diff --git a/autoload/ale/lsp/response.vim b/autoload/ale/lsp/response.vim
index 13219ef..5a43128 100644
--- a/autoload/ale/lsp/response.vim
+++ b/autoload/ale/lsp/response.vim
@@ -59,6 +59,14 @@ function! ale#lsp#response#ReadTSServerDiagnostics(response) abort
             let l:loclist_item.nr = l:diagnostic.code
         endif
 
+        if get(l:diagnostic, 'category') is# 'warning'
+            let l:loclist_item.type = 'W'
+        endif
+
+        if get(l:diagnostic, 'category') is# 'suggestion'
+            let l:loclist_item.type = 'I'
+        endif
+
         call add(l:loclist, l:loclist_item)
     endfor
 
diff --git a/test/lsp/test_read_lsp_diagnostics.vader b/test/lsp/test_read_lsp_diagnostics.vader
index 3e63741..444272a 100644
--- a/test/lsp/test_read_lsp_diagnostics.vader
+++ b/test/lsp/test_read_lsp_diagnostics.vader
@@ -121,7 +121,8 @@ Execute(ale#lsp#response#ReadDiagnostics() should handle multiple messages):
   \ ]}})
 
 Execute(ale#lsp#response#ReadTSServerDiagnostics() should handle tsserver responses):
-  AssertEqual [
+  AssertEqual
+  \ [
   \   {
   \     'type': 'E',
   \     'nr': 2365,
@@ -131,5 +132,35 @@ Execute(ale#lsp#response#ReadTSServerDiagnostics() should handle tsserver respon
   \     'end_lnum': 1,
   \     'end_col': 17,
   \   },
-  \],
+  \ ],
   \ ale#lsp#response#ReadTSServerDiagnostics({"seq":0,"type":"event","event":"semanticDiag","body":{"file":"/bar/foo.ts","diagnostics":[{"start":{"line":1,"offset":11},"end":{"line":1,"offset":17},"text":"Operator ''+'' cannot be applied to types ''3'' and ''{}''.","code":2365}]}})
+
+Execute(ale#lsp#response#ReadTSServerDiagnostics() should handle warnings from tsserver):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 27,
+  \     'col': 3,
+  \     'nr': 2515,
+  \     'end_lnum': 27,
+  \     'type': 'W',
+  \     'end_col': 14,
+  \     'text': 'Calls to ''console.log'' are not allowed. (no-console)',
+  \   }
+  \ ],
+  \ ale#lsp#response#ReadTSServerDiagnostics({"seq":0,"type":"event","event":"semanticDiag","body":{"file":"<removed>","diagnostics":[{"start":{"line":27,"offset":3},"end":{"line":27,"offset":14},"text":"Calls to 'console.log' are not allowed. (no-console)","code":2515,"category":"warning","source":"tslint"}]}})
+
+Execute(ale#lsp#response#ReadTSServerDiagnostics() should handle suggestions from tsserver):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 27,
+  \     'col': 3,
+  \     'nr': 2515,
+  \     'end_lnum': 27,
+  \     'type': 'I',
+  \     'end_col': 14,
+  \     'text': 'Some info',
+  \   }
+  \ ],
+  \ ale#lsp#response#ReadTSServerDiagnostics({"seq":0,"type":"event","event":"semanticDiag","body":{"file":"<removed>","diagnostics":[{"start":{"line":27,"offset":3},"end":{"line":27,"offset":14},"text":"Some info","code":2515,"category":"suggestion","source":"tslint"}]}})