export things I need (#240)

Author: mayakoneval

.changeset/brave-moose-hang.md

@@ -0,0 +1,5 @@
+---
+'@apollo/explorer-helpers': patch
+---
+
+export more types I forgot to

packages/explorer-helpers/src/index.ts

@@ -1,8 +1,12 @@
-export { constructMultipartForm } from './constructMultipartForm';
+export {
+  constructMultipartForm,
+  getFileListFromTransfer,
+} from './constructMultipartForm';
 export { readMultipartWebStream } from './readMultipartWebStream';
 export type {
   FileVariable,
   FileVariableFromTransfer,
+  OperationRequestBody,
 } from './constructMultipartForm';
 export type {
   MultipartResponse,