diff --git a/e2e/package.json b/e2e/package.json
index 23a067fc32..fefa21b753 100644
--- a/e2e/package.json
+++ b/e2e/package.json
@@ -46,6 +46,7 @@
   },
   "devDependencies": {
     "@parcel/transformer-vue": "^2.9.3",
+    "@transloadit/ts-fly": "^0.1.4",
     "cypress": "^13.0.0",
     "cypress-terminal-report": "^6.0.0",
     "deep-freeze": "^0.0.1",
diff --git a/e2e/start-companion-with-load-balancer.mjs b/e2e/start-companion-with-load-balancer.mjs
index d228df8802..eb6569dacf 100755
--- a/e2e/start-companion-with-load-balancer.mjs
+++ b/e2e/start-companion-with-load-balancer.mjs
@@ -51,10 +51,11 @@ const isOSX = process.platform === 'darwin'
 
 const startCompanion = ({ name, port }) => {
   const cp = spawn(process.execPath, [
+    '-r', '@transloadit/ts-fly',
     '-r', 'dotenv/config',
     // Watch mode support is limited to Windows and macOS at the time of writing.
     ...(isWindows || isOSX ? ['--watch-path', 'packages/@uppy/companion/src', '--watch'] : []),
-    './packages/@uppy/companion/src/standalone/start-server.js',
+    './packages/@uppy/companion/src/standalone/start-server.ts',
   ], {
     cwd: new URL('../', import.meta.url),
     stdio: 'inherit',
diff --git a/yarn.lock b/yarn.lock
index c53f82a764..c4aa234e4d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7324,6 +7324,18 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@transloadit/ts-fly@npm:^0.1.4":
+  version: 0.1.5
+  resolution: "@transloadit/ts-fly@npm:0.1.5"
+  dependencies:
+    pirates: "npm:^4.0.5"
+    sucrase: "npm:^3.32.0"
+  bin:
+    ts-fly: ./bin/ts-fly
+  checksum: 10/efaae2763e5e1942a85798768b235ba9d4dedecc90a24e2063b95887d48006c132943552a2c836f297145b28ab5bed11ec1c48b02c784fccc55bc7a035411806
+  languageName: node
+  linkType: hard
+
 "@trysound/sax@npm:0.2.0":
   version: 0.2.0
   resolution: "@trysound/sax@npm:0.2.0"
@@ -13690,6 +13702,7 @@ __metadata:
   resolution: "e2e@workspace:e2e"
   dependencies:
     "@parcel/transformer-vue": "npm:^2.9.3"
+    "@transloadit/ts-fly": "npm:^0.1.4"
     "@uppy/audio": "workspace:^"
     "@uppy/aws-s3": "workspace:^"
     "@uppy/aws-s3-multipart": "workspace:^"
@@ -24338,7 +24351,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"pirates@npm:^4.0.1, pirates@npm:^4.0.4, pirates@npm:^4.0.6":
+"pirates@npm:^4.0.1, pirates@npm:^4.0.4, pirates@npm:^4.0.5, pirates@npm:^4.0.6":
   version: 4.0.6
   resolution: "pirates@npm:4.0.6"
   checksum: 10/d02dda76f4fec1cbdf395c36c11cf26f76a644f9f9a1bfa84d3167d0d3154d5289aacc72677aa20d599bb4a6937a471de1b65c995e2aea2d8687cbcd7e43ea5f
@@ -28523,7 +28536,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"sucrase@npm:^3.20.0":
+"sucrase@npm:^3.20.0, sucrase@npm:^3.32.0":
   version: 3.35.0
   resolution: "sucrase@npm:3.35.0"
   dependencies: