call(t).catch((err) => {
     handleTestError(t, title, err);
   });
-};
 
 const runSyncTestCb = (cb, t, title) => {
   try {

package.json

@@ -2,7 +2,6 @@
   "name": "basic-js",
   "version": "1.0.0",
   "description": "Tasks for mastering basics of JavaScript",
-  "main": "index.js",
   "engines": {
     "node": ">=22",
     "npm": ">=10"

src/simple-chain.js

@@ -1,4 +1,3 @@
-const { decorateObject } = require('../lib');
 const { NotImplementedError } = require('../lib');
 
 /**