LSP deadlock in completion resolving

[rchl]

Summary

With latest version of typescript-language-server helix often deadlocks (until timeout happens) when resolving completions triggering a "Failed to resolve completion item" message in the logs.

What tls does is it triggers a workspace/configuration request during handling of completionItem/resolve. What Helix seems to do (sometimes) is not respond to that configuration request which means that the tls server is blocked until the request timeouts.

My guess as to why Helix doesn't respond is that it decided to trigger redundant completionItem/resolve right after the first one and kinda abandoned handling of the first one. This might be the main issue here. There doesn't seem to be a good reason for triggering completion resolving for the same item twice.

Reproduction Steps

1. trigger completions
2. press down arrow to select first completion and then quickly press enter

Recording: https://asciinema.org/a/4yvWIED5BS9Varn4qbDVflzu6

Helix log

~/.cache/helix/helix.log

2025-11-05T12:21:24.811 helix_lsp::transport [INFO] typescript-language-server -> {"jsonrpc":"2.0","method":"textDocument/didChange","params":{"contentChanges":[{"range":{"end":{"character":7,"line":17},"start":{"character":7,"line":17}},"text":"t"}],"textDocument":{"uri":"file:///usr/local/workspace/github/typescript-language-server/src/cli.ts","version":16}}}
2025-11-05T12:21:25.064 helix_lsp::transport [INFO] typescript-language-server -> {"jsonrpc":"2.0","method":"textDocument/completion","params":{"context":{"triggerKind":1},"position":{"character":8,"line":17},"textDocument":{"uri":"file:///usr/local/workspace/github/typescript-language-server/src/cli.ts"}},"id":5}
2025-11-05T12:21:25.067 helix_lsp::transport [INFO] typescript-language-server <- {"jsonrpc":"2.0","id":3,"method":"workspace/configuration","params":{"items":[{"scopeUri":"file:///usr/local/workspace/github/typescript-language-server/src/cli.ts","section":"formattingOptions"}]}}
2025-11-05T12:21:25.071 helix_lsp::transport [INFO] typescript-language-server -> {"jsonrpc":"2.0","result":[null],"id":3}
2025-11-05T12:21:25.099 helix_lsp::transport [INFO] typescript-language-server <- {"jsonrpc":"2.0","id":5,"result":{"items":[{"label":"action","kind":2,"sortText":"11","data":{"cacheId":1},"textEdit":{"newText":"action","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"addArgument","kind":2,"sortText":"11","data":{"cacheId":2},"textEdit":{"newText":"addArgument","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"addCommand","kind":2,"sortText":"11","data":{"cacheId":3},"textEdit":{"newText":"addCommand","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"addHelpCommand","kind":2,"sortText":"11","data":{"cacheId":4},"textEdit":{"newText":"addHelpCommand","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"addHelpOption","kind":2,"sortText":"11","data":{"cacheId":5},"textEdit":{"newText":"addHelpOption","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"addHelpText","kind":2,"sortText":"11","data":{"cacheId":6},"textEdit":{"newText":"addHelpText","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"addOption","kind":2,"sortText":"11","data":{"cacheId":7},"textEdit":{"newText":"addOption","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"alias","kind":2,"sortText":"11","data":{"cacheId":8},"textEdit":{"newText":"alias","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"aliases","kind":2,"sortText":"11","data":{"cacheId":9},"textEdit":{"newText":"aliases","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"allowExcessArguments","kind":2,"sortText":"11","data":{"cacheId":10},"textEdit":{"newText":"allowExcessArguments","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"allowUnknownOption","kind":2,"sortText":"11","data":{"cacheId":11},"textEdit":{"newText":"allowUnknownOption","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"args","kind":5,"sortText":"11","data":{"cacheId":12},"textEdit":{"newText":"args","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"argument","kind":2,"sortText":"11","data":{"cacheId":13},"textEdit":{"newText":"argument","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"arguments","kind":2,"sortText":"11","data":{"cacheId":14},"textEdit":{"newText":"arguments","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"combineFlagAndOptionalValue","kind":2,"sortText":"11","data":{"cacheId":15},"textEdit":{"newText":"combineFlagAndOptionalValue","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"command","kind":2,"sortText":"11","data":{"cacheId":16},"textEdit":{"newText":"command","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"commands","kind":5,"sortText":"11","data":{"cacheId":17},"textEdit":{"newText":"commands","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"commandsGroup","kind":2,"sortText":"11","data":{"cacheId":18},"textEdit":{"newText":"commandsGroup","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}}}},{"label":"configureHelp","kind":2,"sortText":"11","data":{"cacheId":19},"textEdit":{"newText":"configureHelp","insert":{"start":{"line":17,"character":5},"end":{"character":8,"line":17}},"replace":{"start":{"line":17,"character"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2025-11-05T12:21:25.175 helix_lsp::transport [INFO] typescript-language-server <- {"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///usr/local/workspace/github/typescript-language-server/src/cli.ts","diagnostics":[{"range":{"start":{"line":17,"character":5},"end":{"line":17,"character":8}},"message":"Property 'act' does not exist on type 'Command'.","severity":1,"code":2339,"source":"typescript","tags":[]},{"range":{"start":{"line":19,"character":142},"end":{"line":19,"character":147}},"message":"Parameter 'value' implicitly has an 'any' type.","severity":1,"code":7006,"source":"typescript","tags":[]}]}}
2025-11-05T12:21:25.578 helix_lsp::transport [INFO] typescript-language-server -> {"jsonrpc":"2.0","method":"completionItem/resolve","params":{"data":{"cacheId":1},"kind":2,"label":"action","sortText":"11","textEdit":{"insert":{"end":{"character":8,"line":17},"start":{"character":5,"line":17}},"newText":"action","replace":{"end":{"character":8,"line":17},"start":{"character":5,"line":17}}}},"id":6}
2025-11-05T12:21:25.579 helix_lsp::transport [INFO] typescript-language-server <- {"jsonrpc":"2.0","id":4,"method":"workspace/configuration","params":{"items":[{"scopeUri":"file:///usr/local/workspace/github/typescript-language-server/src/cli.ts","section":"formattingOptions"}]}}
2025-11-05T12:21:25.675 helix_lsp::transport [INFO] typescript-language-server -> {"jsonrpc":"2.0","method":"completionItem/resolve","params":{"data":{"cacheId":1},"kind":2,"label":"action","sortText":"11","textEdit":{"insert":{"end":{"character":8,"line":17},"start":{"character":5,"line":17}},"newText":"action","replace":{"end":{"character":8,"line":17},"start":{"character":5,"line":17}}}},"id":7}
2025-11-05T12:21:25.676 helix_lsp::transport [INFO] typescript-language-server <- {"jsonrpc":"2.0","id":5,"method":"workspace/configuration","params":{"items":[{"scopeUri":"file:///usr/local/workspace/github/typescript-language-server/src/cli.ts","section":"formattingOptions"}]}}
2025-11-05T12:21:45.583 helix_term::ui::completion [ERROR] Failed to resolve completion item: request 6 timed out
2025-11-05T12:21:45.585 helix_lsp::transport [INFO] typescript-language-server -> {"jsonrpc":"2.0","method":"textDocument/didChange","params":{"contentChanges":[{"range":{"end":{"character":8,"line":17},"start":{"character":5,"line":17}},"text":"action"}],"textDocument":{"uri":"file:///usr/local/workspace/github/typescript-language-server/src/cli.ts","version":19}}}
2025-11-05T12:21:45.599 helix_vcs::diff::worker [INFO] Diff computation timed out, update of diffs might appear delayed
2025-11-05T12:21:45.601 helix_lsp::transport [INFO] typescript-language-server -> {"jsonrpc":"2.0","result":[null],"id":4}
2025-11-05T12:21:45.608 helix_lsp::transport [INFO] typescript-language-server -> {"jsonrpc":"2.0","result":[null],"id":5}
2025-11-05T12:21:45.654 helix_lsp::transport [INFO] typescript-language-server <- {"jsonrpc":"2.0","id":6,"result":{"data":{"file":"/usr/local/workspace/github/typescript-language-server/src/cli.ts","line":18,"offset":9,"entryNames":["action"]},"kind":2,"label":"action","sortText":"11","textEdit":{"insert":{"end":{"character":8,"line":17},"start":{"character":5,"line":17}},"newText":"action","replace":{"end":{"character":8,"line":17},"start":{"character":5,"line":17}}},"detail":"(method) Command.action(fn: (this: Command, ...args: any[]) => void | Promise<void>): Command","documentation":{"kind":"markdown","value":"Register callback `fn` for the command.\n\n*@example*  \n```\nprogram\n  .command('serve')\n  .description('start service')\n  .action(function() {\n    // do work here\n  });\n```  \n\n*@returns* — `this` command for chaining"}}}
2025-11-05T12:21:45.654 helix_lsp::transport [ERROR] Tried sending response into a closed channel (id=Num(6)), original request likely timed out
2025-11-05T12:21:45.655 helix_lsp::transport [INFO] typescript-language-server <- {"jsonrpc":"2.0","id":7,"result":{"data":{"file":"/usr/local/workspace/github/typescript-language-server/src/cli.ts","line":18,"offset":9,"entryNames":["action"]},"kind":2,"label":"action","sortText":"11","textEdit":{"insert":{"end":{"character":8,"line":17},"start":{"character":5,"line":17}},"newText":"action","replace":{"end":{"character":8,"line":17},"start":{"character":5,"line":17}}},"detail":"(method) Command.action(fn: (this: Command, ...args: any[]) => void | Promise<void>): Command","documentation":{"kind":"markdown","value":"Register callback `fn` for the command.\n\n*@example*  \n```\nprogram\n  .command('serve')\n  .description('start service')\n  .action(function() {\n    // do work here\n  });\n```  \n\n*@returns* — `this` command for chaining"}}}
2025-11-05T12:21:45.655 helix_lsp::transport [ERROR] Tried sending response into a closed channel (id=Num(7)), original request likely timed out

Platform

macOS

Terminal Emulator

zsh

Installation Method

brew

Helix Version

helix 25.07.1 (a05c151)

[rchl]

I'll be making a change in typescript-language-server to avoid doing a workspace/configuration request during completion resolve which will work around this issue so when testing or fixing please use the 5.1.0 version of tls.

[rchl]

As reported in typescript-language-server/typescript-language-server#1014 (comment), deadlocks also happen on other actions like rename_symbol. In that case there are not even duplicate requests involved. This seems to be caused by some fundamental bug in the LSP client implementaion since nested requests like that are perfectly OK from the LSP spec perspective.