diff --git a/app/sign-up-form.tsx b/app/sign-up-form.tsx
index ca0a5b8..c84f1d8 100644
--- a/app/sign-up-form.tsx
+++ b/app/sign-up-form.tsx
@@ -41,7 +41,7 @@ export default function SignUp() {
     // Double-check signup isn't blocked before submitting
     const currentStatus = isSignupBlocked();
     if (currentStatus.blocked) {
-      setResponse(currentStatus.message || "Sign-ups are currently closed.");
+      setResponse(currentStatus.message ?? "Sign-ups are currently closed.");
       return;
     }
     setSubmitted(true);
diff --git a/components/ui/form.tsx b/components/ui/form.tsx
index 4a32ae2..84e0f21 100644
--- a/components/ui/form.tsx
+++ b/components/ui/form.tsx
@@ -3,26 +3,19 @@
 import * as React from "react";
 import * as LabelPrimitive from "@radix-ui/react-label";
 import { Slot } from "@radix-ui/react-slot";
-import {
-  Controller,
-  ControllerProps,
-  FieldPath,
-  FieldValues,
-  FormProvider,
-  useFormContext,
-} from "react-hook-form";
+import { Controller, ControllerProps, FieldPath, FieldValues, FormProvider, useFormContext } from "react-hook-form";
 
 import { cn } from "@/lib/utils";
 import { Label } from "@/components/ui/label";
 
 const Form = FormProvider;
 
-type FormFieldContextValue<
+interface FormFieldContextValue<
   TFieldValues extends FieldValues = FieldValues,
   TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>
-> = {
+> {
   name: TName;
-};
+}
 
 const FormFieldContext = React.createContext<FormFieldContextValue>({} as FormFieldContextValue);
 
@@ -62,9 +55,9 @@ const useFormField = () => {
   };
 };
 
-type FormItemContextValue = {
+interface FormItemContextValue {
   id: string;
-};
+}
 
 const FormItemContext = React.createContext<FormItemContextValue>({} as FormItemContextValue);
 
@@ -87,83 +80,52 @@ const FormLabel = React.forwardRef<
 >(({ className, ...props }, ref) => {
   const { error, formItemId } = useFormField();
 
-  return (
-    <Label
-      ref={ref}
-      className={cn(error && "text-destructive", className)}
-      htmlFor={formItemId}
-      {...props}
-    />
-  );
+  return <Label ref={ref} className={cn(error && "text-destructive", className)} htmlFor={formItemId} {...props} />;
 });
 FormLabel.displayName = "FormLabel";
 
-const FormControl = React.forwardRef<
-  React.ElementRef<typeof Slot>,
-  React.ComponentPropsWithoutRef<typeof Slot>
->(({ ...props }, ref) => {
-  const { error, formItemId, formDescriptionId, formMessageId } = useFormField();
+const FormControl = React.forwardRef<React.ElementRef<typeof Slot>, React.ComponentPropsWithoutRef<typeof Slot>>(
+  ({ ...props }, ref) => {
+    const { error, formItemId, formDescriptionId, formMessageId } = useFormField();
 
-  return (
-    <Slot
-      ref={ref}
-      id={formItemId}
-      aria-describedby={!error ? `${formDescriptionId}` : `${formDescriptionId} ${formMessageId}`}
-      aria-invalid={!!error}
-      {...props}
-    />
-  );
-});
+    return (
+      <Slot
+        ref={ref}
+        id={formItemId}
+        aria-describedby={!error ? formDescriptionId : `${formDescriptionId} ${formMessageId}`}
+        aria-invalid={!!error}
+        {...props}
+      />
+    );
+  }
+);
 FormControl.displayName = "FormControl";
 
-const FormDescription = React.forwardRef<
-  HTMLParagraphElement,
-  React.HTMLAttributes<HTMLParagraphElement>
->(({ className, ...props }, ref) => {
-  const { formDescriptionId } = useFormField();
+const FormDescription = React.forwardRef<HTMLParagraphElement, React.HTMLAttributes<HTMLParagraphElement>>(
+  ({ className, ...props }, ref) => {
+    const { formDescriptionId } = useFormField();
 
-  return (
-    <p
-      ref={ref}
-      id={formDescriptionId}
-      className={cn("text-sm text-muted-foreground", className)}
-      {...props}
-    />
-  );
-});
+    return <p ref={ref} id={formDescriptionId} className={cn("text-sm text-muted-foreground", className)} {...props} />;
+  }
+);
 FormDescription.displayName = "FormDescription";
 
-const FormMessage = React.forwardRef<
-  HTMLParagraphElement,
-  React.HTMLAttributes<HTMLParagraphElement>
->(({ className, children, ...props }, ref) => {
-  const { error, formMessageId } = useFormField();
-  const body = error ? String(error?.message) : children;
+const FormMessage = React.forwardRef<HTMLParagraphElement, React.HTMLAttributes<HTMLParagraphElement>>(
+  ({ className, children, ...props }, ref) => {
+    const { error, formMessageId } = useFormField();
+    const body = error ? String(error?.message) : children;
 
-  if (!body) {
-    return null;
+    if (!body) {
+      return null;
+    }
+
+    return (
+      <p ref={ref} id={formMessageId} className={cn("text-sm font-medium text-destructive", className)} {...props}>
+        {body}
+      </p>
+    );
   }
-
-  return (
-    <p
-      ref={ref}
-      id={formMessageId}
-      className={cn("text-sm font-medium text-destructive", className)}
-      {...props}
-    >
-      {body}
-    </p>
-  );
-});
+);
 FormMessage.displayName = "FormMessage";
 
-export {
-  useFormField,
-  Form,
-  FormItem,
-  FormLabel,
-  FormControl,
-  FormDescription,
-  FormMessage,
-  FormField,
-};
+export { useFormField, Form, FormItem, FormLabel, FormControl, FormDescription, FormMessage, FormField };
diff --git a/lib/listmonk.ts b/lib/listmonk.ts
index 85f54ea..1aeef39 100644
--- a/lib/listmonk.ts
+++ b/lib/listmonk.ts
@@ -1,12 +1,12 @@
 import "server-only";
 
-export type listmonkData = {
+export interface listmonkData {
   email: string;
   name: string;
   status: "enabled" | "blocklisted";
   lists: number[];
   attribs: Record<string, string>;
-};
+}
 
 async function listmonk(data: listmonkData): Promise<string> {
   const listmonkUrl = process.env.LISTMONK_URL ?? "http://localhost:9000/api/";
diff --git a/lib/signup-time-check.ts b/lib/signup-time-check.ts
index 2b6727f..5726d0b 100644
--- a/lib/signup-time-check.ts
+++ b/lib/signup-time-check.ts
@@ -1,7 +1,7 @@
 import eventConfig from "@/event-dates.json";
 
 export function isSignupBlocked(currentTime?: Date): { blocked: boolean; message?: string } {
-  const now = currentTime || new Date();
+  const now = currentTime ?? new Date();
   const cutoffTime = eventConfig.cutoffTime || "15:00";
   const blockDurationHours = eventConfig.blockDurationHours || 6;