feat: add preAuthLinks option, closes #86 (#243)

Author: matrunchyk

docs/guide/configuration.md

@@ -26,6 +26,9 @@ createApolloClient({
   // Custom starting link.
   // If you want to replace the default HttpLink, set `defaultHttpLink` to false
   link: null,
+  // Custom pre-auth links
+  // Useful if you want, for example, to set a custom middleware for refreshing an access token.
+  preAuthLinks: [],
   // If true, add the default HttpLink.
   // Disable it if you want to replace it with a terminating link using `link` option.
   defaultHttpLink: true,

graphql-client/src/index.js

@@ -29,6 +29,9 @@ export function createApolloClient ({
   // Custom starting link.
   // If you want to replace the default HttpLink, set `defaultHttpLink` to false
   link = null,
+  // Custom pre-auth links
+  // Useful if you want, for example, to set a custom middleware for refreshing an access token.
+  preAuthLinks = [],
   // If true, add the default HttpLink.
   // Disable it if you want to replace it with a terminating link using `link` option.
   defaultHttpLink = true,
@@ -85,6 +88,10 @@ export function createApolloClient ({
 
     // Concat all the http link parts
     link = authLink.concat(link)
+
+    if (preAuthLinks.length) {
+      link = from(preAuthLinks).concat(authLink)
+    }
   }
 
   // On the server, we don't want WebSockets and Upload links