How to configure typescript-language-server?

[yassernasc]

The value I want to update is implicitProjectConfiguration.target from: https://github.com/typescript-language-server/typescript-language-server/blob/master/docs/configuration.md#workspacedidchangeconfiguration

Following https://elpa.gnu.org/devel/doc/eglot.html#Advanced-server-configuration I tried these approaches (and a few variations):

(with-eval-after-load 'eglot
  (add-to-list
   'eglot-server-programs
   '(typescript-ts-mode . ("typescript-language-server" "--stdio" :initializationOptions (:implicitProjectConfiguration (:target "nodenext"))))))

(with-eval-after-load 'eglot
  (setq-default eglot-workspace-configuration '(:implicitProjectConfiguration (:target "nodenext"))))

Apparently no effect.

GNU Emacs 31.0.50;
And the typescript-language-server version is: 5.1.3.

[joaotavora]

Apparently no effect.

Clearly, typescript fairies have eaten your config! 🧚 🧚 🧚 Don't believe me? Prove me wrong!

(hint: to prove me wrong, use M-x eglot-events-buffer or send a reproducible error recipe as described in that page, including a toy project and information about the effect that you expected and the effect you observed.)

It is possible that your plist needs to be: '(:typescript (:implicitProjectConfiguration (:target "nodenext"))) or '(:typescript-language-server (:implicitProjectConfiguration (:target "nodenext"))). Or not.

If nothing works, then I can't help you, because typescript-language-server (at least the one I'm using) is very silent about what it is doing. For example in some microproject where I'm testing something else, this is the conversation. Notices it doesn't say anything about some unrelated "gopls" settings I'm sending it in a didChangeConfiguration

[jsonrpc] D[07:53:38.523] Running language server: typescript-language-server --stdio
[jsonrpc] e[07:53:38.523] --> initialize[1] {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"processId":12723,"clientInfo":{"name":"Eglot","version":"1.19"},"rootPath":"/home/joao/tmp/rass-repro/","rootUri":"file:///home/joao/tmp/rass-repro","initializationOptions":{},"capabilities":{"workspace":{"applyEdit":true,"executeCommand":{"dynamicRegistration":false},"workspaceEdit":{"documentChanges":true},"didChangeWatchedFiles":{"dynamicRegistration":true,"relativePatternSupport":true},"symbol":{"dynamicRegistration":false},"semanticTokens":{"refreshSupport":true},"configuration":true,"workspaceFolders":true},"textDocument":{"synchronization":{"dynamicRegistration":false,"willSave":true,"willSaveWaitUntil":true,"didSave":true},"completion":{"dynamicRegistration":false,"completionItem":{"snippetSupport":true,"deprecatedSupport":true,"resolveSupport":{"properties":["documentation","details","additionalTextEdits"]},"tagSupport":{"valueSet":[1]},"insertReplaceSupport":true},"contextSupport":true},"hover":{"dynamicRegistration":false,"contentFormat":["markdown","plaintext"]},"signatureHelp":{"dynamicRegistration":false,"signatureInformation":{"parameterInformation":{"labelOffsetSupport":true},"documentationFormat":["markdown","plaintext"],"activeParameterSupport":true}},"references":{"dynamicRegistration":false},"definition":{"dynamicRegistration":false,"linkSupport":true},"declaration":{"dynamicRegistration":false,"linkSupport":true},"implementation":{"dynamicRegistration":false,"linkSupport":true},"typeDefinition":{"dynamicRegistration":false,"linkSupport":true},"documentSymbol":{"dynamicRegistration":false,"hierarchicalDocumentSymbolSupport":true,"symbolKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]}},"documentHighlight":{"dynamicRegistration":false},"codeAction":{"dynamicRegistration":false,"resolveSupport":{"properties":["edit","command"]},"dataSupport":true,"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}},"isPreferredSupport":true},"formatting":{"dynamicRegistration":false},"rangeFormatting":{"dynamicRegistration":false},"rename":{"dynamicRegistration":false},"semanticTokens":{"dynamicRegistration":false,"requests":{"quote":{"full":{"delta":true}}},"overlappingTokenSupport":true,"multilineTokenSupport":true,"tokenTypes":["namespace","type","class","enum","interface","struct","typeParameter","parameter","variable","property","enumMember","event","function","method","macro","keyword","modifier","comment","string","number","regexp","operator","decorator"],"tokenModifiers":["declaration","definition","readonly","static","deprecated","abstract","async","modification","documentation","defaultLibrary"],"formats":["relative"]},"inlayHint":{"dynamicRegistration":false},"callHierarchy":{"dynamicRegistration":false},"typeHierarchy":{"dynamicRegistration":false},"diagnostic":{"dynamicRegistration":false},"publishDiagnostics":{"relatedInformation":false,"versionSupport":true,"codeDescriptionSupport":false,"tagSupport":{"valueSet":[1,2]}}},"window":{"showDocument":{"support":true},"showMessage":{"messageActionItem":{"additionalPropertiesSupport":true}},"workDoneProgress":true},"general":{"positionEncodings":["utf-32","utf-8","utf-16"]},"experimental":{}},"workspaceFolders":[{"uri":"file:///home/joao/tmp/rass-repro","name":"~/tmp/rass-repro/"}]}}
[jsonrpc] e[07:53:38.783] <-- window/logMessage {"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"Using Typescript version (workspace) 5.0.4 from path \"/home/joao/tmp/rass-repro/node_modules/typescript/lib/tsserver.js\""}}
[jsonrpc] e[07:53:38.788] <-- initialize[1] {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"textDocumentSync":2,"completionProvider":{"triggerCharacters":[".","\"","'","/","@","<"],"resolveProvider":true},"codeActionProvider":{"codeActionKinds":["source.fixAll.ts","source.removeUnused.ts","source.addMissingImports.ts","quickfix","source.organizeImports.ts","source.removeUnusedImports.ts","source.sortImports.ts","refactor"],"resolveProvider":true},"codeLensProvider":{"resolveProvider":true},"definitionProvider":true,"documentFormattingProvider":true,"documentRangeFormattingProvider":true,"documentHighlightProvider":true,"documentSymbolProvider":true,"executeCommandProvider":{"commands":["_typescript.applyRefactoring","_typescript.configurePlugin","_typescript.organizeImports","_typescript.applyRenameFile","_typescript.goToSourceDefinition","typescript.tsserverRequest","_typescript.applyCodeActionCommand","_typescript.applyFixAllCodeAction"]},"hoverProvider":true,"inlayHintProvider":true,"linkedEditingRangeProvider":false,"renameProvider":true,"referencesProvider":true,"selectionRangeProvider":true,"signatureHelpProvider":{"triggerCharacters":["(",",","<"],"retriggerCharacters":[")"]},"workspaceSymbolProvider":true,"implementationProvider":true,"typeDefinitionProvider":true,"foldingRangeProvider":true,"semanticTokensProvider":{"documentSelector":null,"legend":{"tokenTypes":["class","enum","interface","namespace","typeParameter","type","parameter","variable","enumMember","property","function","member"],"tokenModifiers":["declaration","static","async","readonly","defaultLibrary","local"]},"full":true,"range":true},"workspace":{"fileOperations":{"willRename":{"filters":[{"scheme":"file","pattern":{"glob":"**/*.{ts,js,jsx,tsx,mjs,mts,cjs,cts}","matches":"file"}},{"scheme":"file","pattern":{"glob":"**","matches":"folder"}}]}}},"callHierarchyProvider":true}}}
[jsonrpc] e[07:53:38.789] --> initialized {"jsonrpc":"2.0","method":"initialized","params":{}}
[jsonrpc] e[07:53:38.792] --> textDocument/didOpen {"jsonrpc":"2.0","method":"textDocument/didOpen","params":{"textDocument":{"uri":"file:///home/joao/tmp/rass-repro/src/index.ts","version":0,"languageId":"typescript","text":"const a: string = 2;\n\nasync function foo(n: number) {}\n\nasync function bar() {\n\tfor (const n of [1, 2, 3]) {\n\t\tawait foo(n); // this should throw an eslint error: Unexpected `await` inside a loop. But it does not.\n\t}\n}\n"}}}
[jsonrpc] e[07:53:38.799] --> workspace/didChangeConfiguration {"jsonrpc":"2.0","method":"workspace/didChangeConfiguration","params":{"settings":{":":null,"gopls":{"usePlaceholders":true}}}}
[jsonrpc] e[07:53:38.809] --> textDocument/inlayHint[2] {"jsonrpc":"2.0","id":2,"method":"textDocument/inlayHint","params":{"textDocument":{"uri":"file:///home/joao/tmp/rass-repro/src/index.ts"},"range":{"start":{"line":0,"character":0},"end":{"line":9,"character":0}}}}
[jsonrpc] e[07:53:38.814] <-- $/typescriptVersion {"jsonrpc":"2.0","method":"$/typescriptVersion","params":{"version":"5.0.4","source":"workspace"}}
[jsonrpc] e[07:53:38.814] <-- workspace/configuration[0] {"jsonrpc":"2.0","id":0,"method":"workspace/configuration","params":{"items":[{"scopeUri":"file:///home/joao/tmp/rass-repro/src/index.ts","section":"formattingOptions"}]}}
[jsonrpc] e[07:53:38.816] --> workspace/configuration[0] {"jsonrpc":"2.0","id":0,"result":[null]}
[jsonrpc] e[07:53:38.816] <-- textDocument/inlayHint[2] {"jsonrpc":"2.0","id":2,"result":[]}
[jsonrpc] e[07:53:39.310] <-- window/workDoneProgress/create[1] {"jsonrpc":"2.0","id":1,"method":"window/workDoneProgress/create","params":{"token":"1e645c6b-890f-406e-8dcd-e6461adb6443"}}
[jsonrpc] e[07:53:39.310] --> window/workDoneProgress/create[1] {"jsonrpc":"2.0","id":1,"result":null}
[jsonrpc] e[07:53:39.317] <-- $/progress {"jsonrpc":"2.0","method":"$/progress","params":{"token":"1e645c6b-890f-406e-8dcd-e6461adb6443","value":{"kind":"begin","title":"Initializing JS/TS language features…"}}}
[jsonrpc] e[07:53:40.654] <-- $/progress {"jsonrpc":"2.0","method":"$/progress","params":{"token":"1e645c6b-890f-406e-8dcd-e6461adb6443","value":{"kind":"end"}}}
[jsonrpc] e[07:53:40.813] <-- textDocument/publishDiagnostics {"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/joao/tmp/rass-repro/src/index.ts","diagnostics":[]}}
[jsonrpc] e[07:53:40.908] <-- textDocument/publishDiagnostics {"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/joao/tmp/rass-repro/src/index.ts","diagnostics":[{"range":{"start":{"line":0,"character":6},"end":{"line":0,"character":7}},"message":"Type 'number' is not assignable to type 'string'.","severity":1,"code":2322,"source":"typescript","tags":[]},{"range":{"start":{"line":2,"character":19},"end":{"line":2,"character":20}},"message":"'n' is declared but its value is never read.","severity":4,"code":6133,"source":"typescript","tags":[1]}]}}
[jsonrpc] e[07:53:43.318] <-- textDocument/publishDiagnostics {"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/joao/tmp/rass-repro/src/index.ts","diagnostics":[{"range":{"start":{"line":0,"character":6},"end":{"line":0,"character":7}},"message":"Type 'number' is not assignable to type 'string'.","severity":1,"code":2322,"source":"typescript","tags":[]},{"range":{"start":{"line":2,"character":19},"end":{"line":2,"character":20}},"message":"'n' is declared but its value is never read.","severity":4,"code":6133,"source":"typescript","tags":[1]}]}}
[jsonrpc] e[07:53:44.329] <-- textDocument/publishDiagnostics {"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/joao/tmp/rass-repro/src/index.ts","diagnostics":[{"range":{"start":{"line":0,"character":6},"end":{"line":0,"character":7}},"message":"Type 'number' is not assignable to type 'string'.","severity":1,"code":2322,"source":"typescript","tags":[]},{"range":{"start":{"line":2,"character":19},"end":{"line":2,"character":20}},"message":"'n' is declared but its value is never read.","severity":4,"code":6133,"source":"typescript","tags":[1]}]}}

[yassernasc]

Oh my.. it ended up that "nodenext" is a value for the module field, not target. 🙈

M-x eglot-events-buffer was what I needed to perform sanity checks. Thank you.