Support Tuples from function returns

3 files changed, 13 insertions, 10 deletions

diff --git a/packages/contract_templates/contract.handlebars b/packages/contract_templates/contract.handlebars
index 472452d74..cd50e14cd 100644
--- a/packages/contract_templates/contract.handlebars
+++ b/packages/contract_templates/contract.handlebars
@@ -8,7 +8,7 @@ import { BaseContract } from '@0xproject/base-contract';
 import { BlockParam, BlockParamLiteral, CallData, ContractAbi, DataItem, MethodAbi, Provider, TxData, TxDataPayable } from '@0xproject/types';
 import { BigNumber, classUtils, promisify } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import * as ethersContracts from 'ethers-contracts';
+import * as ethers from 'ethers'
 import * as _ from 'lodash';
 
 {{#if events}}
diff --git a/packages/contract_templates/partials/callAsync.handlebars b/packages/contract_templates/partials/callAsync.handlebars
index a6f4abdf2..3cc16ccc6 100644
--- a/packages/contract_templates/partials/callAsync.handlebars
+++ b/packages/contract_templates/partials/callAsync.handlebars
@@ -5,22 +5,25 @@ async callAsync(
     defaultBlock?: BlockParam,
 ): Promise<{{> return_type outputs=outputs}}> {
     const self = this as any as {{contractName}}Contract;
-    const inputAbi = self._lookupAbi('{{this.functionSignature}}').inputs;
+    const functionSignature = '{{this.functionSignature}}';
+    const inputAbi = self._lookupAbi(functionSignature).inputs;
     [{{> params inputs=inputs}}] = BaseContract._formatABIDataItemList(inputAbi, [{{> params inputs=inputs}}], BaseContract._bigNumberToString.bind(self));
-    const encodedData = self._lookupEthersInterface('{{this.functionSignature}}').functions.{{this.name}}(
+    const ethersFunction = self._lookupEthersInterface(functionSignature).functions.{{this.name}}(
         {{> params inputs=inputs}}
-    ).data;
+    ) as ethers.CallDescription;
+    const encodedData = ethersFunction.data;
     const callDataWithDefaults = await self._applyDefaultsToTxDataAsync(
         {
             data: encodedData,
         }
     )
     const rawCallResult = await self._web3Wrapper.callAsync(callDataWithDefaults, defaultBlock);
+    let result = ethersFunction.parse(rawCallResult);
+
     const outputAbi = (_.find(self.abi, {name: '{{this.name}}'}) as MethodAbi).outputs;
-    const outputParamsTypes = _.map(outputAbi, 'type');
-    let resultArray = ethersContracts.Interface.decodeParams(outputParamsTypes, rawCallResult) as any;
-    resultArray = BaseContract._formatABIDataItemList(outputAbi, resultArray, BaseContract._lowercaseAddress.bind(this));
-    resultArray = BaseContract._formatABIDataItemList(outputAbi, resultArray, BaseContract._bnToBigNumber.bind(this));
-    return resultArray{{#singleReturnValue}}[0]{{/singleReturnValue}};
+    result = BaseContract._formatABIDataItemList(outputAbi, result, BaseContract._lowercaseAddress.bind(this));
+    result = BaseContract._formatABIDataItemList(outputAbi, result, BaseContract._bnToBigNumber.bind(this));
+
+    return result{{#singleReturnValue}}[0]{{/singleReturnValue}};
 },
 {{/hasReturnValue}}
diff --git a/packages/contract_templates/partials/return_type.handlebars b/packages/contract_templates/partials/return_type.handlebars
index 9dd509953..77d96e8c4 100644
--- a/packages/contract_templates/partials/return_type.handlebars
+++ b/packages/contract_templates/partials/return_type.handlebars
@@ -1,6 +1,6 @@
 {{#if outputs.length}}
 {{#singleReturnValue}}
-{{#returnType outputs.0.type components}}{{/returnType}}
+{{#returnType outputs.0.type outputs.0.components}}{{/returnType}}
 {{/singleReturnValue}}
 {{^singleReturnValue}}
 [{{#each outputs}}{{#returnType type components}}{{/returnType}}{{#unless @last}}, {{/unless}}{{/each}}]