1 files changed, 20 insertions, 1 deletions
diff --git a/src/ts/types.ts b/src/ts/types.ts
index 04902cca6..4da03a4d3 100644
--- a/src/ts/types.ts
+++ b/src/ts/types.ts
@@ -1,5 +1,4 @@
 import * as _ from 'lodash';
-import * as BigNumber from 'bignumber.js';
 
 // Utility function to create a K:V from a list of strings
 // Adapted from: https://basarat.gitbooks.io/typescript/content/docs/types/literal-types.html
@@ -10,6 +9,26 @@ function strEnum(values: string[]): {[key: string]: string} {
     }, Object.create(null));
 }
 
+export const ZeroExError = strEnum([
+  'CONTRACT_DOES_NOT_EXIST',
+  'UNHANDLED_ERROR',
+  'USER_HAS_NO_ASSOCIATED_ADDRESSES',
+]);
+export type ZeroExError = keyof typeof ZeroExError;
+
+/**
+ * Elliptic Curve signature
+ */
+export interface ECSignature {
+    v: number;
+    r: string;
+    s: string;
+}
+
+export interface ExchangeContract {
+    isValidSignature: any;
+}
+
 export const SolidityTypes = strEnum([
     'address',
     'uint256',