From f4a877df9e297c30d018fd1a3a4d1fb9482ddaba Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 11 Jun 2026 00:53:55 +0000
Subject: [PATCH 1/2] Initial plan


From 2a242f7337324d6aa76020408dce4d768a376df4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 11 Jun 2026 01:09:48 +0000
Subject: [PATCH 2/2] Fix fatal error when project reference path/circular have
 unexpected types

Use safe type assertions (comma-ok idiom) in parseProjectReference instead
of bare type assertions that panic when values are not string/bool.

Co-authored-by: DanielRosenwasser <972891+DanielRosenwasser@users.noreply.github.com>
---
 internal/tsoptions/parsinghelpers.go                 | 12 ++++++++----
 .../compiler/projectReferenceNonStringPath.js        |  8 ++++++++
 .../compiler/projectReferenceNonStringPath.symbols   |  6 ++++++
 .../compiler/projectReferenceNonStringPath.types     |  7 +++++++
 .../cases/compiler/projectReferenceNonStringPath.ts  |  7 +++++++
 5 files changed, 36 insertions(+), 4 deletions(-)
 create mode 100644 testdata/baselines/reference/compiler/projectReferenceNonStringPath.js
 create mode 100644 testdata/baselines/reference/compiler/projectReferenceNonStringPath.symbols
 create mode 100644 testdata/baselines/reference/compiler/projectReferenceNonStringPath.types
 create mode 100644 testdata/tests/cases/compiler/projectReferenceNonStringPath.ts

diff --git a/internal/tsoptions/parsinghelpers.go b/internal/tsoptions/parsinghelpers.go
index 47a4d476bf4..b540e47a044 100644
--- a/internal/tsoptions/parsinghelpers.go
+++ b/internal/tsoptions/parsinghelpers.go
@@ -74,11 +74,15 @@ func parseProjectReference(json any) []*core.ProjectReference {
 	var result []*core.ProjectReference
 	if v, ok := json.(*collections.OrderedMap[string, any]); ok {
 		var reference core.ProjectReference
-		if v, ok := v.Get("path"); ok {
-			reference.Path = v.(string)
+		if pathValue, ok := v.Get("path"); ok {
+			if pathStr, ok := pathValue.(string); ok {
+				reference.Path = pathStr
+			}
 		}
-		if v, ok := v.Get("circular"); ok {
-			reference.Circular = v.(bool)
+		if circularValue, ok := v.Get("circular"); ok {
+			if circularBool, ok := circularValue.(bool); ok {
+				reference.Circular = circularBool
+			}
 		}
 		result = append(result, &reference)
 	}
diff --git a/testdata/baselines/reference/compiler/projectReferenceNonStringPath.js b/testdata/baselines/reference/compiler/projectReferenceNonStringPath.js
new file mode 100644
index 00000000000..01e7588beb3
--- /dev/null
+++ b/testdata/baselines/reference/compiler/projectReferenceNonStringPath.js
@@ -0,0 +1,8 @@
+//// [tests/cases/compiler/projectReferenceNonStringPath.ts] ////
+
+//// [index.ts]
+export const x = 1;
+
+
+//// [index.js]
+export const x = 1;
diff --git a/testdata/baselines/reference/compiler/projectReferenceNonStringPath.symbols b/testdata/baselines/reference/compiler/projectReferenceNonStringPath.symbols
new file mode 100644
index 00000000000..601178d7c4b
--- /dev/null
+++ b/testdata/baselines/reference/compiler/projectReferenceNonStringPath.symbols
@@ -0,0 +1,6 @@
+//// [tests/cases/compiler/projectReferenceNonStringPath.ts] ////
+
+=== /src/index.ts ===
+export const x = 1;
+>x : Symbol(x, Decl(index.ts, 0, 12))
+
diff --git a/testdata/baselines/reference/compiler/projectReferenceNonStringPath.types b/testdata/baselines/reference/compiler/projectReferenceNonStringPath.types
new file mode 100644
index 00000000000..802ea8c2608
--- /dev/null
+++ b/testdata/baselines/reference/compiler/projectReferenceNonStringPath.types
@@ -0,0 +1,7 @@
+//// [tests/cases/compiler/projectReferenceNonStringPath.ts] ////
+
+=== /src/index.ts ===
+export const x = 1;
+>x : 1
+>1 : 1
+
diff --git a/testdata/tests/cases/compiler/projectReferenceNonStringPath.ts b/testdata/tests/cases/compiler/projectReferenceNonStringPath.ts
new file mode 100644
index 00000000000..181821407ea
--- /dev/null
+++ b/testdata/tests/cases/compiler/projectReferenceNonStringPath.ts
@@ -0,0 +1,7 @@
+// @filename: /src/tsconfig.json
+{
+    "references": [{ "path": true }, { "path": "./other", "circular": "yes" }]
+}
+
+// @filename: /src/index.ts
+export const x = 1;