Interface for EventDescription renamed topics

packages/typescript-typings/types/ethers/index.d.ts

@@ -18,7 +18,7 @@ declare module 'ethers' {
         parse: (...args: any[]) => any;
         inputs: { names: string[]; types: string[] };
         signature: string;
-        topic: string;
+        topics: string[];
     }
     export class Interface {
         public functions: { [functionName: string]: FunctionDescription };

packages/utils/src/abi_decoder.ts

@@ -80,7 +80,7 @@ export class AbiDecoder {
         const ethersInterface = new ethers.Interface(abiArray);
         _.map(abiArray, (abi: AbiDefinition) => {
             if (abi.type === AbiType.Event) {
-                const topic = ethersInterface.events[abi.name].topic;
+                const topic = ethersInterface.events[abi.name].topics[0];
                 this._methodIds[topic] = abi;
             }
         });