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src/lib/fragment.ts

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+import { gql } from "apollo-server-micro";
+import { DocumentNode } from "graphql";
+
+type FragmentDefinition<T> = {
+  query:DocumentNode;
+  name:string;
+  needsInclude:boolean;
+}
+
+export const createFragment = <T>(params:{
+  query:DocumentNode;
+  name:string;
+  needsInclude?:boolean;
+}):FragmentDefinition<T> => {
+  return {
+    ...params,
+    needsInclude: typeof params.needsInclude === 'undefined' ? true : params.needsInclude
+  }
+}
+
+export const includeFragment = <T>(fragment:FragmentDefinition<T>) => {
+  if(!fragment.needsInclude) return '';
+  return fragment.query;
+}
+
+export const extendFragment = <T>(fragment:FragmentDefinition<T>) => {
+  if(!fragment.needsInclude) return fragment.query;
+  return `...${fragment.name}`;
+}