feat: turbostarter boilerplate

Production-ready Next.js boilerplate with:
- Runtime env validation (fail-fast on missing vars)
- Feature-gated config (S3, Stripe, email, OAuth)
- Docker + Coolify deployment pipeline
- PostgreSQL + pgvector, MinIO S3, Better Auth
- TypeScript strict mode (no ignoreBuildErrors)
- i18n (en/es), AI modules, billing, monitoring

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/ui/web/src/components/form.tsx

@@ -0,0 +1,164 @@
+"use client";
+
+import { Slot } from "@radix-ui/react-slot";
+import * as React from "react";
+import {
+  Controller,
+  FormProvider,
+  useFormContext,
+  useFormState,
+} from "react-hook-form";
+
+import { isKey, useTranslation } from "@turbostarter/i18n";
+import { cn } from "@turbostarter/ui";
+
+import type { Label as LabelPrimitive } from "radix-ui";
+import type { ControllerProps, FieldPath, FieldValues } from "react-hook-form";
+
+import { Label } from "#components/label";
+
+const Form = FormProvider;
+
+interface FormFieldContextValue<
+  TFieldValues extends FieldValues = FieldValues,
+  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>,
+> {
+  name: TName;
+}
+
+const FormFieldContext = React.createContext<FormFieldContextValue>(
+  {} as FormFieldContextValue,
+);
+
+const FormField = <
+  TFieldValues extends FieldValues = FieldValues,
+  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>,
+>({
+  ...props
+}: ControllerProps<TFieldValues, TName>) => {
+  return (
+    <FormFieldContext.Provider value={{ name: props.name }}>
+      <Controller {...props} />
+    </FormFieldContext.Provider>
+  );
+};
+
+const useFormField = () => {
+  const fieldContext = React.useContext(FormFieldContext);
+  const itemContext = React.useContext(FormItemContext);
+  const { getFieldState } = useFormContext();
+  const formState = useFormState({ name: fieldContext.name });
+  const fieldState = getFieldState(fieldContext.name, formState);
+
+  // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+  if (!fieldContext) {
+    throw new Error("useFormField should be used within <FormField>");
+  }
+
+  const { id } = itemContext;
+  return {
+    id,
+    name: fieldContext.name,
+    formItemId: `${id}-form-item`,
+    formDescriptionId: `${id}-form-item-description`,
+    formMessageId: `${id}-form-item-message`,
+    ...fieldState,
+  };
+};
+
+interface FormItemContextValue {
+  id: string;
+}
+
+const FormItemContext = React.createContext<FormItemContextValue>(
+  {} as FormItemContextValue,
+);
+
+function FormItem({ className, ...props }: React.ComponentProps<"div">) {
+  const id = React.useId();
+  return (
+    <FormItemContext.Provider value={{ id }}>
+      <div
+        data-slot="form-item"
+        className={cn("grid gap-2", className)}
+        {...props}
+      />
+    </FormItemContext.Provider>
+  );
+}
+
+function FormLabel({
+  className,
+  ...props
+}: React.ComponentProps<typeof LabelPrimitive.Root>) {
+  const { error, formItemId } = useFormField();
+  return (
+    <Label
+      data-slot="form-label"
+      data-error={!!error}
+      className={cn("data-[error=true]:text-destructive", className)}
+      htmlFor={formItemId}
+      {...props}
+    />
+  );
+}
+
+function FormControl({ ...props }: React.ComponentProps<typeof Slot>) {
+  const { error, formItemId, formDescriptionId, formMessageId } =
+    useFormField();
+  return (
+    <Slot
+      data-slot="form-control"
+      id={formItemId}
+      aria-describedby={
+        !error
+          ? `${formDescriptionId}`
+          : `${formDescriptionId} ${formMessageId}`
+      }
+      aria-invalid={!!error}
+      {...props}
+    />
+  );
+}
+
+function FormDescription({ className, ...props }: React.ComponentProps<"p">) {
+  const { formDescriptionId } = useFormField();
+  return (
+    <p
+      data-slot="form-description"
+      id={formDescriptionId}
+      className={cn("text-muted-foreground text-sm", className)}
+      {...props}
+    />
+  );
+}
+
+function FormMessage({ className, ...props }: React.ComponentProps<"p">) {
+  const { t, i18n } = useTranslation();
+  const { error, formMessageId } = useFormField();
+  const body = error ? String(error.message) : props.children;
+  if (!body) {
+    return null;
+  }
+  return (
+    <p
+      data-slot="form-message"
+      id={formMessageId}
+      className={cn("text-destructive text-sm", className)}
+      {...props}
+    >
+      {typeof body === "string" && isKey(body, i18n) ? t(body) : body}
+    </p>
+  );
+}
+
+export {
+  useFormField,
+  Form,
+  FormItem,
+  FormLabel,
+  FormControl,
+  FormDescription,
+  FormMessage,
+  FormField,
+};