{"record":{"id":"dece60eee041ba05","repo":"microsoft/typescript-go","slug":"w-invalid-parameter-index","errorCode":null,"errorMessage":"%w: invalid parameter index","messagePattern":"%w: invalid parameter index","errorType":"validation","errorClass":"ErrClientError","httpStatus":null,"severity":"error","filePath":"internal/api/session.go","lineNumber":2289,"sourceCode":"\n\treturn setup.newTypeResponse(setup.checker.GetWidenedType(t)), nil\n}\n\n// handleGetParameterType returns the type of a parameter at a given index in a signature.\nfunc (s *Session) handleGetParameterType(ctx context.Context, params *GetParameterTypeParams) (*TypeResponse, error) {\n\tsetup, err := s.setupChecker(ctx, params.Snapshot, params.Project)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\tdefer setup.done()\n\n\tsig, err := setup.resolveSignatureHandle(params.Signature)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\tif params.Index < 0 {\n\t\treturn nil, fmt.Errorf(\"%w: invalid parameter index\", ErrClientError)\n\t}\n\n\treturn setup.newTypeResponse(setup.checker.GetTypeAtPosition(sig, int(params.Index))), nil\n}\n\nfunc (s *Session) handleGetTypeParameterAtPosition(ctx context.Context, params *GetParameterTypeParams) (*TypeResponse, error) {\n\tsetup, err := s.setupChecker(ctx, params.Snapshot, params.Project)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\tdefer setup.done()\n\n\tsig, err := setup.resolveSignatureHandle(params.Signature)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\tif params.Index < 0 {\n\t\treturn nil, fmt.Errorf(\"%w: invalid parameter index\", ErrClientError)","sourceCodeStart":2271,"sourceCodeEnd":2307,"githubUrl":"https://github.com/microsoft/typescript-go/blob/1bcfa18d79a3be41772223d5c05dfe4480e614ff/internal/api/session.go#L2271-L2307","documentation":"Error \"%w: invalid parameter index\" thrown in microsoft/typescript-go.","triggerScenarios":"Thrown at internal/api/session.go:2289 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"1bcfa18d79a3be41772223d5c05dfe4480e614ff","analyzedAt":"2026-08-16T02:12:00.115Z","schemaVersion":2},"datasetVersion":"2026-08-16T03:17:38.424Z"}