Fix crash on unit selection

.github/workflows/main_kooktime.yml

@@ -12,6 +12,26 @@ on:
       - main
 
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: "Checkout Github Action"
+        uses: actions/checkout@master
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: "npm"
+          cache-dependency-path: src/CookTime/client-app/package-lock.json
+
+      - name: Install dependencies
+        run: cd src/CookTime/client-app && npm ci
+
+      - name: Lint
+        run: scripts/test --lint
+
   test:
     runs-on: ubuntu-latest
     if: github.event_name == 'pull_request'

CHANGELOG.md

@@ -7,8 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## 2026-02-14
 
+### Fixed
+
+- Fix crash when switching ingredient units caused by reading the event target inside a deferred React state updater
+
 ### Changed
 
+- Add `ESLint` to CI/CD for frontend code
 - More prompt tuning
 
 ## 2026-02-13

scripts/test

@@ -1,6 +1,18 @@
 #!/bin/bash
 set -e
 
+SCRIPT_DIR="$(dirname "$0")"
+REPO_ROOT="$SCRIPT_DIR/.."
+
+# --lint: run frontend linting only, then exit
+if [ "$1" = "--lint" ]; then
+    echo "Running frontend lint..."
+    cd "$REPO_ROOT/src/CookTime/client-app"
+    npx eslint src/
+    echo "Lint passed!"
+    exit 0
+fi
+
 API_URL="${API_BASE_URL:-http://localhost:5001}"
 MAX_WAIT=30
 
@@ -23,6 +35,6 @@ echo "API is healthy!"
 
 echo ""
 echo "Running tests..."
-cd "$(dirname "$0")/../src/CookTimeTests"
+cd "$REPO_ROOT/src/CookTimeTests"
 dotnet build -v minimal
 dotnet test --verbosity normal --no-build --logger "trx;LogFileName=test-results.trx" -- RunConfiguration.DisableParallelization=true

src/CookTime/client-app/eslint.config.js

@@ -0,0 +1,32 @@
+import js from "@eslint/js";
+import tseslint from "typescript-eslint";
+import reactHooks from "eslint-plugin-react-hooks";
+import reactRefresh from "eslint-plugin-react-refresh";
+
+export default tseslint.config(
+    { ignores: ["build/**", "node_modules/**", ".react-router/**"] },
+    js.configs.recommended,
+    ...tseslint.configs.recommended,
+    {
+        plugins: {
+            "react-hooks": reactHooks,
+            "react-refresh": reactRefresh,
+        },
+        rules: {
+            ...reactHooks.configs.recommended.rules,
+            "react-refresh/only-export-components": [
+                "warn",
+                { allowConstantExport: true },
+            ],
+            // Relaxed for existing codebase — tighten over time
+            "@typescript-eslint/no-explicit-any": "warn",
+            "@typescript-eslint/no-unused-vars": [
+                "warn",
+                { argsIgnorePattern: "^_", varsIgnorePattern: "^_" },
+            ],
+            "@typescript-eslint/no-empty-object-type": "warn",
+            "react-hooks/static-components": "warn",
+            "react-hooks/set-state-in-effect": "warn",
+        },
+    }
+);