From b07e834997a4cae8f95afd1f54bc0f04bd047310 Mon Sep 17 00:00:00 2001
From: delfino <delfino@dolphinlabs.co.uk>
Date: Fri, 14 Feb 2025 14:01:04 +0000
Subject: [PATCH] fixing forceAppendix null check & adding test

---
 d2js/d2wasm/functions.go        |  2 +-
 d2js/js/test/unit/basic.test.js | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/d2js/d2wasm/functions.go b/d2js/d2wasm/functions.go
index 0823f04fa..149685592 100644
--- a/d2js/d2wasm/functions.go
+++ b/d2js/d2wasm/functions.go
@@ -282,7 +282,7 @@ func Render(args []js.Value) (interface{}, error) {
 	if err != nil {
 		return nil, &WASMError{Message: fmt.Sprintf("render failed: %s", err.Error()), Code: 500}
 	}
-	if input.Opts != nil && *input.Opts.ForceAppendix {
+	if input.Opts != nil && *&input.Opts.ForceAppendix != nil && *input.Opts.ForceAppendix {
 		out = appendix.Append(input.Diagram, renderOpts, ruler, out)
 	}
 
diff --git a/d2js/js/test/unit/basic.test.js b/d2js/js/test/unit/basic.test.js
index 7f4b5a936..985855988 100644
--- a/d2js/js/test/unit/basic.test.js
+++ b/d2js/js/test/unit/basic.test.js
@@ -45,6 +45,16 @@ describe("D2 Unit Tests", () => {
     await d2.worker.terminate();
   }, 20000);
 
+  test("force appendix works", async () => {
+    const d2 = new D2();
+    const result = await d2.compile("x: {tooltip: x appendix}", { forceAppendix: true });
+    const svg = await d2.render(result.diagram, { forceAppendix: true });
+    expect(svg).toContain("<svg");
+    expect(svg).toContain("</svg>");
+    expect(svg).toContain('class="appendix"');
+    await d2.worker.terminate();
+  }, 20000);
+
   test("latex works", async () => {
     const d2 = new D2();
     const result = await d2.compile("x: |latex \\frac{f(x+h)-f(x)}{h} |");