1 files changed, 11 insertions, 0 deletions
diff --git a/packages/instant/src/util/maybe_big_number.ts b/packages/instant/src/util/maybe_big_number.ts
index f48473389..95fbd8695 100644
--- a/packages/instant/src/util/maybe_big_number.ts
+++ b/packages/instant/src/util/maybe_big_number.ts
@@ -22,4 +22,15 @@ export const maybeBigNumberUtil = {
         }
         return _.isUndefined(val1) && _.isUndefined(val2);
     },
+    // converts a BigNumber or String to the BigNumber used by 0x libraries
+    toMaybeBigNumber: (value: any): Maybe<BigNumber> => {
+        if (_.isString(value)) {
+            return maybeBigNumberUtil.stringToMaybeBigNumber(value);
+        }
+        // checks for pre v8 bignumber with member variable
+        if (BigNumber.isBigNumber(value) || value.isBigNumber) {
+            return new BigNumber(value.toString());
+        }
+        return undefined;
+    },
 };