5 files changed, 33 insertions, 47 deletions
diff --git a/packages/0x.js/src/globals.d.ts b/packages/0x.js/src/globals.d.ts
index 702f35149..505f9b933 100644
--- a/packages/0x.js/src/globals.d.ts
+++ b/packages/0x.js/src/globals.d.ts
@@ -66,6 +66,7 @@ declare module 'ethers-contracts' {
     export class Interface {
         public functions: { [functionName: string]: FunctionDescription };
         public events: { [eventName: string]: EventDescription };
+        public static decodeParams(types: string[], data: string): any[];
         constructor(abi: any);
     }
 }
diff --git a/packages/contract_templates/partials/call.handlebars b/packages/contract_templates/partials/call.handlebars
index 7ac3e1ee3..cfb9bea82 100644
--- a/packages/contract_templates/partials/call.handlebars
+++ b/packages/contract_templates/partials/call.handlebars
@@ -1,23 +1,3 @@
 public {{this.name}} = {
-    async callAsync(
-    {{> typed_params inputs=inputs}}
-        defaultBlock?: Web3.BlockParam,
-    ): Promise<{{> return_type outputs=outputs}}> {
-        const self = this as {{contractName}}Contract;
-        const inputAbi = _.find(this.abi, {name: '{{this.name}}'}).inputs;
-        [{{> params inputs=inputs}}] = BaseContract._transformABIData(inputAbi, [{{> params inputs=inputs}}], BaseContract._bigNumberToString.bind(this));
-        const callDescription = self._ethersInterface.functions.{{this.name}}(
-            {{> params inputs=inputs}}
-        ) as ethersContracts.CallDescription;
-        const callData = await self._applyDefaultsToTxDataAsync(
-            {
-                data: callDescription.data,
-            }
-        )
-        const rawCallResult = await self._web3Wrapper.callAsync(callData);
-        let resultArray = callDescription.parse(rawCallResult);
-        const outputAbi = _.find(this.abi, {name: '{{this.name}}'}).outputs;
-        resultArray = BaseContract._transformABIData(outputAbi, resultArray, BaseContract._lowercaseAddress.bind(this));
-        return resultArray{{#singleReturnValue}}[0]{{/singleReturnValue}};
-    },
+    {{> callAsync}}
 };
diff --git a/packages/contract_templates/partials/callAsync.handlebars b/packages/contract_templates/partials/callAsync.handlebars
new file mode 100644
index 000000000..88cc49ffa
--- /dev/null
+++ b/packages/contract_templates/partials/callAsync.handlebars
@@ -0,0 +1,29 @@
+{{#hasReturnValue}}
+async callAsync(
+{{> typed_params inputs=inputs}}
+{{#this.payable}}
+    txData: TxDataPayable = {},
+{{/this.payable}}
+{{^this.payable}}
+    txData: TxData = {},
+{{/this.payable}}
+): Promise<{{> return_type outputs=outputs}}> {
+    const self = this as {{contractName}}Contract;
+    const inputAbi = _.find(this.abi, {name: '{{this.name}}'}).inputs;
+    [{{> params inputs=inputs}}] = BaseContract._transformABIData(inputAbi, [{{> params inputs=inputs}}], BaseContract._bigNumberToString.bind(this));
+    const encodedData = self._ethersInterface.functions.{{this.name}}(
+        {{> params inputs=inputs}}
+    ).data;
+    const callData = await self._applyDefaultsToTxDataAsync(
+        {
+            data: encodedData,
+        }
+    )
+    const rawCallResult = await self._web3Wrapper.callAsync(callData);
+    const outputAbi = _.find(this.abi, {name: '{{this.name}}'}).outputs as Web3.DataItem[];
+    const outputParamsTypes = _.map(outputAbi, 'type');
+    let resultArray = ethersContracts.Interface.decodeParams(outputParamsTypes, rawCallResult) as any;
+    resultArray = BaseContract._transformABIData(outputAbi, resultArray, BaseContract._lowercaseAddress.bind(this));
+    return resultArray{{#singleReturnValue}}[0]{{/singleReturnValue}};
+},
+{{/hasReturnValue}}
diff --git a/packages/contract_templates/partials/tx.handlebars b/packages/contract_templates/partials/tx.handlebars
index 5026dac20..347a482d6 100644
--- a/packages/contract_templates/partials/tx.handlebars
+++ b/packages/contract_templates/partials/tx.handlebars
@@ -54,30 +54,5 @@ public {{this.name}} = {
         ).data
         return abiEncodedTransactionData;
     },
-    async callAsync(
-    {{> typed_params inputs=inputs}}
-    {{#this.payable}}
-        txData: TxDataPayable = {},
-    {{/this.payable}}
-    {{^this.payable}}
-        txData: TxData = {},
-    {{/this.payable}}
-    ): Promise<{{> return_type outputs=outputs}}> {
-        const self = this as {{contractName}}Contract;
-        const inputAbi = _.find(this.abi, {name: '{{this.name}}'}).inputs;
-        [{{> params inputs=inputs}}] = BaseContract._transformABIData(inputAbi, [{{> params inputs=inputs}}], BaseContract._bigNumberToString.bind(this));
-        const callDescription = self._ethersInterface.functions.{{this.name}}(
-            {{> params inputs=inputs}}
-        ) as ethersContracts.CallDescription;
-        const callData = await self._applyDefaultsToTxDataAsync(
-            {
-                data: callDescription.data,
-            }
-        )
-        const rawCallResult = await self._web3Wrapper.callAsync(callData);
-        let resultArray = callDescription.parse(rawCallResult);
-        const outputAbi = _.find(this.abi, {name: '{{this.name}}'}).outputs;
-        resultArray = BaseContract._transformABIData(outputAbi, resultArray, BaseContract._lowercaseAddress.bind(this));
-        return resultArray{{#singleReturnValue}}[0]{{/singleReturnValue}};
-    },
+    {{> callAsync}}
 };
diff --git a/packages/contracts/globals.d.ts b/packages/contracts/globals.d.ts
index fe39fb11d..beb3bfd8c 100644
--- a/packages/contracts/globals.d.ts
+++ b/packages/contracts/globals.d.ts
@@ -57,6 +57,7 @@ declare module 'ethers-contracts' {
     export class Interface {
         public functions: { [functionName: string]: FunctionDescription };
         public events: { [eventName: string]: EventDescription };
+        public static decodeParams(types: string[], data: string): any[];
         constructor(abi: any);
     }
 }