diff --git a/internal/lsp/cmd/imports.go b/internal/lsp/cmd/imports.go
index 2b8b13e947..2127e25ab8 100644
--- a/internal/lsp/cmd/imports.go
+++ b/internal/lsp/cmd/imports.go
@@ -69,11 +69,7 @@ func (t *imports) Run(ctx context.Context, args ...string) error {
 		return errors.Errorf("%v: %v", from, err)
 	}
 	var edits []protocol.TextEdit
-	v, ok := actions.([]protocol.CodeAction)
-	if !ok {
-		return errors.Errorf("expected CodeAction, got %T", actions)
-	}
-	for _, a := range v {
+	for _, a := range actions {
 		if a.Title != "Organize Imports" {
 			continue
 		}
diff --git a/internal/lsp/cmd/suggested_fix.go b/internal/lsp/cmd/suggested_fix.go
index 2687821f08..15c6bc9983 100644
--- a/internal/lsp/cmd/suggested_fix.go
+++ b/internal/lsp/cmd/suggested_fix.go
@@ -87,11 +87,7 @@ func (s *suggestedfix) Run(ctx context.Context, args ...string) error {
 		return errors.Errorf("%v: %v", from, err)
 	}
 	var edits []protocol.TextEdit
-	v, ok := actions.([]protocol.CodeAction)
-	if !ok {
-		return errors.Errorf("expected CodeAction, got %T", actions)
-	}
-	for _, a := range v {
+	for _, a := range actions {
 		if !a.IsPreferred && !s.All {
 			continue
 		}
diff --git a/internal/lsp/lsp_test.go b/internal/lsp/lsp_test.go
index 4ddc5abd4b..23d3927d47 100644
--- a/internal/lsp/lsp_test.go
+++ b/internal/lsp/lsp_test.go
@@ -314,9 +314,8 @@ func (r *runner) Import(t *testing.T, spn span.Span) {
 		t.Fatal(err)
 	}
 	got := string(m.Content)
-	xact := actions.([]protocol.CodeAction)
-	if len(xact) > 0 {
-		res, err := applyWorkspaceEdits(r, xact[0].Edit)
+	if len(actions) > 0 {
+		res, err := applyWorkspaceEdits(r, actions[0].Edit)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -355,11 +354,10 @@ func (r *runner) SuggestedFix(t *testing.T, spn span.Span) {
 		t.Fatal(err)
 	}
 	// TODO: This test should probably be able to handle multiple code actions.
-	xact := actions.([]protocol.CodeAction)
-	if len(xact) > 1 {
+	if len(actions) > 1 {
 		t.Fatal("expected only 1 code action")
 	}
-	res, err := applyWorkspaceEdits(r, xact[0].Edit)
+	res, err := applyWorkspaceEdits(r, actions[0].Edit)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/lsp/protocol/tsserver.go b/internal/lsp/protocol/tsserver.go
index f6593cbf64..8850d99c60 100644
--- a/internal/lsp/protocol/tsserver.go
+++ b/internal/lsp/protocol/tsserver.go
@@ -3,7 +3,7 @@ package protocol
 // Package protocol contains data types and code for LSP jsonrpcs
 // generated automatically from vscode-languageserver-node
 // commit: 635ab1fe6f8c57ce9402e573d007f24d6d290fd3
-// last fetched Sun Oct 13 2019 10:14:32 GMT-0400 (Eastern Daylight Time)
+// last fetched Mon Oct 14 2019 09:09:30 GMT-0400 (Eastern Daylight Time)
 
 // Code generated (see typescript/README.md) DO NOT EDIT.
 
@@ -27,7 +27,6 @@ type Server interface {
 	DidSave(context.Context, *DidSaveTextDocumentParams) error
 	WillSave(context.Context, *WillSaveTextDocumentParams) error
 	DidChangeWatchedFiles(context.Context, *DidChangeWatchedFilesParams) error
-	CancelRequest(context.Context, *CancelParams) error
 	Progress(context.Context, *ProgressParams) error
 	SetTraceNotification(context.Context, *SetTraceParams) error
 	LogTraceNotification(context.Context, *LogTraceParams) error
@@ -49,7 +48,7 @@ type Server interface {
 	References(context.Context, *ReferenceParams) ([]Location /*Location[] | null*/, error)
 	DocumentHighlight(context.Context, *DocumentHighlightParams) ([]DocumentHighlight /*DocumentHighlight[] | null*/, error)
 	DocumentSymbol(context.Context, *DocumentSymbolParams) ([]DocumentSymbol /*SymbolInformation[] | DocumentSymbol[] | null*/, error)
-	CodeAction(context.Context, *CodeActionParams) (interface{} /*Command | CodeAction*/ /*(Command | CodeAction)[] | null*/, error)
+	CodeAction(context.Context, *CodeActionParams) ([]CodeAction /*(Command | CodeAction)[] | null*/, error)
 	Symbol(context.Context, *WorkspaceSymbolParams) ([]SymbolInformation /*SymbolInformation[] | null*/, error)
 	CodeLens(context.Context, *CodeLensParams) ([]CodeLens /*CodeLens[] | null*/, error)
 	ResolveCodeLens(context.Context, *CodeLens) (*CodeLens, error)
@@ -168,16 +167,6 @@ func (h serverHandler) Deliver(ctx context.Context, r *jsonrpc2.Request, deliver
 			log.Error(ctx, "", err)
 		}
 		return true
-	case "$/cancelRequest": // notif
-		var params CancelParams
-		if err := json.Unmarshal(*r.Params, &params); err != nil {
-			sendParseError(ctx, r, err)
-			return true
-		}
-		if err := h.server.CancelRequest(ctx, &params); err != nil {
-			log.Error(ctx, "", err)
-		}
-		return true
 	case "$/progress": // notif
 		var params ProgressParams
 		if err := json.Unmarshal(*r.Params, &params); err != nil {
@@ -587,10 +576,6 @@ func (s *serverDispatcher) DidChangeWatchedFiles(ctx context.Context, params *Di
 	return s.Conn.Notify(ctx, "workspace/didChangeWatchedFiles", params)
 }
 
-func (s *serverDispatcher) CancelRequest(ctx context.Context, params *CancelParams) error {
-	return s.Conn.Notify(ctx, "$/cancelRequest", params)
-}
-
 func (s *serverDispatcher) Progress(ctx context.Context, params *ProgressParams) error {
 	return s.Conn.Notify(ctx, "$/progress", params)
 }
@@ -742,8 +727,8 @@ func (s *serverDispatcher) DocumentSymbol(ctx context.Context, params *DocumentS
 	return result, nil
 }
 
-func (s *serverDispatcher) CodeAction(ctx context.Context, params *CodeActionParams) (interface{} /*Command | CodeAction*/ /*(Command | CodeAction)[] | null*/, error) {
-	var result interface{} /*Command | CodeAction*/ /*(Command | CodeAction)[] | null*/
+func (s *serverDispatcher) CodeAction(ctx context.Context, params *CodeActionParams) ([]CodeAction /*(Command | CodeAction)[] | null*/, error) {
+	var result []CodeAction /*(Command | CodeAction)[] | null*/
 	if err := s.Conn.Call(ctx, "textDocument/codeAction", params, &result); err != nil {
 		return nil, err
 	}
diff --git a/internal/lsp/server.go b/internal/lsp/server.go
index c779adaddb..c13047c5ba 100644
--- a/internal/lsp/server.go
+++ b/internal/lsp/server.go
@@ -201,7 +201,7 @@ func (s *Server) DocumentSymbol(ctx context.Context, params *protocol.DocumentSy
 	return s.documentSymbol(ctx, params)
 }
 
-func (s *Server) CodeAction(ctx context.Context, params *protocol.CodeActionParams) (interface{}, error) {
+func (s *Server) CodeAction(ctx context.Context, params *protocol.CodeActionParams) ([]protocol.CodeAction, error) {
 	return s.codeAction(ctx, params)
 }