textDocument/inlayHint: Cannot create token from reparsed node of kind KindFunctionExpression

[rubnogueira]

Stack trace

2026-01-09 15:46:16.074 [info] 
Project '/dev/null/inferred'
	Files (2314)
-----------------------------------------------
2026-01-09 15:46:16.074 [info] 
======== Cache Statistics ========
2026-01-09 15:46:16.074 [info] Open file count:       16
2026-01-09 15:46:16.075 [info] Cached disk files:  20682
2026-01-09 15:46:16.075 [info] Project count:         11
2026-01-09 15:46:16.075 [info] Config count:          20
2026-01-09 15:46:16.075 [info] 
2026-01-09 15:46:16.293 [error] panic handling request textDocument/inlayHint: Cannot create token from reparsed node of kind KindFunctionExpression
goroutine 1374992 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:26 +0x64
github.com/microsoft/typescript-go/internal/lsp.(*Server).recover(0x14000234008, 0x142311fe660)
	github.com/microsoft/typescript-go/internal/lsp/server.go:701 +0x40
panic({0x1037aabe0?, 0x141c06094d0?})
	runtime/panic.go:783 +0x120
github.com/microsoft/typescript-go/internal/ast.(*SourceFile).GetOrCreateToken(0x141f9a39808, 0x63, 0xdfe, 0xe07, 0x1407e8bdc30, 0x0)
	github.com/microsoft/typescript-go/internal/ast/ast.go:11017 +0x280
github.com/microsoft/typescript-go/internal/astnav.FindChildOfKind.func1(0x140de0ee558)
	github.com/microsoft/typescript-go/internal/astnav/tokens.go:738 +0xd4
github.com/microsoft/typescript-go/internal/ast.visitNodes(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:29
github.com/microsoft/typescript-go/internal/ast.visitNodeList(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:38
github.com/microsoft/typescript-go/internal/ast.(*FunctionExpression).ForEachChild(0x1407e8bdc30, 0x141c9358b00)
	github.com/microsoft/typescript-go/internal/ast/ast.go:6541 +0x1dc
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ast.ForEachChildAndJSDoc(0x141f9a39808?, 0xdfe?, 0x1033bb340?)
	github.com/microsoft/typescript-go/internal/ast/utilities.go:2871 +0x44
github.com/microsoft/typescript-go/internal/astnav.FindChildOfKind(0x1407e8bdc30, 0x15, 0x141f9a39808)
	github.com/microsoft/typescript-go/internal/astnav/tokens.go:756 +0xdc
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).getTypeAnnotationPosition(0x1410e77f440?, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:909 +0x2c
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visitFunctionDeclarationLikeForReturnType(0x1410e77f440, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:139 +0x154
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x1410e77f440, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:101 +0x334
github.com/microsoft/typescript-go/internal/ast.visit(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:22
github.com/microsoft/typescript-go/internal/ast.(*ExportAssignment).ForEachChild(0x142146358c0, 0x141c0609390)
	github.com/microsoft/typescript-go/internal/ast/ast.go:5157 +0xa0
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x1410e77f440, 0x142146358c0)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:104 +0x390
github.com/microsoft/typescript-go/internal/ast.visitNodes(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:29
github.com/microsoft/typescript-go/internal/ast.visitNodeList(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:38
github.com/microsoft/typescript-go/internal/ast.(*SourceFile).ForEachChild(0x141f9a39808, 0x141c02b9270)
	github.com/microsoft/typescript-go/internal/ast/ast.go:10882 +0xa4
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x1410e77f440, 0x141f9a39808)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:104 +0x390
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).ProvideInlayHint(0x1423cb82b10, {0x1039f7de8, 0x1423cb82ab0}, 0x142311fe630)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:48 +0x2a4
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleInlayHint(0x14089fb1ee8?, {0x1039f7de8?, 0x1423cb82ab0?}, 0x14221612e70?, 0x14089fb1ea8?)
	github.com/microsoft/typescript-go/internal/lsp/server.go:1094 +0x2c
github.com/microsoft/typescript-go/internal/lsp.init.func1.registerLanguageServiceDocumentRequestHandler[...].24({0x1039f7de8, 0x1423cb82ab0}, 0x142311fe660)
	github.com/microsoft/typescript-go/internal/lsp/server.go:617 +0xe0
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleRequestOrNotification(0x14000234008, {0x1039f7e20?, 0x14222b37860?}, 0x142311fe660)
	github.com/microsoft/typescript-go/internal/lsp/server.go:501 +0x128
github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop.func1()
	github.com/microsoft/typescript-go/internal/lsp/server.go:404 +0x34
created by github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop in goroutine 9
	github.com/microsoft/typescript-go/internal/lsp/server.go:424 +0x7a0

2026-01-09 15:46:16.297 [error] Request textDocument/inlayHint failed.
  Message: InternalError: panic handling request textDocument/inlayHint: Cannot create token from reparsed node of kind KindFunctionExpression
  Code: -32603 
2026-01-09 15:46:16.304 [error] panic handling request textDocument/inlayHint: Cannot create token from reparsed node of kind KindFunctionExpression
goroutine 1374986 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:26 +0x64
github.com/microsoft/typescript-go/internal/lsp.(*Server).recover(0x14000234008, 0x14222e7e390)
	github.com/microsoft/typescript-go/internal/lsp/server.go:701 +0x40
panic({0x1037aabe0?, 0x141c5eb4bd0?})
	runtime/panic.go:783 +0x120
github.com/microsoft/typescript-go/internal/ast.(*SourceFile).GetOrCreateToken(0x141f9a39808, 0x63, 0xdfe, 0xe07, 0x1407e8bdc30, 0x0)
	github.com/microsoft/typescript-go/internal/ast/ast.go:11017 +0x280
github.com/microsoft/typescript-go/internal/astnav.FindChildOfKind.func1(0x140de0ee558)
	github.com/microsoft/typescript-go/internal/astnav/tokens.go:738 +0xd4
github.com/microsoft/typescript-go/internal/ast.visitNodes(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:29
github.com/microsoft/typescript-go/internal/ast.visitNodeList(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:38
github.com/microsoft/typescript-go/internal/ast.(*FunctionExpression).ForEachChild(0x1407e8bdc30, 0x1408552d300)
	github.com/microsoft/typescript-go/internal/ast/ast.go:6541 +0x1dc
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ast.ForEachChildAndJSDoc(0x141f9a39808?, 0xdfe?, 0x1033bb340?)
	github.com/microsoft/typescript-go/internal/ast/utilities.go:2871 +0x44
github.com/microsoft/typescript-go/internal/astnav.FindChildOfKind(0x1407e8bdc30, 0x15, 0x141f9a39808)
	github.com/microsoft/typescript-go/internal/astnav/tokens.go:756 +0xdc
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).getTypeAnnotationPosition(0x14016857c80?, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:909 +0x2c
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visitFunctionDeclarationLikeForReturnType(0x14016857c80, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:139 +0x154
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x14016857c80, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:101 +0x334
github.com/microsoft/typescript-go/internal/ast.visit(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:22
github.com/microsoft/typescript-go/internal/ast.(*ExportAssignment).ForEachChild(0x142146358c0, 0x141c5eb4ae0)
	github.com/microsoft/typescript-go/internal/ast/ast.go:5157 +0xa0
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x14016857c80, 0x142146358c0)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:104 +0x390
github.com/microsoft/typescript-go/internal/ast.visitNodes(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:29
github.com/microsoft/typescript-go/internal/ast.visitNodeList(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:38
github.com/microsoft/typescript-go/internal/ast.(*SourceFile).ForEachChild(0x141f9a39808, 0x141c5a58e80)
	github.com/microsoft/typescript-go/internal/ast/ast.go:10882 +0xa4
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x14016857c80, 0x141f9a39808)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:104 +0x390
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).ProvideInlayHint(0x141a99521b0, {0x1039f7de8, 0x141a9952150}, 0x14222e7e360)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:48 +0x2a4
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleInlayHint(0x14210fc9ee8?, {0x1039f7de8?, 0x141a9952150?}, 0x14221612e70?, 0x14210fc9ea8?)
	github.com/microsoft/typescript-go/internal/lsp/server.go:1094 +0x2c
github.com/microsoft/typescript-go/internal/lsp.init.func1.registerLanguageServiceDocumentRequestHandler[...].24({0x1039f7de8, 0x141a9952150}, 0x14222e7e390)
	github.com/microsoft/typescript-go/internal/lsp/server.go:617 +0xe0
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleRequestOrNotification(0x14000234008, {0x1039f7e20?, 0x14222b37680?}, 0x14222e7e390)
	github.com/microsoft/typescript-go/internal/lsp/server.go:501 +0x128
github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop.func1()
	github.com/microsoft/typescript-go/internal/lsp/server.go:404 +0x34
created by github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop in goroutine 9
	github.com/microsoft/typescript-go/internal/lsp/server.go:424 +0x7a0

2026-01-09 15:46:16.306 [error] Request textDocument/inlayHint failed.
  Message: InternalError: panic handling request textDocument/inlayHint: Cannot create token from reparsed node of kind KindFunctionExpression
  Code: -32603 
2026-01-09 15:46:16.310 [error] panic handling request textDocument/inlayHint: Cannot create token from reparsed node of kind KindFunctionExpression
goroutine 1374978 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:26 +0x64
github.com/microsoft/typescript-go/internal/lsp.(*Server).recover(0x14000234008, 0x1420a2e0870)
	github.com/microsoft/typescript-go/internal/lsp/server.go:701 +0x40
panic({0x1037aabe0?, 0x141c6205930?})
	runtime/panic.go:783 +0x120
github.com/microsoft/typescript-go/internal/ast.(*SourceFile).GetOrCreateToken(0x141f9a39808, 0x63, 0xdfe, 0xe07, 0x1407e8bdc30, 0x0)
	github.com/microsoft/typescript-go/internal/ast/ast.go:11017 +0x280
github.com/microsoft/typescript-go/internal/astnav.FindChildOfKind.func1(0x140de0ee558)
	github.com/microsoft/typescript-go/internal/astnav/tokens.go:738 +0xd4
github.com/microsoft/typescript-go/internal/ast.visitNodes(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:29
github.com/microsoft/typescript-go/internal/ast.visitNodeList(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:38
github.com/microsoft/typescript-go/internal/ast.(*FunctionExpression).ForEachChild(0x1407e8bdc30, 0x1402e617100)
	github.com/microsoft/typescript-go/internal/ast/ast.go:6541 +0x1dc
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ast.ForEachChildAndJSDoc(0x141f9a39808?, 0xdfe?, 0x1033bb340?)
	github.com/microsoft/typescript-go/internal/ast/utilities.go:2871 +0x44
github.com/microsoft/typescript-go/internal/astnav.FindChildOfKind(0x1407e8bdc30, 0x15, 0x141f9a39808)
	github.com/microsoft/typescript-go/internal/astnav/tokens.go:756 +0xdc
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).getTypeAnnotationPosition(0x14078d858c0?, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:909 +0x2c
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visitFunctionDeclarationLikeForReturnType(0x14078d858c0, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:139 +0x154
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x14078d858c0, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:101 +0x334
github.com/microsoft/typescript-go/internal/ast.visit(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:22
github.com/microsoft/typescript-go/internal/ast.(*ExportAssignment).ForEachChild(0x142146358c0, 0x141c6205790)
	github.com/microsoft/typescript-go/internal/ast/ast.go:5157 +0xa0
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x14078d858c0, 0x142146358c0)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:104 +0x390
github.com/microsoft/typescript-go/internal/ast.visitNodes(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:29
github.com/microsoft/typescript-go/internal/ast.visitNodeList(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:38
github.com/microsoft/typescript-go/internal/ast.(*SourceFile).ForEachChild(0x141f9a39808, 0x141c5f0fd70)
	github.com/microsoft/typescript-go/internal/ast/ast.go:10882 +0xa4
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x14078d858c0, 0x141f9a39808)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:104 +0x390
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).ProvideInlayHint(0x141a9952c00, {0x1039f7de8, 0x141a9952ba0}, 0x1420a2e0840)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:48 +0x2a4
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleInlayHint(0x14210ef0ee8?, {0x1039f7de8?, 0x141a9952ba0?}, 0x1420a2e6070?, 0x14210ef0ea8?)
	github.com/microsoft/typescript-go/internal/lsp/server.go:1094 +0x2c
github.com/microsoft/typescript-go/internal/lsp.init.func1.registerLanguageServiceDocumentRequestHandler[...].24({0x1039f7de8, 0x141a9952ba0}, 0x1420a2e0870)
	github.com/microsoft/typescript-go/internal/lsp/server.go:617 +0xe0
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleRequestOrNotification(0x14000234008, {0x1039f7e20?, 0x14222b37400?}, 0x1420a2e0870)
	github.com/microsoft/typescript-go/internal/lsp/server.go:501 +0x128
github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop.func1()
	github.com/microsoft/typescript-go/internal/lsp/server.go:404 +0x34
created by github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop in goroutine 9
	github.com/microsoft/typescript-go/internal/lsp/server.go:424 +0x7a0

2026-01-09 15:46:16.311 [error] Request textDocument/inlayHint failed.
  Message: InternalError: panic handling request textDocument/inlayHint: Cannot create token from reparsed node of kind KindFunctionExpression
  Code: -32603 
2026-01-09 15:46:16.607 [info] Updated watches in 545.607ms
2026-01-09 15:46:20.391 [error] panic handling request textDocument/inlayHint: Cannot create token from reparsed node of kind KindFunctionExpression
goroutine 1374262 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:26 +0x64
github.com/microsoft/typescript-go/internal/lsp.(*Server).recover(0x14000234008, 0x1416a0097d0)
	github.com/microsoft/typescript-go/internal/lsp/server.go:701 +0x40
panic({0x1037aabe0?, 0x140b8604300?})
	runtime/panic.go:783 +0x120
github.com/microsoft/typescript-go/internal/ast.(*SourceFile).GetOrCreateToken(0x141f9a39808, 0x63, 0xdfe, 0xe07, 0x1407e8bdc30, 0x0)
	github.com/microsoft/typescript-go/internal/ast/ast.go:11017 +0x280
github.com/microsoft/typescript-go/internal/astnav.FindChildOfKind.func1(0x140de0ee558)
	github.com/microsoft/typescript-go/internal/astnav/tokens.go:738 +0xd4
github.com/microsoft/typescript-go/internal/ast.visitNodes(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:29
github.com/microsoft/typescript-go/internal/ast.visitNodeList(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:38
github.com/microsoft/typescript-go/internal/ast.(*FunctionExpression).ForEachChild(0x1407e8bdc30, 0x1409f90a980)
	github.com/microsoft/typescript-go/internal/ast/ast.go:6541 +0x1dc
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ast.ForEachChildAndJSDoc(0x141f9a39808?, 0xdfe?, 0x1033bb340?)
	github.com/microsoft/typescript-go/internal/ast/utilities.go:2871 +0x44
github.com/microsoft/typescript-go/internal/astnav.FindChildOfKind(0x1407e8bdc30, 0x15, 0x141f9a39808)
	github.com/microsoft/typescript-go/internal/astnav/tokens.go:756 +0xdc
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).getTypeAnnotationPosition(0x140b52537a0?, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:909 +0x2c
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visitFunctionDeclarationLikeForReturnType(0x140b52537a0, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:139 +0x154
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x140b52537a0, 0x1407e8bdc30)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:101 +0x334
github.com/microsoft/typescript-go/internal/ast.visit(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:22
github.com/microsoft/typescript-go/internal/ast.(*ExportAssignment).ForEachChild(0x142146358c0, 0x140b8604220)
	github.com/microsoft/typescript-go/internal/ast/ast.go:5157 +0xa0
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x140b52537a0, 0x142146358c0)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:104 +0x390
github.com/microsoft/typescript-go/internal/ast.visitNodes(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:29
github.com/microsoft/typescript-go/internal/ast.visitNodeList(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:38
github.com/microsoft/typescript-go/internal/ast.(*SourceFile).ForEachChild(0x141f9a39808, 0x141c88d1aa0)
	github.com/microsoft/typescript-go/internal/ast/ast.go:10882 +0xa4
github.com/microsoft/typescript-go/internal/ast.(*Node).ForEachChild(...)
	github.com/microsoft/typescript-go/internal/ast/ast.go:243
github.com/microsoft/typescript-go/internal/ls.(*inlayHintState).visit(0x140b52537a0, 0x141f9a39808)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:104 +0x390
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).ProvideInlayHint(0x14169f7f320, {0x1039f7de8, 0x14169f7f290}, 0x1416a0097a0)
	github.com/microsoft/typescript-go/internal/ls/inlay_hints.go:48 +0x2a4
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleInlayHint(0x141c3f8eee8?, {0x1039f7de8?, 0x14169f7f290?}, 0x1416e893b90?, 0x141c3f8eea8?)
	github.com/microsoft/typescript-go/internal/lsp/server.go:1094 +0x2c
github.com/microsoft/typescript-go/internal/lsp.init.func1.registerLanguageServiceDocumentRequestHandler[...].24({0x1039f7de8, 0x14169f7f290}, 0x1416a0097d0)
	github.com/microsoft/typescript-go/internal/lsp/server.go:617 +0xe0
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleRequestOrNotification(0x14000234008, {0x1039f7e20?, 0x1405313e9b0?}, 0x1416a0097d0)
	github.com/microsoft/typescript-go/internal/lsp/server.go:501 +0x128
github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop.func1()
	github.com/microsoft/typescript-go/internal/lsp/server.go:404 +0x34
created by github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop in goroutine 9
	github.com/microsoft/typescript-go/internal/lsp/server.go:424 +0x7a0

2026-01-09 15:46:20.391 [error] Request textDocument/inlayHint failed.
  Message: InternalError: panic handling request textDocument/inlayHint: Cannot create token from reparsed node of kind KindFunctionExpression
  Code: -32603 

Steps to reproduce

1. I opened a .js file

version:
0.20260109.1

[jakebailey]

Do you have a repro we can test?

[a-tarasyuk]

@jakebailey minimal repro

package fourslash_test

import (
	"testing"

	"github.com/microsoft/typescript-go/internal/fourslash"
	"github.com/microsoft/typescript-go/internal/ls/lsutil"
	"github.com/microsoft/typescript-go/internal/testutil"
)

func TestInlayHintsCrash(t *testing.T) {
	t.Parallel()

	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
	const content = `
// @allowJs: true
// @checkJs: true

// @Filename: /a.js
module.exports = function () {
  return 1;
};
`

	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
	defer done()
	f.VerifyBaselineInlayHints(t, nil /*span*/, &lsutil.UserPreferences{InlayHints: lsutil.InlayHintsPreferences{
		IncludeInlayFunctionLikeReturnTypeHints: true,
		IncludeInlayFunctionParameterTypeHints:  true,
	}})
}

[rubnogueira]

@jakebailey please let me know if @a-tarasyuk repro is enough to check, or if you want me to try to create a repro.

I'm also getting this sometimes when I open a js file:

Request textDocument/inlayHint failed. Message: no project found for URI file:///Users/project/src/folder/file.js Code: -32603

2026-01-09 18:15:27.095 [info] Updated watches in 11.125µs
2026-01-09 18:15:27.095 [info] Delaying scheduled diagnostics refresh...
2026-01-09 18:15:27.096 [error] Request textDocument/inlayHint failed.
  Message: no project found for URI file:///Users/project/src/folder/file.js
  Code: -32603 
2026-01-09 18:15:27.096 [info] ======== Cloning snapshot 729 ========
[18:15:26.991] Reason: RequestedLanguageService (file not open) -  Documents: [file:///Users/project/src/folder/file.js]
[18:15:26.991] DidRequestFile
	[18:15:26.991] computeConfigFileName:: File: /Users/project/src/folder/file.js:: Result: /Users/project/tsconfig.json
	[18:15:26.991] Searching for default configured project for /Users/project/src/folder/file.js

Edit: created #2572

[rubnogueira]

Just noticed today, feedback if it's relevant: I still have a project that uses grunt, and it has a "Gruntfile.js" in the same folder level as the tsconfig.json. As soon as I open that file, this crash happens.

'use strict';

const jsdom = require('jsdom');
const crypto = require('crypto');
const path = require('path');

module.exports = function(grunt) {
  // Load grunt tasks automatically
  require('load-grunt-tasks')(grunt);

};

The moment I click the line of the last "require", this shows up.

[rubnogueira]

https://github.com/rubnogueira/tsgo-repro-2460

I just created a repro. It's super easy to trigger this alert. You just need to open the Gruntfile.js file.

Tested against the last commit 5c96b7eecdb2c42768b8114ae5d00019b8465411.