diff --git a/.gitignore b/.gitignore
index a06aeca..1c67014 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,10 @@
 node_modules
+build
 dist
 .docs
 .coverage
+node_modules
 package-lock.json
 yarn.lock
-
 go-libp2p-webtransport-server/main
+.vscode
diff --git a/package.json b/package.json
index 96d8c3b..54cb4af 100644
--- a/package.json
+++ b/package.json
@@ -167,7 +167,7 @@
     "uint8arraylist": "^2.3.3"
   },
   "devDependencies": {
-    "aegir": "^37.5.6",
+    "aegir": "^38.1.7",
     "libp2p": "^0.42.0"
   },
   "browser": {
diff --git a/src/index.ts b/src/index.ts
index fbe0def..60342a5 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -50,7 +50,7 @@ async function webtransportBiDiStreamToStream (bidiStream: any, streamId: string
   const reader = bidiStream.readable.getReader()
   await writer.ready
 
-  function cleanupStreamFromActiveStreams () {
+  function cleanupStreamFromActiveStreams (): void {
     const index = activeStreams.findIndex(s => s === stream)
     if (index !== -1) {
       activeStreams.splice(index, 1)
@@ -138,7 +138,7 @@ async function webtransportBiDiStreamToStream (bidiStream: any, streamId: string
       stream.close()
     },
     stat: {
-      direction: direction,
+      direction,
       timeline: { open: Date.now() }
     },
     metadata: {},
@@ -276,7 +276,7 @@ class WebTransport implements Transport {
     }
   }
 
-  get [Symbol.toStringTag] () {
+  get [Symbol.toStringTag] (): '@libp2p/webtransport' {
     return '@libp2p/webtransport'
   }
 
@@ -476,7 +476,7 @@ class WebTransport implements Transport {
   /**
    * Takes a list of `Multiaddr`s and returns only valid webtransport addresses.
    */
-  filter (multiaddrs: Multiaddr[]) {
+  filter (multiaddrs: Multiaddr[]): Multiaddr[] {
     return multiaddrs.filter(ma => ma.protoNames().includes('webtransport'))
   }
 }
diff --git a/test/browser.ts b/test/browser.ts
index c33ba3e..5bbca13 100644
--- a/test/browser.ts
+++ b/test/browser.ts
@@ -60,7 +60,7 @@ describe('libp2p-webtransport', () => {
         res = Date.now() - now
       })())
 
-      await stream.close()
+      stream.close()
 
       expect(res).to.be.greaterThan(-1)
     }
@@ -99,7 +99,7 @@ describe('libp2p-webtransport', () => {
       connectionEncryption: [noise()]
     })
 
-    async function * gen () {
+    async function * gen (): AsyncGenerator<Uint8Array, void, unknown> {
       yield new Uint8Array([0])
       yield new Uint8Array([1, 2, 3, 4])
       yield new Uint8Array([5, 6, 7])