[Panic Report] : panic: module symbol has no non-augmentation declaration

[christophe-g]

Stack trace

026-01-11 18:05:48.944 [info] Updated watches in 314.539034ms
2026-01-11 18:05:49.002 [error] panic: module symbol has no non-augmentation declaration
2026-01-11 18:05:49.002 [error] 
2026-01-11 18:05:49.002 [error] goroutine 47348 [running]:
2026-01-11 18:05:49.002 [error] github.com/microsoft/typescript-go/internal/ls/autoimport.getModuleIDAndFileNameOfModuleSymbol(0xc30f00?)
2026-01-11 18:05:49.002 [error] 	github.com/microsoft/typescript-go/internal/ls/autoimport/util.go:29 +0x185
2026-01-11 18:05:49.002 [error] github.com/microsoft/typescript-go/internal/ls/autoimport.(*symbolExtractor).getModuleIDForSymbol(0xc04a449cc0, 0xc0494cc768)
2026-01-11 18:05:49.002 [error] 	github.com/microsoft/typescript-go/internal/ls/autoimport/extract.go:94 +0x25
2026-01-11 18:05:49.002 [error] github.com/microsoft/typescript-go/internal/ls/autoimport.(*symbolExtractor).createExport(0xc04a449cc0, 0xc0494be238, {0xc0326e4d90, 0x6c}, {0xc0326e4d90, 0x6c}, 0x2, 0xc049b4c7b0?, 0xc041831aa0)
2026-01-11 18:05:49.002 [error] 	github.com/microsoft/typescript-go/internal/ls/autoimport/extract.go:325 +0x559
2026-01-11 18:05:49.002 [error] github.com/microsoft/typescript-go/internal/ls/autoimport.(*symbolExtractor).extractFromSymbol(0xc04a449cc0, {0xc0490001bd, 0x11}, 0xc0494be238, {0xc0326e4d90, 0x6c}, {0xc0326e4d90, 0x6c}, 0xc046672c08, 0xc041831ba0)
2026-01-11 18:05:49.002 [error] 	github.com/microsoft/typescript-go/internal/ls/autoimport/extract.go:206 +0x1e9
2026-01-11 18:05:49.002 [error] github.com/microsoft/typescript-go/internal/ls/autoimport.(*exportExtractor).extractFromModule(0xc041831f88, 0xc046672c08)
2026-01-11 18:05:49.002 [error] 	github.com/microsoft/typescript-go/internal/ls/autoimport/extract.go:139 +0x2fb
2026-01-11 18:05:49.002 [error] github.com/microsoft/typescript-go/internal/ls/autoimport.(*exportExtractor).extractFromFile(0x10eff68?, 0xc04885cc00?)
2026-01-11 18:05:49.002 [error] 	github.com/microsoft/typescript-go/internal/ls/autoimport/extract.go:107 +0x85
2026-01-11 18:05:49.002 [error] github.com/microsoft/typescript-go/internal/ls/autoimport.(*registryBuilder).extractPackages.func2()
2026-01-11 18:05:49.002 [error] 	github.com/microsoft/typescript-go/internal/ls/autoimport/registry.go:1127 +0x77e
2026-01-11 18:05:49.002 [error] sync.(*WaitGroup).Go.func1()
2026-01-11 18:05:49.002 [error] 	sync/waitgroup.go:239 +0x4a
2026-01-11 18:05:49.002 [error] created by sync.(*WaitGroup).Go in goroutine 47034
2026-01-11 18:05:49.002 [error] 	sync/waitgroup.go:237 +0x73
2026-01-11 18:05:49.135 [error] Server process exited with code 2.
2026-01-11 18:05:49.136 [error] The typescript.native-preview-lsp server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.

.vscode/extensions/typescriptteam.native-preview-0.20260111.1-linux-x64/lib/tsgo on a pnpm monorepo.

[christophe-g]

There was a comment about #2390 not working with pnpm - might be related #2390 (comment) ?

[jakebailey]

I don't think they implied a crash; a repro would be most helpful here.

[Bill-Owen]

Getting this too. We are using pnpm if that's relevant

[jansedlon]

Same, pnpm + monorepo

[lukpsaxo]

I use yarn with a traditional copy files into node_modules and after upgrading I get this error on seemingly every file - so the extension appears to have become unusable for me.

[rvion]

same; can't use tsgo at all on my project

[gggdomi]

Same issue here, using yarn. tsgo 0.20260112.1 via VSCode's typescriptteam.native-preview just crashes on launch.

[WonderPanda]

I just started seeing this today as well. Using pnpm in an NX monorepo. I've been using tsgo happily in the repo for several weeks prior to this.

Switching back to a previous version from 3 days ago 0.20260109.1 is working though

[andrewbranch]

This is probably caused by a specific dependency that you all have in common. Ways I can possibly get this fixed:

• someone shares a repro
• someone shares their pnpm lockfile
• someone is willing to build a branch from source with additional logging and try that

[WonderPanda]

This is probably caused by a specific dependency that you all have in common. Ways I can possibly get this fixed:

• someone shares a repro
• someone shares their pnpm lockfile
• someone is willing to build a branch from source with additional logging and try that

@andrewbranch Can I email you the lockfile?

[jansedlon]

I have added some logs to the getModuleIDAndFileNameOfModuleSymbol function like this

decl := ast.GetNonAugmentationDeclaration(symbol)
	if decl == nil {
		println("Symbol details:")
		println(fmt.Sprintf("  Name: %s", symbol.Name))
		println(fmt.Sprintf("  Declarations count: %d", len(symbol.Declarations)))
		for i, d := range symbol.Declarations {
			println(fmt.Sprintf("    [%d] Kind: %s", i, d.Kind))
		}
		println(fmt.Sprintf("  Flags: %v", symbol.Flags))
		println(fmt.Sprintf("  Parent: %v", symbol.Parent))
		panic("module symbol has no non-augmentation declaration")
	}

It prints out this

2026-01-12 18:23:57.228 [error] Symbol details:
2026-01-12 18:23:57.229 [error]   Name: "@vitest/expect"
2026-01-12 18:23:57.229 [error]   Declarations count: 1
2026-01-12 18:23:57.229 [error]     [0] Kind: KindModuleDeclaration
2026-01-12 18:23:57.229 [error]   Flags: 1024
2026-01-12 18:23:57.229 [error]   Parent: <nil>
2026-01-12 18:23:57.232 [error] panic: module symbol has no non-augmentation declaration

Does this help? I can email you my lockfile as well

[andrewbranch]

@jansedlon thank you! Could you print ast.GetSourceFileOfNode(symbol.Declarations[0]).FileName() as well? I think that should be enough to get me a repro.