Done store task :) sorry for being late..

.hintrc

@@ -0,0 +1,8 @@
+{
+  "extends": [
+    "development"
+  ],
+  "hints": {
+    "typescript-config/is-valid": "off"
+  }
+}

store.ts

@@ -72,50 +72,55 @@ const store: Store = {
 // Shopping cart: array of product IDs
 // ------------------------------------
 
-const cart = [1, 3, 5];
+const cart : number[] = [1, 3, 5];
 
 // ------------------------------------
 // Functions to implement
 // ------------------------------------
 
 function getAvailableProducts(
-  store /* : add type here */
-) /* : add return types */ {
-  return [];
+  store : Store
+) : Product[] {
+  return store.products.filter(product => product.inStock);
 }
 
 function getProductsInPriceRange(
-  store /* : add type here */,
-  minPrice /* : add type here */,
-  maxPrice /* : add type here */
-) /* : add return types */ {
-  return [];
+  store : Store,
+  minPrice : number,
+  maxPrice : number
+) : Product[] {
+  return store.products.filter(product => product.price > minPrice && product.price < maxPrice);
 }
 
 function getProductsByTag(
-  store /* : add type here */,
-  tag /* : add type here */
-) /* : add return types */ {
-  return [];
+  store : Store,
+  tag : string
+) : Product[] {
+  return store.products.filter(product => product.tags.includes(tag));
 }
 
 function getAvailableProductsByTag(
-  store /* : add type here */,
-  tag /* : add type here */
-) /* : add return types */ {
-  return [];
+  store : Store,
+  tag : string
+) : Product[] {
+  return getProductsByTag(store, tag).filter(product => product.inStock);
 }
 
 function getCartProducts(
-  store /* : add type here */,
-  cart /* : add type here */
-) /* : add return types */ {
-  return [];
+  store : Store,
+  cart : number[]
+) : Product[] {
+  return store.products.filter(product => cart.includes(product.id));
 }
 
 function getCartTotalInStock(
-  store /* : add type here */,
-  cart /* : add type here */
-) /* : add return types */ {
-  return 0;
+  store : Store,
+  cart : number[]
+) : number {
+  //function is not really defined, I understand it as return how much products from the cart are available
+  return store.products.filter(product => cart.includes(product.id) && product.inStock).length;
 }
+
+
+
+// note: I'm not familiar with compiling TS. I understand, using Gemini, that the errors I got are due to version differences etc. Please let me know if I miss something here 🙏

tsconfig.json

@@ -0,0 +1,44 @@
+{
+  // Visit https://aka.ms/tsconfig to read more about this file
+  "compilerOptions": {
+    // File Layout
+    // "rootDir": "./src",
+    // "outDir": "./dist",
+
+    // Environment Settings
+    // See also https://aka.ms/tsconfig/module
+    "module": "nodenext",
+    "target": "esnext",
+    "types": [],
+    // For nodejs:
+    // "lib": ["esnext"],
+    // "types": ["node"],
+    // and npm install -D @types/node
+
+    // Other Outputs
+    "sourceMap": true,
+    "declaration": true,
+    "declarationMap": true,
+
+    // Stricter Typechecking Options
+    "noUncheckedIndexedAccess": true,
+    "exactOptionalPropertyTypes": true,
+
+    // Style Options
+    // "noImplicitReturns": true,
+    // "noImplicitOverride": true,
+    // "noUnusedLocals": true,
+    // "noUnusedParameters": true,
+    // "noFallthroughCasesInSwitch": true,
+    // "noPropertyAccessFromIndexSignature": true,
+
+    // Recommended Options
+    "strict": true,
+    "jsx": "react-jsx",
+    "verbatimModuleSyntax": true,
+    "isolatedModules": true,
+    "noUncheckedSideEffectImports": true,
+    "moduleDetection": "force",
+    "skipLibCheck": true,
+  }
+}