From 9f2d29b68b00d9719add89b4f23938ff2db45077 Mon Sep 17 00:00:00 2001
From: Tom Moor <tom@getoutline.com>
Date: Thu, 15 Dec 2022 06:09:22 -0800
Subject: [PATCH] fix typescript error

---
 packages/mermaid/src/utils.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/mermaid/src/utils.ts b/packages/mermaid/src/utils.ts
index 767fdaa7d..7c844ca8c 100644
--- a/packages/mermaid/src/utils.ts
+++ b/packages/mermaid/src/utils.ts
@@ -194,7 +194,7 @@ export const isSubstringInArray = function (str: string, arr: string[]): number
  * @param defaultCurve - The default curve to return
  * @returns The curve factory to use
  */
-export function interpolateToCurve(interpolate?: string, defaultCurve: CurveFactory): CurveFactory {
+export function interpolateToCurve(interpolate: string | undefined, defaultCurve: CurveFactory): CurveFactory {
   if (!interpolate) {
     return defaultCurve;
   }