Add getNodeIdFromTypeAndIdentifiers(nodeId) to build

packages/graphile-build/src/plugins/NodePlugin.js

@@ -12,6 +12,7 @@ import type { GraphQLType, GraphQLInterfaceType } from "graphql";
 import type { BuildExtensionQuery } from "./QueryPlugin";
 
 const base64 = str => new Buffer(String(str)).toString("base64");
+const base64Decode = str => new Buffer(String(str), "base64").toString("utf8");
 
 export type NodeFetcher = (
   data: mixed,
@@ -30,6 +31,12 @@ export type BuildExtensionNode = {|
     Type: GraphQLType,
     ...identifiers: Array<mixed>
   ): string,
+  getTypeAndIdentifiersFromNodeId(
+    nodeId: string
+  ): {
+    Type: GraphQLType,
+    identifiers: Array<mixed>,
+  },
   addNodeFetcherForTypeName(typeName: string, fetcher: NodeFetcher): void,
   getNodeAlias(typeName: string): string,
   getNodeType(alias: string): GraphQLType,
@@ -60,6 +67,13 @@ export default (function NodePlugin(
               JSON.stringify([this.getNodeAlias(Type), ...identifiers])
             );
           },
+          getTypeAndIdentifiersFromNodeId(nodeId) {
+            const [alias, ...identifiers] = JSON.parse(base64Decode(nodeId));
+            return {
+              Type: this.getTypeByName(nodeTypeNameByAlias[alias] || alias),
+              identifiers,
+            };
+          },
           addNodeFetcherForTypeName(typeName, fetcher) {
             if (nodeFetcherByTypeName[typeName]) {
               throw new Error("There's already a fetcher for this type");

packages/graphile-build/src/resolveNode.js

@@ -1,5 +1,3 @@
-const base64Decode = str => new Buffer(String(str), "base64").toString("utf8");
-
 export default async function resolveNode(
   nodeId,
   build,
@@ -13,15 +11,14 @@ export default async function resolveNode(
     $$nodeType,
     parseResolveInfo,
     nodeFetcherByTypeName,
-    getNodeType,
+    getTypeAndIdentifiersFromNodeId,
     graphql: { getNamedType },
   } = build;
   if (nodeId === "query") {
     return $$isQuery;
   }
   try {
-    const [alias, ...identifiers] = JSON.parse(base64Decode(nodeId));
-    const Type = getNodeType(alias);
+    const { Type, identifiers } = getTypeAndIdentifiersFromNodeId(nodeId);
     if (!Type) {
       throw new Error("Type not found");
     }