Throw and handle errors from Providers.

In web3 wrapper when a response contains an error field we throw this rather than return response.result which is often undefined.
In Signature Utils we handle the error thrown when a user rejects the signing dialogue to prevent double signing.
Exposed the ZeroExTransaction JSON schema.
In Website only use the MetamaskSubprovider if we can detect the provider is Metamask

1 files changed, 1 insertions, 0 deletions

diff --git a/packages/0x.js/src/index.ts b/packages/0x.js/src/index.ts
index 228bcecdb..6eb1fd8ee 100644
--- a/packages/0x.js/src/index.ts
+++ b/packages/0x.js/src/index.ts
@@ -90,6 +90,7 @@ export {
     JSONRPCRequestPayload,
     JSONRPCResponsePayload,
     JSONRPCErrorCallback,
+    JSONRPCResponseError,
     LogEntry,
     DecodedLogArgs,
     LogEntryEvent,