Hi @TobiasYin,

First of all, thanks for the great project!

Weirdly enough, I can't get the example working. No errors will be logged, but no feature is working. Even replacing go-lsp handlers with panic does not work. I tried with VS Code and a self-written extension (see details spoiler below).

Do you have some working example code for client and server? No matter for which client editor. Or do you have an idea of what's missing?

const serverOptions: ServerOptions = {
    command: "/path/to/compiled/go-lsp-master/example/main",
    args: [],
    transport: TransportKind.stdio, // also tried every other option
};
const clientOptions: LanguageClientOptions = {
    documentSelector: [
      { scheme: "file", language: "example" },
      { scheme: "file", pattern: "*.example" },
      { scheme: "file", language: "go" }, // to ensure there is no bug in the contributed language definition
      { scheme: "file", pattern: "*.go" },
    ]
   // also tried outputChannel and traceOutputChannel
}
client = new LanguageClient(
    "example",
    "Example Language Server",
    serverOptions,
    clientOptions
  );

client.onReady().then(() => {
    console.log("Example client ready"); // will NOT be logged
});

client.start();

while trying your library I noticed the missing server.Run().

@TobiasYin also: I noticed you didn't pick an open source license, yet. Wether or not I can use this project in production depends on the license you choose.

I am working on setting up a new Language Server for VS Code and am having some troubles with some incoming requests. It may be specific to workspace/* commands. When they are sent, a MethodNotFound response is sent.

The logs look like this:

use stdio mode.
Request: [0] [initialize], content: [{"processId":485172,"clientInfo":{"name":"Visual Studio Code","version":"1.72.2"},"locale":"en-us","rootPath":"path_here","rootUri":"path_here","capabilities":{"workspace":{"applyEdit":true,"workspaceEdit":{"documentChanges":true,"resourceOperations":["create","rename","delete"],"failureHandling":"textOnlyTransactional","normalizesLineEndings":true,"changeAnnotationSupport":{"groupsOnLabel":true}},"configuration":true,"didChangeWatchedFiles":{"dynamicRegistration":true,"relativePatternSupport":true},"symbol":{"dynamicRegistration":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]},"tagSupport":{"valueSet":[1]},"resolveSupport":{"properties":["location.range"]}},"codeLens":{"refreshSupport":true},"executeCommand":{"dynamicRegistration":true},"didChangeConfiguration":{"dynamicRegistration":true},"workspaceFolders":true,"semanticTokens":{"refreshSupport":true},"fileOperations":{"dynamicRegistration":true,"didCreate":true,"didRename":true,"didDelete":true,"willCreate":true,"willRename":true,"willDelete":true},"inlineValue":{"refreshSupport":true},"inlayHint":{"refreshSupport":true},"diagnostics":{"refreshSupport":true}},"textDocument":{"publishDiagnostics":{"relatedInformation":true,"versionSupport":false,"tagSupport":{"valueSet":[1,2]},"codeDescriptionSupport":true,"dataSupport":true},"synchronization":{"dynamicRegistration":true,"willSave":true,"willSaveWaitUntil":true,"didSave":true},"completion":{"dynamicRegistration":true,"contextSupport":true,"completionItem":{"snippetSupport":true,"commitCharactersSupport":true,"documentationFormat":["markdown","plaintext"],"deprecatedSupport":true,"preselectSupport":true,"tagSupport":{"valueSet":[1]},"insertReplaceSupport":true,"resolveSupport":{"properties":["documentation","detail","additionalTextEdits"]},"insertTextModeSupport":{"valueSet":[1,2]},"labelDetailsSupport":true},"insertTextMode":2,"completionItemKind":{"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]},"completionList":{"itemDefaults":["commitCharacters","editRange","insertTextFormat","insertTextMode"]}},"hover":{"dynamicRegistration":true,"contentFormat":["markdown","plaintext"]},"signatureHelp":{"dynamicRegistration":true,"signatureInformation":{"documentationFormat":["markdown","plaintext"],"parameterInformation":{"labelOffsetSupport":true},"activeParameterSupport":true},"contextSupport":true},"definition":{"dynamicRegistration":true,"linkSupport":true},"references":{"dynamicRegistration":true},"documentHighlight":{"dynamicRegistration":true},"documentSymbol":{"dynamicRegistration":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]},"hierarchicalDocumentSymbolSupport":true,"tagSupport":{"valueSet":[1]},"labelSupport":true},"codeAction":{"dynamicRegistration":true,"isPreferredSupport":true,"disabledSupport":true,"dataSupport":true,"resolveSupport":{"properties":["edit"]},"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}},"honorsChangeAnnotations":false},"codeLens":{"dynamicRegistration":true},"formatting":{"dynamicRegistration":true},"rangeFormatting":{"dynamicRegistration":true},"onTypeFormatting":{"dynamicRegistration":true},"rename":{"dynamicRegistration":true,"prepareSupport":true,"prepareSupportDefaultBehavior":1,"honorsChangeAnnotations":true},"documentLink":{"dynamicRegistration":true,"tooltipSupport":true},"typeDefinition":{"dynamicRegistration":true,"linkSupport":true},"implementation":{"dynamicRegistration":true,"linkSupport":true},"colorProvider":{"dynamicRegistration":true},"foldingRange":{"dynamicRegistration":true,"rangeLimit":5000,"lineFoldingOnly":true,"foldingRangeKind":{"valueSet":["comment","imports","region"]},"foldingRange":{"collapsedText":false}},"declaration":{"dynamicRegistration":true,"linkSupport":true},"selectionRange":{"dynamicRegistration":true},"callHierarchy":{"dynamicRegistration":true},"semanticTokens":{"dynamicRegistration":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"],"requests":{"range":true,"full":{"delta":true}},"multilineTokenSupport":false,"overlappingTokenSupport":false,"serverCancelSupport":true,"augmentsSyntaxTokens":true},"linkedEditingRange":{"dynamicRegistration":true},"typeHierarchy":{"dynamicRegistration":true},"inlineValue":{"dynamicRegistration":true},"inlayHint":{"dynamicRegistration":true,"resolveSupport":{"properties":["tooltip","textEdits","label.tooltip","label.location","label.command"]}},"diagnostic":{"dynamicRegistration":true,"relatedDocumentSupport":false}},"window":{"showMessage":{"messageActionItem":{"additionalPropertiesSupport":true}},"showDocument":{"support":true},"workDoneProgress":true},"general":{"staleRequestSupport":{"cancel":true,"retryOnContentModified":["textDocument/semanticTokens/full","textDocument/semanticTokens/range","textDocument/semanticTokens/full/delta"]},"regularExpressions":{"engine":"ECMAScript","version":"ES2020"},"markdown":{"parser":"marked","version":"1.1.0"},"positionEncodings":["utf-16"]},"notebookDocument":{"synchronization":{"dynamicRegistration":true,"executionSummarySupport":true}}},"trace":"off","workspaceFolders":[{"uri":"path_here","name":"legv8_examples"}]}]
Response: [0] res: [{"jsonrpc":"","id":0,"result":{"capabilities":{"hoverProvider":true}},"error":null}]
Request: [<nil>] [initialized], content: [{}]
Request: [<nil>] [workspace/didChangeConfiguration], content: [{"settings":{}}]
Response: [<nil>] res: [{"jsonrpc":"","id":null,"result":null,"error":{"code":-32601,"message":"MethodNotFound","data":null}}]
Request: [<nil>] [workspace/didChangeWatchedFiles], content: [{"changes":[{"uri":"path_here","type":2}]}]
Response: [<nil>] res: [{"jsonrpc":"","id":null,"result":null,"error":{"code":-32601,"message":"MethodNotFound","data":null}}]

And the simplified logic of what I have running is this:

func main() {

	server := lsp.NewServer(&lsp.Options{CompletionProvider: &defines.CompletionOptions{
		TriggerCharacters: &[]string{"."},
	}})

	server.OnHover(func(ctx context.Context, req *defines.HoverParams) (result *defines.Hover, err error) {
		logs.Println("hover: ", req)
		file, err := ReadFile(req.TextDocument.Uri)
		if err != nil {
			logs.Println("hover: failed to read req.TextDocument.Uri" + err.Error())
		}

		w := getWord(file[req.Position.Line], int(req.Position.Character))
		token := definitions.Tokens[w]

		if token.Name == "" {
			return &defines.Hover{Contents: defines.MarkupContent{Kind: defines.MarkupKindMarkdown, Value: "#### Unknown Token"}}, nil
		}

		return &defines.Hover{Contents: defines.MarkupContent{Kind: defines.MarkupKindMarkdown, Value: "### " + token.Name + "\n" + token.Description}}, nil
	})

	server.OnDidChangeWatchedFiles(func(ctx context.Context, req *defines.DidChangeWatchedFilesParams) (err error) {
		logs.Println("test")
		return nil
	})

	server.OnInitialized(func(ctx context.Context, req *defines.InitializeParams) (err error) {
		return nil
	})

	server.OnDidChangeConfiguration(func(ctx context.Context, req *defines.DidChangeConfigurationParams) (err error) {
		logs.Println("invoked OnDidChangeConfiguration")
		return nil
	})

	server.OnInitialize(func(ctx context.Context, req *defines.InitializeParams) (result *defines.InitializeResult, err *defines.InitializeError) {
		logs.Println("initialized")
		s := &defines.InitializeResult{}
		s.Capabilities.HoverProvider = true
		s.Capabilities.WorkspaceSymbolProvider = true
		s.Capabilities.DocumentFormattingProvider = true
		return s, nil
	})

	server.Run()
}

In theory, shouldn't the server.OnDidChangeWatchedFiles be called when the workspace/didChangeWatchedFiles request comes in?