added a solution to the problem

.github/workflows/test.yml-template

@@ -0,0 +1,23 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm install
+    - run: npm test

package.json

@@ -17,7 +17,7 @@
   "license": "GPL-3.0",
   "devDependencies": {
     "@mate-academy/eslint-config": "latest",
-    "@mate-academy/scripts": "^1.8.6",
+    "@mate-academy/scripts": "^2.1.3",
     "eslint": "^8.57.0",
     "eslint-plugin-jest": "^28.6.0",
     "eslint-plugin-node": "^11.1.0",

src/transformStateWithClones.js

@@ -7,7 +7,42 @@
  * @return {Object[]}
  */
 function transformStateWithClones(state, actions) {
-  // write code here
+  const results = [];
+  let curState = state;
+
+  for (const action of actions) {
+    let newState;
+
+    switch (action.type) {
+      case 'addProperties': {
+        newState = { ...curState, ...action.extraData };
+        break;
+      }
+
+      case 'removeProperties': {
+        newState = { ...curState };
+
+        for (const key of action.keysToRemove) {
+          delete newState[key];
+        }
+        break;
+      }
+
+      case 'clear': {
+        newState = {};
+        break;
+      }
+
+      default: {
+        throw new Error(`Unknow action type: ${action.type}`);
+      }
+    }
+
+    results.push(newState);
+    curState = newState;
+  }
+
+  return results;
 }
 
 module.exports = transformStateWithClones;