Add benchmark

Author: AaronMoat

benchmark/repeated-fields-benchmark.js

@@ -0,0 +1,18 @@
+import { graphqlSync } from 'graphql/graphql.js';
+import { buildSchema } from 'graphql/utilities/buildASTSchema.js';
+
+import { bigSchemaSDL } from './fixtures.js';
+
+const schema = buildSchema(bigSchemaSDL, { assumeValid: true });
+const query = `{ ${'__typename '.repeat(2000)}}`;
+
+export const benchmark = {
+  name: 'Many repeated fields',
+  count: 50,
+  measure() {
+    graphqlSync({
+      schema,
+      source: query,
+    });
+  },
+};