Add optional pre-request hook to Axios fetcher

src/Client.ts

@@ -45,7 +45,7 @@ class Client {
       ...customOptions
     }
 
-    const fetcherOptions: CreateFetcherConfig = { host: options.host }
+    const fetcherOptions: CreateFetcherConfig = { host: options.host, beforeRequestFunction: options?.beforeRequestFunction }
 
     this.fetcher = options.createFetcher(fetcherOptions)
 

src/Http.ts

@@ -69,13 +69,14 @@ export default class Http {
   }
 
   protected processError(error: Error): SpreeSDKError {
-    if (error instanceof FetchError) {
-      if (error.response) {
+    if ((error as FetchError)?.response) {
+      const fetchError = (error as FetchError)
+      if (fetchError.response) {
         // Error from Spree outside HTTP 2xx codes
         return this.processSpreeError(error)
       }
 
-      if (error.request) {
+      if (fetchError.request) {
         // No response received from Spree
         return new NoResponseError()
       }

src/fetchers/createAxiosFetcher.ts

@@ -18,6 +18,9 @@ const createAxiosFetcher: CreateFetcher = (fetcherOptions) => {
     headers: { 'Content-Type': 'application/json' },
     paramsSerializer: (params) => objectToQuerystring(params)
   })
+  if (fetcherOptions.beforeRequestFunction){
+    fetcherOptions?.beforeRequestFunction(axios)
+  }
 
   return {
     fetch: async (fetchOptions) => {

src/fetchers/createFetchFetcher.ts

@@ -8,6 +8,10 @@ const createCustomizedFetchFetcher: CreateCustomizedFetchFetcher = (fetcherOptio
 
   const { host, fetch, requestConstructor } = fetcherOptions
 
+  if (fetcherOptions.beforeRequestFunction){
+    fetcherOptions?.beforeRequestFunction()
+  }
+
   return {
     fetch: async (fetchOptions) => {
       try {

src/interfaces/ClientConfig.ts

@@ -1,4 +1,5 @@
 import type { FetchConfig } from './FetchConfig'
+import { AxiosInstance } from 'axios'
 
 export type Fetcher = {
   fetch: (options: FetchConfig) => Promise<{ data: any }>
@@ -8,10 +9,12 @@ export type CreateFetcher = (options: CreateFetcherConfig) => Fetcher
 
 export type CreateFetcherConfig = {
   host: string
+  beforeRequestFunction?(axios?: AxiosInstance): any
 }
 
 export type FetcherConfig = {
   createFetcher: CreateFetcher
 }
 
+
 export type IClientConfig = CreateFetcherConfig & FetcherConfig