Quietly add go to definition support for tsserver

autoload/ale/lsp/tsserver_message.vim

@@ -53,3 +53,11 @@ function! ale#lsp#tsserver_message#CompletionEntryDetails(buffer, line, column,
     \   'entryNames': a:entry_names,
     \}]
 endfunction
+
+function! ale#lsp#tsserver_message#Definition(buffer, line, column) abort
+    return [0, 'ts@definition', {
+    \   'line': a:line,
+    \   'offset': a:column,
+    \   'file': expand('#' . a:buffer . ':p'),
+    \}]
+endfunction