diff --git a/packages/transport-webtransport/src/index.ts b/packages/transport-webtransport/src/index.ts
index e7d37dbf43..3144df92d2 100644
--- a/packages/transport-webtransport/src/index.ts
+++ b/packages/transport-webtransport/src/index.ts
@@ -12,16 +12,6 @@ import type { StreamMuxerFactory, StreamMuxerInit, StreamMuxer } from '@libp2p/i
 import type { Source } from 'it-stream-types'
 import type { MultihashDigest } from 'multiformats/hashes/interface'
 
-declare global {
-  var WebTransport: any
-}
-
-// https://www.w3.org/TR/webtransport/#web-transport-close-info
-interface WebTransportCloseInfo {
-  closeCode: number
-  reason: string
-}
-
 interface WebTransportSessionCleanup {
   (closeInfo?: WebTransportCloseInfo): void
 }
@@ -197,7 +187,7 @@ class WebTransportTransport implements Transport {
             yield val.value
           }
 
-          if (val.done === true) {
+          if (val.done) {
             break
           }
         }
@@ -230,7 +220,7 @@ class WebTransportTransport implements Transport {
     return true
   }
 
-  webtransportMuxer (wt: InstanceType<typeof WebTransport>, cleanUpWTSession: WebTransportSessionCleanup): StreamMuxerFactory {
+  webtransportMuxer (wt: WebTransport, cleanUpWTSession: WebTransportSessionCleanup): StreamMuxerFactory {
     let streamIDCounter = 0
     const config = this.config
     return {
@@ -252,7 +242,7 @@ class WebTransportTransport implements Transport {
           while (true) {
             const { done, value: wtStream } = await reader.read()
 
-            if (done === true) {
+            if (done) {
               break
             }
 
diff --git a/packages/transport-webtransport/src/stream.ts b/packages/transport-webtransport/src/stream.ts
index b0fb99e32d..8d9a1e8a3a 100644
--- a/packages/transport-webtransport/src/stream.ts
+++ b/packages/transport-webtransport/src/stream.ts
@@ -6,7 +6,7 @@ import type { Source } from 'it-stream-types'
 
 const log = logger('libp2p:webtransport:stream')
 
-export async function webtransportBiDiStreamToStream (bidiStream: any, streamId: string, direction: Direction, activeStreams: Stream[], onStreamEnd: undefined | ((s: Stream) => void)): Promise<Stream> {
+export async function webtransportBiDiStreamToStream (bidiStream: WebTransportBidirectionalStream, streamId: string, direction: Direction, activeStreams: Stream[], onStreamEnd: undefined | ((s: Stream) => void)): Promise<Stream> {
   const writer = bidiStream.writable.getWriter()
   const reader = bidiStream.readable.getReader()
   await writer.ready
@@ -60,6 +60,9 @@ export async function webtransportBiDiStreamToStream (bidiStream: any, streamId:
     abort (err: Error) {
       if (!writerClosed) {
         writer.abort(err)
+          .catch(err => {
+            log.error('could not abort stream', err)
+          })
         writerClosed = true
       }
       readerClosed = true
@@ -140,7 +143,7 @@ export async function webtransportBiDiStreamToStream (bidiStream: any, streamId:
     source: (async function * () {
       while (true) {
         const val = await reader.read()
-        if (val.done === true) {
+        if (val.done) {
           readerClosed = true
           if (writerClosed) {
             cleanupStreamFromActiveStreams()
diff --git a/packages/transport-webtransport/test/browser.ts b/packages/transport-webtransport/test/browser.ts
index 0cf27d2ddf..adf60845c8 100644
--- a/packages/transport-webtransport/test/browser.ts
+++ b/packages/transport-webtransport/test/browser.ts
@@ -7,12 +7,6 @@ import { expect } from 'aegir/chai'
 import { createLibp2p, type Libp2p } from 'libp2p'
 import { webTransport } from '../src/index.js'
 
-declare global {
-  interface Window {
-    WebTransport: any
-  }
-}
-
 describe('libp2p-webtransport', () => {
   let node: Libp2p