diff --git a/src/react-app-env.d.ts b/src/react-app-env.d.ts
index 6431bc5..12c6ef2 100644
--- a/src/react-app-env.d.ts
+++ b/src/react-app-env.d.ts
@@ -1 +1,16 @@
 /// <reference types="react-scripts" />
+
+// TODO: Type the rest of the API and contribute it to the wormhole-crypto project
+declare module 'wormhole-crypto' {
+  export class Keychain {
+    constructor(key: Uint8Array, salt: Uint8Array)
+
+    encryptStream(ReadableStream): Promise<ReadableStream>
+
+    decryptStream(ReadableStream): Promise<ReadableStream>
+  }
+
+  export const plaintextSize = number => number
+
+  export const encryptedSize = number => number
+}
diff --git a/src/services/FileTransfer/FileTransfer.ts b/src/services/FileTransfer/FileTransfer.ts
index e0407fc..687233b 100644
--- a/src/services/FileTransfer/FileTransfer.ts
+++ b/src/services/FileTransfer/FileTransfer.ts
@@ -1,6 +1,5 @@
 import WebTorrent, { Torrent, TorrentFile } from 'webtorrent'
 import streamSaver from 'streamsaver'
-// @ts-ignore
 import { Keychain, plaintextSize, encryptedSize } from 'wormhole-crypto'
 // @ts-ignore
 import idbChunkStore from 'idb-chunk-store'