diff --git a/.changeset/update-typescript-go.md b/.changeset/update-typescript-go.md
new file mode 100644
index 00000000..f07c6a3a
--- /dev/null
+++ b/.changeset/update-typescript-go.md
@@ -0,0 +1,5 @@
+---
+"@effect/tsgo": patch
+---
+
+Update [`typescript-go`](https://github.com/microsoft/typescript-go/commit/47ca64821ddc972ae77ed3b75337ac3a2d635562) to commit `47ca64821ddc972ae77ed3b75337ac3a2d635562`.
diff --git a/flake.nix b/flake.nix
index 4f0bb8a2..1cb598ef 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,7 +7,7 @@
     /* Source of truth: git submodule `typescript-go` commit.
        Keep in sync via `_tools/update-flake-vendor-hash.sh`. */
     typescript-go-src = {
-      url = "github:microsoft/typescript-go/01cc06960f62a508d26232175e0fcfd16846ed4f?submodules=1";
+      url = "github:microsoft/typescript-go/47ca64821ddc972ae77ed3b75337ac3a2d635562?submodules=1";
       flake = false;
     };
     /* Source of truth: typescript-go's `_submodules/TypeScript` commit.
diff --git a/shim/checker/shim.go b/shim/checker/shim.go
index 0b14087c..f651b4b7 100644
--- a/shim/checker/shim.go
+++ b/shim/checker/shim.go
@@ -414,6 +414,7 @@ type extra_Checker struct {
   reportedUnreachableNodes collections.Set[*ast.Node]
   nonExistentProperties collections.Set[checker.NonExistentPropertyKey]
   deferredDiagnosticCallbacks []func()
+  typeToStringNodebuilder *checker.NodeBuilder
   mu sync.Mutex
   tracer *checker.Tracer
 }
diff --git a/shim/ls/lsutil/shim.go b/shim/ls/lsutil/shim.go
index 18e7cef2..fe5178d1 100644
--- a/shim/ls/lsutil/shim.go
+++ b/shim/ls/lsutil/shim.go
@@ -63,11 +63,6 @@ type IncludeInlayParameterNameHints = lsutil.IncludeInlayParameterNameHints
 const IncludeInlayParameterNameHintsAll = lsutil.IncludeInlayParameterNameHintsAll
 const IncludeInlayParameterNameHintsLiterals = lsutil.IncludeInlayParameterNameHintsLiterals
 const IncludeInlayParameterNameHintsNone = lsutil.IncludeInlayParameterNameHintsNone
-type IncludePackageJsonAutoImports = lsutil.IncludePackageJsonAutoImports
-const IncludePackageJsonAutoImportsAuto = lsutil.IncludePackageJsonAutoImportsAuto
-const IncludePackageJsonAutoImportsOff = lsutil.IncludePackageJsonAutoImportsOff
-const IncludePackageJsonAutoImportsOn = lsutil.IncludePackageJsonAutoImportsOn
-const IncludePackageJsonAutoImportsUnknown = lsutil.IncludePackageJsonAutoImportsUnknown
 type IndentStyle = lsutil.IndentStyle
 const IndentStyleBlock = lsutil.IndentStyleBlock
 const IndentStyleNone = lsutil.IndentStyleNone
diff --git a/typescript-go b/typescript-go
index 01cc0696..47ca6482 160000
--- a/typescript-go
+++ b/typescript-go
@@ -1 +1 @@
-Subproject commit 01cc06960f62a508d26232175e0fcfd16846ed4f
+Subproject commit 47ca64821ddc972ae77ed3b75337ac3a2d635562