1 files changed, 11 insertions, 7 deletions
diff --git a/packages/typescript-typings/types/web3-provider-engine/index.d.ts b/packages/typescript-typings/types/web3-provider-engine/index.d.ts
index 15a8d0005..8d5aef749 100644
--- a/packages/typescript-typings/types/web3-provider-engine/index.d.ts
+++ b/packages/typescript-typings/types/web3-provider-engine/index.d.ts
@@ -1,8 +1,12 @@
 declare module 'web3-provider-engine' {
-    class Web3ProviderEngine {
+    import { Provider, JSONRPCRequestPayload, JSONRPCResponsePayload } from '@0xproject/types';
+    class Web3ProviderEngine implements Provider {
         public on(event: string, handler: () => void): void;
-        public send(payload: any): void;
-        public sendAsync(payload: any, callback: (error: any, response: any) => void): void;
+        public send(payload: JSONRPCRequestPayload): void;
+        public sendAsync(
+            payload: JSONRPCRequestPayload,
+            callback: (error: null | Error, response: JSONRPCResponsePayload) => void,
+        ): void;
         public addProvider(provider: any): void;
         public start(): void;
         public stop(): void;
@@ -19,13 +23,13 @@ declare module 'web3-provider-engine/subproviders/subprovider' {
     export = Subprovider;
 }
 declare module 'web3-provider-engine/subproviders/rpc' {
-    import { JSONRPCRequestPayload } from '@0xproject/types';
+    import { JSONRPCRequestPayload, JSONRPCResponsePayload } from '@0xproject/types';
     class RpcSubprovider {
         constructor(options: { rpcUrl: string });
         public handleRequest(
             payload: JSONRPCRequestPayload,
             next: () => void,
-            end: (err: Error | null, data?: any) => void,
+            end: (err: Error | null, data?: JSONRPCResponsePayload) => void,
         ): void;
     }
     export = RpcSubprovider;
@@ -37,13 +41,13 @@ declare module 'web3-provider-engine/util/rpc-cache-utils' {
     export = ProviderEngineRpcUtils;
 }
 declare module 'web3-provider-engine/subproviders/fixture' {
-    import { JSONRPCRequestPayload } from '@0xproject/types';
+    import { JSONRPCRequestPayload, JSONRPCResponsePayload } from '@0xproject/types';
     class FixtureSubprovider {
         constructor(staticResponses: any);
         public handleRequest(
             payload: JSONRPCRequestPayload,
             next: () => void,
-            end: (err: Error | null, data?: any) => void,
+            end: (err: Error | null, data?: JSONRPCResponsePayload) => void,
         ): void;
     }
     export = FixtureSubprovider;