LSP: Autoimports panic on text completion (just typing)

[lukpsaxo]

Stack trace

panic handling request textDocument/completion runtime error: invalid memory address or nil pointer dereference goroutine 369150 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:26 +0x5e
github.com/microsoft/typescript-go/internal/lsp.(*Server).recover(0xc00016cdc0, 0xc105d34c60)
	github.com/microsoft/typescript-go/internal/lsp/server.go:532 +0x58
panic({0x7ff7e254db60?, 0x7ff7e2fc9ad0?})
	runtime/panic.go:783 +0x132
github.com/microsoft/typescript-go/internal/ls.tryUseExistingNamespaceImport({0xc01ef7f5f0, 0x1, 0xc040846008?}, {0xf1ae6000?, 0xc1?})
	github.com/microsoft/typescript-go/internal/ls/autoimports.go:868 +0x1b5
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).getImportFixes(0xc07b392a08, 0xc040846008, {0xc1c8d689e0, 0x2, 0x2}, 0xc0b593b4a0, 0xc0272bc957, 0xc0272bc956, 0xc23c37eb08, {0xc01be62c40, ...}, ...)
	github.com/microsoft/typescript-go/internal/ls/autoimports.go:628 +0xfe
github.com/microsoft/typescript-go/internal/ls.(*importSpecifierResolverForCompletions).getModuleSpecifierForBestExportInfo(0xc0272bdc30, 0xc040846008, {0xc1c8d689e0, 0x2?, 0xc0272bcb78?}, 0x836, 0x0)
	github.com/microsoft/typescript-go/internal/ls/autoimports.go:552 +0x270
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).getCompletionData.func9.1({0xc1c8d689e0?, 0x43?, 0xc1e20ad8c8?}, {0xc1d666a470, 0x11}, 0x78?, {{0xc1d666a470, 0x11}, 0x136e, {0x0, ...}, ...})
	github.com/microsoft/typescript-go/internal/ls/completions.go:1220 +0x11f
github.com/microsoft/typescript-go/internal/ls.(*exportInfoMap).search(0xc0272bd090, 0xc040846008, {0xc1fa1b0540?, 0x7ff7e1e8637f?}, 0x0, 0xc0272bd1f8, 0xc0272bd338)
	github.com/microsoft/typescript-go/internal/ls/autoimports.go:237 +0x30e
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).searchExportInfosForCompletions(0xc07b392a08, {0x7ff7e28a59d0, 0xc007ae3630}, 0xc040846008, 0xc23c37eb08, 0xc0e19eacf0, 0x0, 0x0, 0x0, {0xc218079835, ...}, ...)
	github.com/microsoft/typescript-go/internal/ls/autoimportsexportinfo.go:172 +0x3da
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).getCompletionData.func9()
	github.com/microsoft/typescript-go/internal/ls/completions.go:1271 +0x26c
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).getCompletionData.func17()
	github.com/microsoft/typescript-go/internal/ls/completions.go:1686 +0x5f6
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).getCompletionData.func18(...)
	github.com/microsoft/typescript-go/internal/ls/completions.go:1713
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).getCompletionData(0xc07b392a08, {0x7ff7e28a59d0, 0xc007ae3630}, 0xc040846008, 0xc23c37eb08, 0x836, 0xc0e19eacf0)
	github.com/microsoft/typescript-go/internal/ls/completions.go:1741 +0x1ee2
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).getCompletionsAtPosition(0xc07b392a08, {0x7ff7e28a59d0, 0xc007ae3630}, 0xc23c37eb08, 0x836, 0x0, 0xc0e19eacf0, 0xc0001fef60)
	github.com/microsoft/typescript-go/internal/ls/completions.go:399 +0x2dd
github.com/microsoft/typescript-go/internal/ls.(*LanguageService).ProvideCompletion(0xc07b392a08, {0x7ff7e28a59d0, 0xc007ae3630}, {0xc020f4df10?, 0xc1da07fe70?}, {0xe244bd8b?, 0x7ff7?}, 0xc0ba1af980, 0xc0001fef60, 0xc0e19eacf0)
	github.com/microsoft/typescript-go/internal/ls/completions.go:50 +0xe7
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleCompletion(0xc0003501c0?, {0x7ff7e28a59d0, 0xc007ae3630}, 0xc07b392a08, 0xc105d34a50)
	github.com/microsoft/typescript-go/internal/lsp/server.go:754 +0xff
github.com/microsoft/typescript-go/internal/lsp.init.func1.registerLanguageServiceDocumentRequestHandler[...].15({0x7ff7e28a59d0, 0xc007ae3630}, 0xc105d34c60)
	github.com/microsoft/typescript-go/internal/lsp/server.go:518 +0x130
github.com/microsoft/typescript-go/internal/lsp.(*Server).handleRequestOrNotification(0xc00016cdc0, {0x7ff7e28a59d0, 0xc007ae3630}, 0xc105d34c60)
	github.com/microsoft/typescript-go/internal/lsp/server.go:424 +0x10d
github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop.func1()
	github.com/microsoft/typescript-go/internal/lsp/server.go:329 +0x3a
created by github.com/microsoft/typescript-go/internal/lsp.(*Server).dispatchLoop in goroutine 23
	github.com/microsoft/typescript-go/internal/lsp/server.go:349 +0x8aa

[Error - 11:21:54 AM] Request textDocument/completion failed.
  Message: InternalError: panic handling request textDocument/completion: runtime error: invalid memory address or nil pointer dereference
  Code: -32603 

Steps to reproduce

Sorry, will keep an eye out but it seems to happen regularly just editing files.

[lukpsaxo]

Possibly a duplicate of #1658 but that has no stack trace in it and I don't remember deleting any import statements

[iisaduan]

I think I know the issue, but if you could give an example of a repo, it would be helpful as a test case to make sure it's fixed