diff --git a/types/node-xlsx/index.d.ts b/types/node-xlsx/index.d.ts
index 4b9432da76..10540a6f80 100644
--- a/types/node-xlsx/index.d.ts
+++ b/types/node-xlsx/index.d.ts
@@ -1,6 +1,7 @@
-// Type definitions for node-xlsx 0.12
+// Type definitions for node-xlsx 0.15
 // Project: https://github.com/mgcrea/node-xlsx#readme
 // Definitions by: chenc <https://github.com/cWatermelon>
+//                 kinuxroot <https://github.com/kinuxroot>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 3.0
 
@@ -25,7 +26,7 @@ export function parse(
  * @returns returns a buffer of worksheets
  */
 export function build(
-    worksheets: Array<{ name: string; data: any[][] }>,
+    worksheets: Array<{ name: string; data: any[][]; options?: {} }>,
     options?: {}
 ): ArrayBuffer;
 declare const _default: {
diff --git a/types/node-xlsx/node-xlsx-tests.ts b/types/node-xlsx/node-xlsx-tests.ts
index f9dffcad47..660329f67d 100644
--- a/types/node-xlsx/node-xlsx-tests.ts
+++ b/types/node-xlsx/node-xlsx-tests.ts
@@ -5,4 +5,9 @@ const data = [
     ['foo', 'bar', new Date('2014-02-19T14:30Z'), '0.3'],
     ['baz', null, 'qux'],
 ];
-const buffer = build([{ name: 'mySheetName', data }]);
+
+const options =  { '!merges': [{ s: { c: 0, r: 0 }, e: { c: 11, r: 0 } }] };
+
+const buffer1 = build([{ name: 'mySheetName1', data }]);
+const buffer2 = build([{ name: 'mySheetName2', data }], options);
+const buffer3 = build([{ name: 'mySheetName3', data, options}]);