From cc048ac89822932338eeccda347756b98d7399fe Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 19 Sep 2026 14:47:17 +0000
Subject: [PATCH 1/2] Initial plan


From f91355104b9f258f65328dbe498e1e15777e050d Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 19 Sep 2026 14:52:18 +0000
Subject: [PATCH 2/2] Classify private identifiers as semantic tokens

Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>
---
 ...rnClassificationPrivateIdentifiers_test.go | 32 +++++++++++++++++++
 tsc/internal/ls/semantictokens.go             |  2 +-
 2 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 tsc/internal/fourslash/tests/semanticModernClassificationPrivateIdentifiers_test.go

diff --git a/tsc/internal/fourslash/tests/semanticModernClassificationPrivateIdentifiers_test.go b/tsc/internal/fourslash/tests/semanticModernClassificationPrivateIdentifiers_test.go
new file mode 100644
index 0000000000000..5f70ffde64b63
--- /dev/null
+++ b/tsc/internal/fourslash/tests/semanticModernClassificationPrivateIdentifiers_test.go
@@ -0,0 +1,32 @@
+package fourslash_test
+
+import (
+	"testing"
+
+	"github.com/microsoft/TypeScript/tsc/internal/fourslash"
+	"github.com/microsoft/TypeScript/tsc/internal/testutil"
+)
+
+func TestSemanticModernClassificationPrivateIdentifiers(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	const content = `class Foo {
+	#privateField = 1;
+	#privateMethod() {}
+
+	test() {
+		this.#privateField;
+		this.#privateMethod();
+	}
+}`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.VerifySemanticTokens(t, []fourslash.SemanticToken{
+		{Type: "class.declaration", Text: "Foo"},
+		{Type: "property.declaration", Text: "#privateField"},
+		{Type: "method.declaration", Text: "#privateMethod"},
+		{Type: "method.declaration", Text: "test"},
+		{Type: "property", Text: "#privateField"},
+		{Type: "method", Text: "#privateMethod"},
+	})
+}
diff --git a/tsc/internal/ls/semantictokens.go b/tsc/internal/ls/semantictokens.go
index 4213c9016bc5d..e5fe386a36183 100644
--- a/tsc/internal/ls/semantictokens.go
+++ b/tsc/internal/ls/semantictokens.go
@@ -253,7 +253,7 @@ func (l *LanguageService) collectSemanticTokensInRange(ctx context.Context, c *c
 			inJSXElement = false
 		}
 
-		if ast.IsIdentifier(node) && node.Text() != "" && !inJSXElement && !isInImportClause(node) && !isInfinityOrNaNString(node.Text()) {
+		if (ast.IsIdentifier(node) || ast.IsPrivateIdentifier(node)) && node.Text() != "" && !inJSXElement && !isInImportClause(node) && !isInfinityOrNaNString(node.Text()) {
 			symbol := c.GetSymbolAtLocation(node)
 			if symbol != nil {
 				// Resolve aliases