1 files changed, 16 insertions, 0 deletions
diff --git a/src/types.ts b/src/types.ts
index dc2a4d848..861df3187 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -17,6 +17,11 @@ export const ZeroExError = strEnum([
 ]);
 export type ZeroExError = keyof typeof ZeroExError;
 
+export const InternalError = strEnum([
+  'PROXY_ADDRESS_NOT_FOUND',
+]);
+export type InternalError = keyof typeof InternalError;
+
 /**
  * Elliptic Curve signature
  */
@@ -45,6 +50,17 @@ export interface ExchangeContract {
     ) => ContractResponse;
 }
 
+export interface TokenContract {
+    balanceOf: {
+        call: (address: string) => Promise<BigNumber.BigNumber>;
+    };
+    allowance: {
+        call: (ownerAddress: string, allowedAddress: string) => Promise<BigNumber.BigNumber>;
+    };
+    transfer: (to: string, amountInBaseUnits: BigNumber.BigNumber, opts: any) => Promise<boolean>;
+    approve: (proxyAddress: string, amountInBaseUnits: BigNumber.BigNumber, opts: any) => void;
+}
+
 export interface TokenRegistryContract {
     getTokenMetaData: {
         call: (address: string) => Promise<TokenMetadata>;