From fdc425f23a222d7b9235f4d5dfcf87b03407779d Mon Sep 17 00:00:00 2001
From: Sam Reid <reids@colorado.edu>
Date: Thu, 2 Mar 2023 13:47:13 -0700
Subject: [PATCH] Mark array members as readonly, see
 https://github.com/phetsims/quadrilateral/issues/398

---
 js/quadrilateral/model/ShapeSnapshot.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/quadrilateral/model/ShapeSnapshot.ts b/js/quadrilateral/model/ShapeSnapshot.ts
index 5a0623f2..8298320e 100644
--- a/js/quadrilateral/model/ShapeSnapshot.ts
+++ b/js/quadrilateral/model/ShapeSnapshot.ts
@@ -36,7 +36,7 @@ export default class ShapeSnapshot {
   public readonly sideBCLength: number;
   public readonly sideDALength: number;
   public readonly sideCDLength: number;
-  private readonly sideLengths: number[];
+  private readonly sideLengths: readonly number[];
 
   public constructor( shapeModel: QuadrilateralShapeModel ) {
     this.isParallelogram = shapeModel.isParallelogramProperty.value;