Export options interface along with module definition

types/resolve-pkg/index.d.ts

@@ -1,14 +1,15 @@
 // Type definitions for resolve-pkg 1.0
 // Project: https://github.com/sindresorhus/resolve-pkg
 // Definitions by: Meno Abels <https://github.com/mabels>
+//                 BendingBender <https://github.com/BendingBender>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 2.9
 
-interface ResolvePkgOptions {
-  cwd?: boolean;
+export = resolvePkg;
+
+declare function resolvePkg(moduleId: string, options?: resolvePkg.Options): string;
+
+declare namespace resolvePkg {
+    interface Options {
+        cwd?: boolean;
+    }
 }
-
-type ResolveFunction = (moduleId: string, options?: ResolvePkgOptions) => string;
-declare const resolveFunction: ResolveFunction;
-
-export = resolveFunction;

types/resolve-pkg/resolve-pkg-tests.ts

@@ -1,5 +1,9 @@
 import rpkg = require('resolve-pkg');
+import resolvePkg = require('resolve-pkg');
 
-const test1 = rpkg('hello');
-const test2 = rpkg('hello', {});
-const test3 = rpkg('hello', { cwd: true });
+// $ExpectType string
+rpkg('hello');
+rpkg('hello', {});
+rpkg('hello', { cwd: true });
+
+const resolvePkgOpts: resolvePkg.Options = {};