diff --git a/adapters/vim/collab.vim b/adapters/vim/collab.vim
index 65be146..eaea43e 100644
--- a/adapters/vim/collab.vim
+++ b/adapters/vim/collab.vim
@@ -20,13 +20,13 @@ var peer_match_ids: dict<number> = {}
 # path to bridge script (adjust as needed)
 const bridge_script = expand('<sfile>:p:h') .. '/bridge.ts'
 
-def Send(msg: dict<any>)
+def Send(msg: dict<any>): void
     if bridge_channel != null_channel
         ch_sendraw(bridge_channel, json_encode(msg) .. "\n")
     endif
 enddef
 
-def OnOutput(ch: channel, msg: string)
+def OnOutput(ch: channel, msg: string): void
     if empty(msg)
         return
     endif
@@ -56,7 +56,7 @@ def OnOutput(ch: channel, msg: string)
     endif
 enddef
 
-def ApplyRemoteContent(content: string)
+def ApplyRemoteContent(content: string): void
     if suppressing
         return
     endif
@@ -69,7 +69,7 @@ def ApplyRemoteContent(content: string)
     suppressing = false
 enddef
 
-def SendBuffer()
+def SendBuffer(): void
     if !connected || suppressing
         return
     endif
@@ -78,7 +78,7 @@ def SendBuffer()
     Send({type: 'content', text: content})
 enddef
 
-def SendCursor()
+def SendCursor(): void
     if !connected
         return
     endif
@@ -87,7 +87,7 @@ def SendCursor()
     Send({type: 'cursor', line: pos[1] - 1, col: pos[2] - 1})
 enddef
 
-def ShowPeerCursor(data: dict<any>)
+def ShowPeerCursor(data: dict<any>): void
     const client_id = string(data.clientId)
 
     # Clear previous highlight for this peer
@@ -104,14 +104,14 @@ def ShowPeerCursor(data: dict<any>)
     peer_match_ids[client_id] = matchadd('PeerCursor', pattern, 10)
 enddef
 
-def ClearPeerCursors()
+def ClearPeerCursors(): void
     for id in values(peer_match_ids)
         silent! matchdelete(id)
     endfor
     peer_match_ids = {}
 enddef
 
-export def Connect(room_name: string)
+export def Connect(room_name: string): void
     if bridge_job != null_job
         Disconnect()
     endif
@@ -148,7 +148,7 @@ export def Connect(room_name: string)
     augroup END
 enddef
 
-export def Disconnect()
+export def Disconnect(): void
     if bridge_job != null_job
         Send({type: 'disconnect'})
         job_stop(bridge_job)
@@ -165,7 +165,7 @@ export def Disconnect()
     echom '[collab] disconnected'
 enddef
 
-export def Status()
+export def Status(): void
     if connected
         echom '[collab] connected to room: ' .. room
     else