initial provider (#2)

framework/medusa/auth/use-signup.tsx

@@ -0,0 +1,51 @@
+import { useCallback } from 'react'
+import useCustomer from '../customer/use-customer'
+import { MutationHook } from '@commerce/utils/types'
+import useSignup, { UseSignup } from '@commerce/auth/use-signup'
+import { CommerceError } from '@commerce/utils/errors'
+
+export default useSignup as UseSignup<typeof handler>
+
+export const handler: MutationHook<any> = {
+  fetchOptions: {
+    query: 'customers',
+    method: 'create',
+  },
+  async fetcher({
+    input: { firstName, lastName, email, password },
+    options,
+    fetch,
+  }) {
+    if (!(firstName && lastName && email && password)) {
+      throw new CommerceError({
+        message:
+          'A first name, last name, email and password are required to signup',
+      })
+    }
+    return await fetch({
+      ...options,
+      variables: {
+        payload: {
+          first_name: firstName,
+          last_name: lastName,
+          email,
+          password,
+        },
+      },
+    })
+  },
+  useHook:
+    ({ fetch }) =>
+    () => {
+      const { revalidate } = useCustomer()
+
+      return useCallback(
+        async function signup(input) {
+          const data = await fetch({ input })
+          await revalidate()
+          return data
+        },
+        [fetch, revalidate]
+      )
+    },
+}