nextjs upgrade

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [eslint-plugin-react-hooks](https://react.dev/) ([source](https://github.com/facebook/react/tree/HEAD/packages/eslint-plugin-react-hooks)) | devDependencies | pin | [`^5.2.0` -> `5.2.0`](https://renovatebot.com/diffs/npm/eslint-plugin-react-hooks/5.2.0/5.2.0) |
| [pnpm/action-setup](https://github.com/pnpm/action-setup) | action | pinDigest |  -> `a7487c7` |

Add the preset `:preserveSemverRanges` to your config if you don't want to pin your dependencies.

---

### Configuration

📅 **Schedule**: Branch creation - "every weekend" (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](https://github.com/renovatebot/renovate/discussions) if that's undesired.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4zMS4xIiwidXBkYXRlZEluVmVyIjoiNDEuMzEuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Reviewed-on: #7
Co-authored-by: Renovate Bot <renovatebot@schulze.network>
Co-committed-by: Renovate Bot <renovatebot@schulze.network>

.gitea/workflows/check.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
   push:
     branches:
-      - '**' # matches every branch
+      - "**" # matches every branch
 
 jobs:
   lint_and_typecheck:
@@ -15,14 +15,17 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
+      - name: Install pnpm
+        uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda # v4
+
       - name: Setup Node.js
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: 22
-          cache: 'npm'
+          cache: "pnpm"
 
       - name: Install dependencies
-        run: npm ci
+        run: pnpm install
 
       - name: Run check
-        run: npm run check
+        run: pnpm run check

README.md

@@ -29,7 +29,6 @@ The project’s code is structured using React/Next.js with TypeScript, focusing
 The calculator models your FIRE journey in two phases:
 
 1. **Accumulation:**
-
    - Your starting capital is grown by your expected CAGR (~7% by default).
    - Monthly savings are added for each year until retirement.
    - Every variable can be adjusted live (capital, savings, age, growth, inflation, spending, target retirement).
@@ -58,11 +57,11 @@ To run locally:
    ```
 2. **Install dependencies**
    ```bash
-   npm install
+   pnpm install
    ```
 3. **Run the app**
    ```bash
-   npm run dev
+   pnpm run dev
    ```
 4. Visit [http://localhost:3000](http://localhost:3000) and unleash the fire.
 

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "build": "next build",
     "check": "next lint && tsc --noEmit",
-    "dev": "next dev --turbo",
+    "dev": "next dev --turbopack",
     "format:check": "prettier --check \"**/*.{ts,tsx,js,jsx,mdx}\" --cache",
     "format:write": "prettier --write \"**/*.{ts,tsx,js,jsx,mdx}\" --cache",
     "lint:fix": "next lint --fix",
@@ -24,14 +24,14 @@
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "lucide-react": "^0.525.0",
-    "next": "^15.2.3",
+    "next": "^15.4.1",
     "next-plausible": "^3.12.4",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "react-hook-form": "^7.56.1",
     "recharts": "^2.15.3",
     "tailwind-merge": "^3.2.0",
-    "zod": "^3.24.3"
+    "zod": "^4.0.0"
   },
   "devDependencies": {
     "@eslint/eslintrc": "3.3.1",
@@ -40,7 +40,8 @@
     "@types/react": "19.1.8",
     "@types/react-dom": "19.1.6",
     "eslint": "9.31.0",
-    "eslint-config-next": "15.3.5",
+    "eslint-config-next": "15.4.1",
+    "eslint-plugin-react-hooks": "5.2.0",
     "postcss": "8.5.6",
     "prettier": "3.6.2",
     "prettier-plugin-tailwindcss": "0.6.14",
@@ -52,5 +53,5 @@
   "ct3aMetadata": {
     "initVersion": "7.39.3"
   },
-  "packageManager": "npm@11.4.2"
+  "packageManager": "pnpm@10.13.1"
 }

pnpm-workspace.yaml

@@ -0,0 +1,6 @@
+ignoredBuiltDependencies:
+  - unrs-resolver
+
+onlyBuiltDependencies:
+  - '@tailwindcss/oxide'
+  - sharp

src/app/components/FireCalculatorForm.tsx

@@ -120,7 +120,7 @@ export default function FireCalculatorForm() {
   const [showing4percent, setShowing4percent] = useState(false);
 
   // Initialize form with default values
-  const form = useForm<FormValues>({
+  const form = useForm<z.input<typeof formSchema>, undefined, FormValues>({
     resolver: zodResolver(formSchema),
     defaultValues: {
       startingCapital: 50000,
@@ -258,11 +258,18 @@ export default function FireCalculatorForm() {
                         <Input
                           placeholder="e.g., 10000"
                           type="number"
-                          {...field}
+                          value={field.value as number | string | undefined}
-                          onChange={(value) => {
+                          onChange={(e) => {
-                            field.onChange(value);
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
                             void form.handleSubmit(onSubmit)();
                           }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -279,11 +286,18 @@ export default function FireCalculatorForm() {
                         <Input
                           placeholder="e.g., 500"
                           type="number"
-                          {...field}
+                          value={field.value as number | string | undefined}
-                          onChange={(value) => {
+                          onChange={(e) => {
-                            field.onChange(value);
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
                             void form.handleSubmit(onSubmit)();
                           }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -300,11 +314,18 @@ export default function FireCalculatorForm() {
                         <Input
                           placeholder="e.g., 30"
                           type="number"
-                          {...field}
+                          value={field.value as number | string | undefined}
-                          onChange={(value) => {
+                          onChange={(e) => {
-                            field.onChange(value);
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
                             void form.handleSubmit(onSubmit)();
                           }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -321,11 +342,18 @@ export default function FireCalculatorForm() {
                         <Input
                           placeholder="e.g., 90"
                           type="number"
-                          {...field}
+                          value={field.value as number | string | undefined}
-                          onChange={(value) => {
+                          onChange={(e) => {
-                            field.onChange(value);
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
                             void form.handleSubmit(onSubmit)();
                           }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -343,11 +371,18 @@ export default function FireCalculatorForm() {
                           placeholder="e.g., 7"
                           type="number"
                           step="0.1"
-                          {...field}
+                          value={field.value as number | string | undefined}
-                          onChange={(value) => {
+                          onChange={(e) => {
-                            field.onChange(value);
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
                             void form.handleSubmit(onSubmit)();
                           }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -365,11 +400,18 @@ export default function FireCalculatorForm() {
                           placeholder="e.g., 2"
                           type="number"
                           step="0.1"
-                          {...field}
+                          value={field.value as number | string | undefined}
-                          onChange={(value) => {
+                          onChange={(e) => {
-                            field.onChange(value);
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
                             void form.handleSubmit(onSubmit)();
                           }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -388,11 +430,18 @@ export default function FireCalculatorForm() {
                         <Input
                           placeholder="e.g., 2000"
                           type="number"
-                          {...field}
+                          value={field.value as number | string | undefined}
-                          onChange={(value) => {
+                          onChange={(e) => {
-                            field.onChange(value);
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
                             void form.handleSubmit(onSubmit)();
                           }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -406,11 +455,13 @@ export default function FireCalculatorForm() {
                   name="retirementAge"
                   render={({ field }) => (
                     <FormItem>
-                      <FormLabel>Retirement Age: {field.value}</FormLabel>
+                      <FormLabel>
+                        Retirement Age: {field.value as number}
+                      </FormLabel>
                       <FormControl>
                         <Slider
                           name="retirementAge"
-                          value={[field.value]}
+                          value={[field.value as number]}
                           min={25}
                           max={75}
                           step={1}
@@ -563,8 +614,8 @@ export default function FireCalculatorForm() {
                         <ReferenceLine
                           x={
                             irlYear +
-                            (form.getValues("retirementAge") -
+                            (Number(form.getValues("retirementAge")) -
-                              form.getValues("currentAge"))
+                              Number(form.getValues("currentAge")))
                           }
                           stroke="var(--primary)"
                           strokeWidth={2}
@@ -579,7 +630,7 @@ export default function FireCalculatorForm() {
                             x={
                               irlYear +
                               (result.retirementAge4percent -
-                                form.getValues("currentAge"))
+                                Number(form.getValues("currentAge")))
                             }
                             stroke="var(--secondary)"
                             strokeWidth={1}
@@ -642,8 +693,8 @@ export default function FireCalculatorForm() {
                 </CardHeader>
                 <CardContent>
                   <p className="text-3xl font-bold">
-                    {form.getValues("lifeExpectancy") -
+                    {Number(form.getValues("lifeExpectancy")) -
-                      form.getValues("retirementAge")}
+                      Number(form.getValues("retirementAge"))}
                   </p>
                 </CardContent>
               </Card>
@@ -674,7 +725,7 @@ export default function FireCalculatorForm() {
                     </CardHeader>
                     <CardContent>
                       <p className="text-3xl font-bold">
-                        {form.getValues("lifeExpectancy") -
+                        {Number(form.getValues("lifeExpectancy")) -
                           (result.retirementAge4percent ?? 0)}
                       </p>
                     </CardContent>