Add more options to the hook handler

framework/bigcommerce/provider.tsx

@@ -1,3 +1,4 @@
+import { useMemo } from 'react'
 import { FetcherError } from '@commerce/utils/errors'
 import type { Fetcher, HookHandler } from '@commerce/utils/types'
 import type { FetchCartInput } from '@commerce/cart/use-cart'
@@ -57,6 +58,22 @@ const useCart: HookHandler<
     revalidateOnFocus: false,
   },
   normalizer: normalizeCart,
+  useHook({ input, useData }) {
+    const response = useData({ input })
+
+    return useMemo(
+      () =>
+        Object.create(response, {
+          isEmpty: {
+            get() {
+              return (response.data?.lineItems.length ?? 0) <= 0
+            },
+            enumerable: true,
+          },
+        }),
+      [response]
+    )
+  },
   onResponse(response) {
     return Object.create(response, {
       isEmpty: {

framework/commerce/cart/use-cart.tsx

@@ -1,23 +1,24 @@
 import { useMemo } from 'react'
 import Cookies from 'js-cookie'
-import type { HookFetcherFn } from '../utils/types'
-import useData from '../utils/use-data-2'
 import type { Cart } from '../types'
+import type { Prop, HookFetcherFn, UseHookInput } from '../utils/types'
+import useData from '../utils/use-data-2'
 import { Provider, useCommerce } from '..'
 
 export type FetchCartInput = {
   cartId?: Cart['id']
 }
 
-export type CartResponse<P extends Provider> = ReturnType<
-  NonNullable<NonNullable<NonNullable<P['cart']>['useCart']>['onResponse']>
+export type UseCartHandler<P extends Provider> = Prop<
+  Prop<P, 'cart'>,
+  'useCart'
 >
 
-export type UseCartInput<P extends Provider> = Parameters<
-  NonNullable<
-    NonNullable<NonNullable<NonNullable<P['cart']>['useCart']>>['input']
-  >
->[0]
+export type CartResponse<P extends Provider> = ReturnType<
+  Prop<UseCartHandler<P>, 'onResponse'>
+>
+
+export type UseCartInput<P extends Provider> = UseHookInput<UseCartHandler<P>>
 
 export type UseCart<P extends Provider> = Partial<
   UseCartInput<P>
@@ -35,25 +36,59 @@ export const fetcher: HookFetcherFn<Cart | null, FetchCartInput> = async ({
   return data && normalize ? normalize(data) : data
 }
 
-export default function useCart<P extends Provider>(input?: UseCartInput<P>) {
+type X = UseCartInput<Provider>
+
+export default function useCart<P extends Provider>(
+  input: UseCartInput<P> = {}
+) {
   const { providerRef, fetcherRef, cartCookie } = useCommerce<P>()
 
   const provider = providerRef.current
   const opts = provider.cart?.useCart
-  const fetcherFn = opts?.fetcher ?? fetcher
-  const wrapper: typeof fetcher = (context) => {
-    context.input.cartId = Cookies.get(cartCookie)
-    return fetcherFn(context)
-  }
-  const response = useData(
-    { ...opts, fetcher: wrapper },
-    opts?.input ? opts.input(input ?? {}) : [],
-    provider.fetcher ?? fetcherRef.current
-  )
-  const memoizedResponse = useMemo(
-    () => (opts?.onResponse ? opts.onResponse(response) : response),
-    [response]
-  )
 
-  return memoizedResponse as CartResponse<P>
+  const { swrOptions, ...hookInput } = input
+
+  return opts?.useHook!({
+    input: hookInput,
+    swrOptions,
+    useData(ctx) {
+      const fetcherFn = opts?.fetcher ?? fetcher
+      const wrapper: typeof fetcher = (context) => {
+        context.input.cartId = Cookies.get(cartCookie)
+        return fetcherFn(context)
+      }
+      const response = useData(
+        {
+          ...opts,
+          fetcher: wrapper,
+          swrOptions: {
+            ...opts.swrOptions,
+            ...(ctx?.swrOptions ?? swrOptions),
+          },
+        },
+        ctx?.input ?? [],
+        provider.fetcher ?? fetcherRef.current
+      )
+      return response
+    },
+  })
+
+  // console.log(i)
+
+  // const fetcherFn = opts?.fetcher ?? fetcher
+  // const wrapper: typeof fetcher = (context) => {
+  //   context.input.cartId = Cookies.get(cartCookie)
+  //   return fetcherFn(context)
+  // }
+  // const response = useData(
+  //   { ...opts, fetcher: wrapper },
+  //   opts?.input ? opts.input(input ?? {}) : [],
+  //   provider.fetcher ?? fetcherRef.current
+  // )
+  // const memoizedResponse = useMemo(
+  //   () => (opts?.onResponse ? opts.onResponse(response) : response),
+  //   [response]
+  // )
+
+  // return memoizedResponse as CartResponse<P>
 }

framework/commerce/utils/types.ts

@@ -74,9 +74,16 @@ export type HookHandler<
   input?(
     input: Input & { swrOptions?: SwrOptions<Data, FetchInput, Result> }
   ): HookFetchInput | HookSwrInput
+  useHook?(context: {
+    input: Input
+    swrOptions?: SwrOptions<Data, FetchInput, Result>
+    useData(context?: {
+      input?: HookFetchInput | HookSwrInput
+      swrOptions?: SwrOptions<Data, FetchInput, Result>
+    }): ResponseState<Data>
+  }): ResponseState<Data> & State
   swrOptions?: SwrOptions<Data, FetchInput, Result>
   onResponse?(response: ResponseState<Data>): ResponseState<Data> & State
-  onMutation?: any
   fetchOptions?: HookFetcherOptions
   fetcher?: HookFetcherFn<Data, FetchInput, Result, Body>
   normalizer?(data: Result): Data
@@ -87,3 +94,18 @@ export type SwrOptions<Data, Input = null, Result = any> = ConfigInterface<
   CommerceError,
   HookFetcher<Data, Input, Result>
 >
+
+/**
+ * Returns the property K from type T excluding nullables
+ */
+export type Prop<T, K extends keyof T> = NonNullable<T[K]>
+
+export type UseHookParameters<H extends HookHandler<any>> = Parameters<
+  Prop<H, 'useHook'>
+>
+
+export type UseHookInput<
+  H extends HookHandler<any>
+> = UseHookParameters<H>[0]['input'] & {
+  swrOptions?: UseHookParameters<H>[0]['swrOptions']
+}