fix: textarea() returns null when empty

.changeset/thin-chairs-stare.md

@@ -0,0 +1,5 @@
+---
+"formgator": patch
+---
+
+Empty `textarea()` properly returns `null`

src/validators/textarea.ts

@@ -9,20 +9,31 @@ import { type FormInput, failures, methods, succeed } from "../definitions.js";
  * - `maxlength` - Maximum length of the input.
  * - `minlength` - Minimum length of the input.
  */
+export function textarea(attributes?: {
+  required?: false;
+  maxlength?: number;
+  minlength?: number;
+}): FormInput<string | null> & { trim: () => FormInput<string> };
+export function textarea(attributes: {
+  required: true;
+  maxlength?: number;
+  minlength?: number;
+}): FormInput<string> & { trim: () => FormInput<string> };
 export function textarea(
   attributes: {
     required?: boolean;
     maxlength?: number;
     minlength?: number;
   } = {},
-): FormInput<string> & { trim: () => FormInput<string> } {
+): FormInput<string | null> & { trim: () => FormInput<string> } {
   return {
     ...methods,
     attributes,
     safeParse: (data, name) => {
       const value = data.get(name);
       if (typeof value !== "string") return failures.type();
-      if (attributes.required && value === "") return failures.required();
+      if (value === "")
+        return attributes.required ? failures.required() : succeed(null);
       if (attributes.maxlength && value.length > attributes.maxlength)
         return failures.maxlength(attributes.maxlength);
       if (attributes.minlength && value.length < attributes.minlength)
@@ -31,7 +42,7 @@ export function textarea(
     },
     /** Removes the leading and trailing white space from the value. */
     trim() {
-      return this.transform((value) => value.trim());
+      return this.transform((value) => (value ?? "").trim());
     },
   };
 }