Added Type for the real useages of pdf Operations

shared-operations/src/index.ts

@@ -11,7 +11,7 @@ import { splitOn } from './functions/splitOn';
 import { splitPDF } from './functions/splitPDF';
 import { updateMetadata } from "./functions/updateMetadata";
 
-export default {
+const toExport = {
     sortPagesWithPreset, rearrangePages, selectPages, removePages, removeBlankPages,
     impose,
     mergePDFs,
@@ -21,4 +21,12 @@ export default {
     splitOn,
     splitPDF,
     updateMetadata,
-}
+}
+export default toExport;
+
+// Overide fields in the type of toExport, with the given fields and types. This seems to magically work!
+// https://dev.to/vborodulin/ts-how-to-override-properties-with-type-intersection-554l
+type Override<T1, T2> = Omit<T1, keyof T2> & T2;
+export type OperationsUseages = Override<typeof toExport, {
+    impose: (snapshot: any, nup: number, format: string) => any;
+}>;