diff --git a/src/vector/index.js b/src/vector/index.ts
similarity index 98%
rename from src/vector/index.js
rename to src/vector/index.ts
index 9ad72870e1..74db1cd687 100644
--- a/src/vector/index.js
+++ b/src/vector/index.ts
@@ -32,7 +32,7 @@ if ('serviceWorker' in navigator) {
     navigator.serviceWorker.register('sw.js');
 }
 
-async function settled(prom) {
+async function settled(prom: Promise<any>) {
     try {
         await prom;
     } catch (e) {
diff --git a/src/vector/rageshakesetup.ts b/src/vector/rageshakesetup.ts
index cef9d53823..e495557429 100644
--- a/src/vector/rageshakesetup.ts
+++ b/src/vector/rageshakesetup.ts
@@ -31,7 +31,8 @@ import SdkConfig from "matrix-react-sdk/src/SdkConfig";
 import sendBugReport from "matrix-react-sdk/src/rageshake/submit-rageshake";
 
 export function initRageshake() {
-    rageshake.init().then(() => {
+    const prom = rageshake.init();
+    prom.then(() => {
         console.log("Initialised rageshake.");
         console.log("To fix line numbers in Chrome: " +
             "Meatball menu → Settings → Blackboxing → Add /rageshake\\.js$");
@@ -46,6 +47,7 @@ export function initRageshake() {
     }, (err) => {
         console.error("Failed to initialise rageshake: " + err);
     });
+    return prom;
 }
 
 window.mxSendRageshake = function(text: string, withLogs?: boolean) {