fix(cli): throw warning for duplicate systems

.changeset/calm-drinks-dance.md

@@ -0,0 +1,6 @@
+---
+"@latticexyz/cli": patch
+"@latticexyz/world": patch
+---
+
+Attempting to deploy multiple systems where there are overlapping system IDs now throws an error.

packages/cli/src/deploy/resolveConfig.ts

@@ -9,6 +9,7 @@ import { getExistingContracts } from "../utils/getExistingContracts";
 import { defaultModuleContracts } from "../utils/modules/constants";
 import { getContractData } from "../utils/utils/getContractData";
 import { configToTables } from "./configToTables";
+import { groupBy } from "@latticexyz/common/utils";
 
 // TODO: this should be replaced by https://github.com/latticexyz/mud/issues/1668
 
@@ -70,6 +71,21 @@ export function resolveConfig<config extends ConfigInput>({
     };
   });
 
+  // Check for overlapping system IDs (since names get truncated when turning into IDs)
+  // TODO: move this into the world config resolve step once it resolves system IDs
+  const systemsById = groupBy(systems, (system) => system.systemId);
+  const overlappingSystems = Array.from(systemsById.values())
+    .filter((matches) => matches.length > 1)
+    .flat();
+  if (overlappingSystems.length) {
+    const names = overlappingSystems.map((system) => system.name);
+    throw new Error(
+      `Found systems with overlapping system ID: ${names.join(
+        ", "
+      )}.\n\nSystem IDs are generated from the first 16 bytes of the name, so you may need to rename them to avoid the overlap.`
+    );
+  }
+
   // ugh (https://github.com/latticexyz/mud/issues/1668)
   const resolveContext = {
     tableIds: Object.fromEntries(

packages/world/ts/config/resolveWorldConfig.ts

@@ -1,4 +1,4 @@
-import { STORE_NAME_MAX_LENGTH, UnrecognizedSystemErrorFactory } from "@latticexyz/config";
+import { UnrecognizedSystemErrorFactory } from "@latticexyz/config";
 import { StoreConfig } from "@latticexyz/store";
 import { SystemConfig, WorldConfig } from "./types";
 
@@ -55,7 +55,7 @@ export function resolveWorldConfig(config: StoreConfig & WorldConfig, existingCo
  * Default value for accessListSystems is []
  */
 export function resolveSystemConfig(systemName: string, config?: SystemConfig, existingContracts?: string[]) {
-  const name = (config?.name ?? systemName).slice(0, STORE_NAME_MAX_LENGTH);
+  const name = config?.name ?? systemName;
   const registerFunctionSelectors = config?.registerFunctionSelectors ?? true;
   const openAccess = config?.openAccess ?? true;
   const accessListAddresses: string[] = [];