Fixes for optimize package (#2270)

Author: dotansimha

.changeset/flat-monkeys-watch.md

@@ -0,0 +1,5 @@
+---
+'graphql-tools': patch
+---
+
+Added export from new optimize package

.changeset/pink-eagles-cheer.md

@@ -0,0 +1,5 @@
+---
+'@graphql-tools/optimize': patch
+---
+
+Fix missing Directive AST when clearing empty nodes

packages/graphql-tools/package.json

@@ -19,6 +19,7 @@
     "directory": "dist"
   },
   "dependencies": {
+    "@graphql-tools/optimize": "1.0.0",
     "@graphql-tools/batch-delegate": "^7.0.0",
     "@graphql-tools/batch-execute": "^7.0.0",
     "@graphql-tools/delegate": "^7.0.1",

packages/graphql-tools/src/index.ts

@@ -20,3 +20,4 @@ export * from '@graphql-tools/schema';
 export * from '@graphql-tools/stitch';
 export * from '@graphql-tools/utils';
 export * from '@graphql-tools/wrap';
+export * from '@graphql-tools/optimize';

packages/optimize/src/optimizers/remove-empty-nodes.ts

@@ -42,5 +42,6 @@ export const removeEmptyNodes: DocumentOptimizer = input => {
     FragmentSpread: transformNode,
     InlineFragment: transformNode,
     Name: transformNode,
+    Directive: transformNode,
   });
 };