1 files changed, 12 insertions, 2 deletions
diff --git a/src/web3_wrapper.ts b/src/web3_wrapper.ts
index 3b1e4477b..d03c102b2 100644
--- a/src/web3_wrapper.ts
+++ b/src/web3_wrapper.ts
@@ -10,10 +10,16 @@ export class Web3Wrapper {
     private defaults: Partial<Web3.TxData>;
     private networkIdIfExists?: number;
     private jsonRpcRequestId: number;
-    constructor(provider: Web3.Provider, defaults: Partial<Web3.TxData>) {
+    constructor(provider: Web3.Provider, defaults?: Partial<Web3.TxData>) {
+        if (_.isUndefined((provider as any).sendAsync)) {
+            // Web3@1.0 provider doesn't support synchronous http requests,
+            // so it only has an async `send` method, instead of a `send` and `sendAsync` in web3@0.x.x`
+            // We re-assign the send method so that Web3@1.0 providers work with 0x.js
+            (provider as any).sendAsync = (provider as any).send;
+        }
         this.web3 = new Web3();
         this.web3.setProvider(provider);
-        this.defaults = defaults;
+        this.defaults = defaults || {};
         this.jsonRpcRequestId = 0;
     }
     public setProvider(provider: Web3.Provider) {
@@ -94,6 +100,10 @@ export class Web3Wrapper {
         const signData = await promisify(this.web3.eth.sign)(address, message);
         return signData;
     }
+    public async getBlockNumberAsync(): Promise<number> {
+        const blockNumber = await promisify(this.web3.eth.getBlockNumber)();
+        return blockNumber;
+    }
     public async getBlockAsync(blockParam: string|Web3.BlockParam): Promise<Web3.BlockWithoutTransactionData> {
         const block = await promisify(this.web3.eth.getBlock)(blockParam);
         return block;