From 9bf39ab1e40cb0daacaef42007bd687823c3368d Mon Sep 17 00:00:00 2001
From: Johannes Baum <annoraaq@users.noreply.github.com>
Date: Tue, 8 Aug 2023 19:41:01 +0200
Subject: [PATCH] #408 throw error

---
 src/GridTilemap/Phaser/PhaserTilemap.test.ts | 28 ++++++++++++++++++++
 src/GridTilemap/Phaser/PhaserTilemap.ts      | 10 ++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/src/GridTilemap/Phaser/PhaserTilemap.test.ts b/src/GridTilemap/Phaser/PhaserTilemap.test.ts
index 9f9281a7..ce8ef562 100644
--- a/src/GridTilemap/Phaser/PhaserTilemap.test.ts
+++ b/src/GridTilemap/Phaser/PhaserTilemap.test.ts
@@ -114,4 +114,32 @@ describe("PhaserTilemap", () => {
       );
     }
   });
+
+  it("should throw error if initialized without tilemapLayer", () => {
+    const tilemap = createPhaserTilemapStub(
+      new Map([["layer_name", ["..", ".."]]])
+    );
+    const tiledProject = {
+      propertyTypes: [
+        {
+          name: "SomeTiledClass",
+          type: "class",
+          members: [
+            {
+              name: "testProp",
+              type: "boolean",
+              value: true,
+            },
+          ],
+        },
+      ],
+    };
+    // @ts-ignore
+    tilemap.layers[0].tilemapLayer = undefined;
+    expect(() => new PhaserTilemap(tilemap, tiledProject)).toThrow(
+      new Error(
+        "Error initializing tilemap. Layer 'layer_name' has no 'tilemapLayer'. This can happen if you call 'createLayer' with the wrong layer ID."
+      )
+    );
+  });
 });
diff --git a/src/GridTilemap/Phaser/PhaserTilemap.ts b/src/GridTilemap/Phaser/PhaserTilemap.ts
index 10007091..05bfa6f2 100644
--- a/src/GridTilemap/Phaser/PhaserTilemap.ts
+++ b/src/GridTilemap/Phaser/PhaserTilemap.ts
@@ -19,7 +19,15 @@ export class PhaserTilemap implements Tilemap {
   constructor(
     private phaserTilemap: Phaser.Tilemaps.Tilemap,
     private tiledProject?: TiledProject
-  ) {}
+  ) {
+    for (const l of this.phaserTilemap.layers) {
+      if (l.tilemapLayer == null) {
+        throw new Error(
+          `Error initializing tilemap. Layer '${l.name}' has no 'tilemapLayer'. This can happen if you call 'createLayer' with the wrong layer ID.`
+        );
+      }
+    }
+  }
 
   getTileWidth(): number {
     return this.phaserTilemap.tileWidth;