From 3839db4d875b12760ff1bfd57c39cc19e853d117 Mon Sep 17 00:00:00 2001
From: cyphercodes <cyphercodes@users.noreply.github.com>
Date: Sat, 4 Jul 2026 18:22:02 +0300
Subject: [PATCH] fix: normalize config layout engine

---
 d2compiler/compile.go      |  2 +-
 d2compiler/compile_test.go | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/d2compiler/compile.go b/d2compiler/compile.go
index 66f6497a54..520f7cac06 100644
--- a/d2compiler/compile.go
+++ b/d2compiler/compile.go
@@ -1538,7 +1538,7 @@ func compileConfig(ir *d2ir.Map) (*d2target.Config, error) {
 
 	f = configMap.GetField(d2ast.FlatUnquotedString("layout-engine"))
 	if f != nil {
-		config.LayoutEngine = go2.Pointer(f.Primary().Value.ScalarString())
+		config.LayoutEngine = go2.Pointer(strings.ToLower(f.Primary().Value.ScalarString()))
 	}
 
 	f = configMap.GetField(d2ast.FlatUnquotedString("center"))
diff --git a/d2compiler/compile_test.go b/d2compiler/compile_test.go
index aacae33711..fba1b2a13f 100644
--- a/d2compiler/compile_test.go
+++ b/d2compiler/compile_test.go
@@ -5326,6 +5326,22 @@ x -> y
 					assert.Equal(t, true, *config.Sketch)
 				},
 			},
+			{
+				name: "layout-engine-case-insensitive",
+				run: func(t *testing.T) {
+					_, config, err := d2compiler.Compile("d2/testdata/d2compiler/TestCompile2/vars/config/layout-engine-case-insensitive.d2", strings.NewReader(`
+vars: {
+	d2-config: {
+    layout-engine: ELK
+  }
+}
+
+x -> y
+`), nil)
+					assert.Success(t, err)
+					assert.Equal(t, "elk", *config.LayoutEngine)
+				},
+			},
 			{
 				name: "invalid",
 				run: func(t *testing.T) {