solve build issue

Author: angular-bootstrap

src/index.ts

@@ -1,3 +1,4 @@
+/// <reference path="./types/optional-peer-deps.d.ts" />
 export * from './datagrid';
 export * from './drag-drop';
 export * from './pagination';

src/types/optional-peer-deps.d.ts

@@ -0,0 +1,3 @@
+declare module 'jspdf';
+declare module 'jspdf-autotable';
+declare module 'xlsx';

tsconfig.lib.json

@@ -12,5 +12,5 @@
     "jest.config.ts",
     "**/*.test.ts"
   ],
-  "include": ["src/**/*.ts"]
+  "include": ["src/**/*.ts", "src/**/*.d.ts"]
 }