Make deleting optimistic too.

Author: leerob

components/cart/delete-item-button.tsx

@@ -1,47 +1,35 @@
 'use client';
 
 import { XMarkIcon } from '@heroicons/react/24/outline';
-import clsx from 'clsx';
 import { removeItem } from 'components/cart/actions';
-import LoadingDots from 'components/loading-dots';
 import type { CartItem } from 'lib/shopify/types';
-import { useFormState, useFormStatus } from 'react-dom';
+import { useFormState } from 'react-dom';
 
-function SubmitButton() {
-  const { pending } = useFormStatus();
-
-  return (
-    <button
-      type="submit"
-      onClick={(e: React.FormEvent<HTMLButtonElement>) => {
-        if (pending) e.preventDefault();
-      }}
-      aria-label="Remove cart item"
-      aria-disabled={pending}
-      className={clsx(
-        'ease flex h-[17px] w-[17px] items-center justify-center rounded-full bg-neutral-500 transition-all duration-200',
-        {
-          'cursor-not-allowed px-0': pending
-        }
-      )}
-    >
-      {pending ? (
-        <LoadingDots className="bg-white" />
-      ) : (
-        <XMarkIcon className="hover:text-accent-3 mx-[1px] h-4 w-4 text-white dark:text-black" />
-      )}
-    </button>
-  );
-}
-
-export function DeleteItemButton({ item }: { item: CartItem }) {
+export function DeleteItemButton({
+  item,
+  optimisticUpdate
+}: {
+  item: CartItem;
+  optimisticUpdate: any;
+}) {
   const [message, formAction] = useFormState(removeItem, null);
   const itemId = item.id;
   const actionWithVariant = formAction.bind(null, itemId);
 
   return (
-    <form action={actionWithVariant}>
-      <SubmitButton />
+    <form
+      action={async () => {
+        optimisticUpdate({ itemId, newQuantity: 0, type: 'minus' });
+        await actionWithVariant();
+      }}
+    >
+      <button
+        type="submit"
+        aria-label="Remove cart item"
+        className="ease flex h-[17px] w-[17px] items-center justify-center rounded-full bg-neutral-500 transition-all duration-200"
+      >
+        <XMarkIcon className="hover:text-accent-3 mx-[1px] h-4 w-4 text-white dark:text-black" />
+      </button>
       <p aria-live="polite" className="sr-only" role="status">
         {message}
       </p>

components/cart/modal.tsx

@@ -179,7 +179,7 @@ export default function CartModal({ cart: initialCart }: { cart: Cart | undefine
                         >
                           <div className="relative flex w-full flex-row justify-between px-1 py-4">
                             <div className="absolute z-40 -mt-2 ml-[55px]">
-                              <DeleteItemButton item={item} />
+                              <DeleteItemButton item={item} optimisticUpdate={updateCartItem} />
                             </div>
                             <Link
                               href={merchandiseUrl}