Improve error handling for unknown network ids in contract-wrappers

1 files changed, 13 insertions, 0 deletions

diff --git a/packages/contract-wrappers/src/utils/contract_addresses.ts b/packages/contract-wrappers/src/utils/contract_addresses.ts
new file mode 100644
index 000000000..c32907c24
--- /dev/null
+++ b/packages/contract-wrappers/src/utils/contract_addresses.ts
@@ -0,0 +1,13 @@
+import { ContractAddresses, getContractAddressesForNetwork, NetworkId } from '@0xproject/contract-addresses';
+import * as _ from 'lodash';
+
+// Returns the default contract addresses for the given networkId or throws with
+// a context-specific error message if the networkId is not recognized.
+export function _getDefaultContractAddresses(networkId: number): ContractAddresses {
+    if (!(networkId in NetworkId)) {
+        throw new Error(
+            `No default contract addresses found for the given network id (${networkId}). If you want to use ContractWrappers on this network, you must manually pass in the contract address(es) to the constructor.`,
+        );
+    }
+    return getContractAddressesForNetwork(networkId);
+}