Fix exports for HttpStack modules

Author: m7kvqbe1

lib/browser/index.ts

@@ -58,4 +58,6 @@ const isSupported =
 // Note: The exported interface must be the same as in lib/node/index.ts.
 // Any changes should be reflected in both files.
 export { Upload, defaultOptions, isSupported, canStoreURLs, enableDebugLog, DetailedError }
+export { XHRHttpStack } from './XHRHttpStack.js'
+export { FetchHttpStack } from './FetchHttpStack.js'
 export type * from '../options.js'

lib/node/index.ts

@@ -56,4 +56,5 @@ const isSupported = true
 // Note: The exported interface must be the same as in lib/browser/index.ts.
 // Any changes should be reflected in both files.
 export { Upload, defaultOptions, isSupported, canStoreURLs, enableDebugLog, DetailedError }
+export { NodeHttpStack } from './NodeHttpStack.js'
 export type * from '../options.js'