very cursed message of failed load

src/main/java/com/viaversion/fabric/common/ViaFabric.java

@@ -0,0 +1,15 @@
+package com.viaversion.fabric.common;
+
+import net.fabricmc.api.ModInitializer;
+import net.fabricmc.loader.api.FabricLoader;
+
+public class ViaFabric implements ModInitializer {
+    @Override
+    public void onInitialize() {
+        if (FabricLoader.getInstance().getAllMods()
+                .stream()
+                .noneMatch(it -> it.getMetadata().getId().startsWith("viafabric-mc"))) {
+            System.out.println("ViaFabric didn't load correctly... Are dependencies installed?");
+        }
+    }
+}

src/main/resources/fabric.mod.json

@@ -25,6 +25,11 @@
       }
     }
   ],
+  "entrypoints": {
+    "main": [
+      "com.viaversion.fabric.common.ViaFabric"
+    ]
+  },
   "contributors": [
     {
       "name": "GitHub contributors",