Types

types/helpers/helpers.options.d.ts

@@ -52,3 +52,10 @@ export function resolve<T, C>(
 	index?: number,
 	info?: { cacheable?: boolean }
 ): T | undefined;
+
+
+/**
+ * Create a context inheriting parentContext
+ * @since 3.6.0
+ */
+export function createContext<P, T>(parentContext: P, context: T): P extends null ? T : P & T;

types/tests/helpers/options.ts

@@ -0,0 +1,10 @@
+import { createContext } from '../../helpers/helpers.options';
+
+const context1 = createContext(null, { type: 'test1', parent: true });
+const context2 = createContext(context1, { type: 'test2' });
+
+const sSest: string = context1.type + context2.type;
+const bTest: boolean = context1.parent && context2.parent;
+
+// @ts-expect-error Property 'notThere' does not exist on type '{ type: string; parent: boolean; } & { type: string; }'
+context2.notThere = '';