Improve internal typings (#363)

Author: IvanGoncharov

src/node/node.js

@@ -45,7 +45,7 @@ export function nodeDefinitions<TContext>(
     resolveType: typeResolver,
   });
 
-  const nodeField = {
+  const nodeField: GraphQLFieldConfig<mixed, TContext> = {
     description: 'Fetches an object given its ID',
     type: nodeInterface,
     args: {
@@ -57,7 +57,7 @@ export function nodeDefinitions<TContext>(
     resolve: (_obj, { id }, context, info) => fetchById(id, context, info),
   };
 
-  const nodesField = {
+  const nodesField: GraphQLFieldConfig<mixed, TContext> = {
     description: 'Fetches objects given their IDs',
     type: new GraphQLNonNull(new GraphQLList(nodeInterface)),
     args: {
@@ -69,7 +69,7 @@ export function nodeDefinitions<TContext>(
       },
     },
     resolve: (_obj, { ids }, context, info) =>
-      ids.map((id) => fetchById(id, context, info)),
+      ids.map((id: string) => fetchById(id, context, info)),
   };
 
   return { nodeInterface, nodeField, nodesField };

src/node/plural.js

@@ -36,7 +36,7 @@ export function pluralIdentifyingRootField(
     },
     resolve(_obj, args, context, info) {
       const inputs = args[config.argName];
-      return inputs.map((input) =>
+      return inputs.map((input: mixed) =>
         config.resolveSingleInput(input, context, info),
       );
     },