Upgraded to next v15 and eslint to v9

src/providers/cart.tsx

@@ -5,20 +5,20 @@ import React, { createContext, useContext, useEffect, useState } from 'react';
 
 import { useRegion } from './region';
 
-type CartContextType = {
+interface CartContextType {
   cart?: HttpTypes.StoreCart;
   setCart: React.Dispatch<React.SetStateAction<HttpTypes.StoreCart | undefined>>;
   addToCart: (variant_id: string, quantity: number) => void;
   updateQuantity: (item_id: string, quantity: number) => void;
   removeItem: (item_id: string) => void;
   refreshCart: () => void;
-};
+}
 
 const CartContext = createContext<CartContextType | null>(null);
 
-type CartProviderProps = {
+interface CartProviderProps {
   children: React.ReactNode;
-};
+}
 
 export const CartProvider = ({ children }: CartProviderProps) => {
   const [cart, setCart] = useState<HttpTypes.StoreCart>();
@@ -68,7 +68,7 @@ export const CartProvider = ({ children }: CartProviderProps) => {
     setCart(undefined);
   };
 
-  function addToCart(variant_id: string, quantity: number = 1) {
+  function addToCart(variant_id: string, quantity = 1) {
     if (!cart) {
       return;
     }

src/providers/customer.tsx

@@ -3,18 +3,18 @@
 import { HttpTypes } from '@medusajs/types';
 import React, { createContext, useContext, useEffect, useState } from 'react';
 
-type CustomerContextType = {
+interface CustomerContextType {
   customer: HttpTypes.StoreCustomer | undefined;
   register: (firstName: string, lastName: string, email: string, password: string) => Promise<void>;
   login: (email: string, password: string) => Promise<void>;
   logout: () => void;
-};
+}
 
 const CustomerContext = createContext<CustomerContextType | null>(null);
 
-type CustomerProviderProps = {
+interface CustomerProviderProps {
   children: React.ReactNode;
-};
+}
 
 export const CustomerProvider = ({ children }: CustomerProviderProps) => {
   const [customer, setCustomer] = useState<HttpTypes.StoreCustomer | undefined>();

src/providers/region.tsx

@@ -3,16 +3,16 @@
 import { HttpTypes } from '@medusajs/types';
 import React, { createContext, useContext, useEffect, useState } from 'react';
 
-type RegionContextType = {
+interface RegionContextType {
   region?: HttpTypes.StoreRegion;
   setRegion: React.Dispatch<React.SetStateAction<HttpTypes.StoreRegion | undefined>>;
-};
+}
 
 const RegionContext = createContext<RegionContextType | null>(null);
 
-type RegionProviderProps = {
+interface RegionProviderProps {
   children: React.ReactNode;
-};
+}
 
 export const RegionProvider = ({ children }: RegionProviderProps) => {
   const [region, setRegion] = useState<HttpTypes.StoreRegion>();