Summary

when the language server initially starts, the correct diagnostics are returned, however when subsequent changes are made to the document that would change the diagnostics, the language server still returns the outdated diagnostics.

to reproduce

1. create a python file with a type error in it:

   asdf 

2. (re)start the ty language server
3. see the textDocument/diagnostic result:

   [Trace - 6:14:49 PM] Sending request 'textDocument/diagnostic - (18)'.
   Params: {
       "identifier": "ty",
       "textDocument": {
           "uri": "file:///c%3A/Users/user/Documents/asdfads/test.py"
       }
   }
   
   
   [Trace - 6:14:49 PM] Received response 'textDocument/diagnostic - (18)' in 1ms.
   Result: {
       "items": [
           {
               "code": "unresolved-reference",
               "codeDescription": {
                   "href": "https://ty.dev/rules#unresolved-reference"
               },
               "message": "Name `asdf` used when not defined",
               "range": {
                   "end": {
                       "character": 4,
                       "line": 0
                   },
                   "start": {
                       "character": 0,
                       "line": 0
                   }
               },
               "relatedInformation": [],
               "severity": 1,
               "source": "ty"
           }
       ],
       "kind": "full"
   }
   

4. delete/comment out the line with the type error:

   # asdf

5. check the new textDocument/diagnostics response:

   [Trace - 6:15:15 PM] Sending request 'textDocument/diagnostic - (29)'.
   Params: {
       "identifier": "ty",
       "textDocument": {
           "uri": "file:///c%3A/Users/user/Documents/asdfads/test.py"
       }
   }
   
   
   [Trace - 6:15:15 PM] Received response 'textDocument/diagnostic - (29)' in 1ms.
   Result: {
       "items": [
           {
               "code": "unresolved-reference",
               "codeDescription": {
                   "href": "https://ty.dev/rules#unresolved-reference"
               },
               "message": "Name `asdf` used when not defined",
               "range": {
                   "end": {
                       "character": 4,
                       "line": 0
                   },
                   "start": {
                       "character": 0,
                       "line": 0
                   }
               },
               "relatedInformation": [],
               "severity": 1,
               "source": "ty"
           }
       ],
       "kind": "full"
   }
   

environment

ty vscode extension v2025.15.11531247
OS: windows 10

Version

0.0.1-alpha.8 (c1337c9 2025-06-02)