Export format function token

#68

Co-authored-by: Dmitry Manannikov <[email protected]>

README.md

@@ -13,6 +13,7 @@ This plugin connects GraphQL schema to your Fusion.js server, allowing you to ho
 - [API](#api)
   - [Registration API](#registration-api)
     - [`ApolloServerEndpointToken`](#apolloserverendpointtoken)
+    - [`ApolloServerFormatFunctionToken`](#apolloserverformatfunctiontoken)
 
 ---
 
@@ -57,6 +58,14 @@ import {ApolloServerEndpointToken} from 'fusion-plugin-apollo-server';
 
 This should be registered to a string representing the desired GraphQL endpoint. If using [fusion-apollo-universal-client](https://github.com/fusionjs/fusion-apollo-universal-client), this will likely be the same value as `ApolloClientEndpointToken.
 
+##### ApolloServerFormatFunctionToken
+
+```js
+import {ApolloServerFormatFunctionToken} from 'fusion-plugin-apollo-server';
+```
+
+Register function to format errors from resolvers. Could be used for logging.
+
 ##### ApolloContextToken
 
 This can be used to transform the koa context into an apollo context.

src/index.js

@@ -3,7 +3,10 @@ import serverPlugin from './server';
 import type {DepsType, PluginServiceType} from './types';
 import type {FusionPlugin} from 'fusion-core';
 
-export {ApolloServerEndpointToken} from './tokens';
+export {
+  ApolloServerEndpointToken,
+  ApolloServerFormatFunctionToken,
+} from './tokens';
 
 const plugin = __NODE__ ? serverPlugin : null;
 export default ((plugin: any): FusionPlugin<DepsType, PluginServiceType>);