From 232af830c9c844fa5b6f2e5b4c50c2f0a067188e Mon Sep 17 00:00:00 2001
From: Derrick Hammer <derrick@derrickhammer.com>
Date: Sun, 23 Jul 2023 10:06:18 -0400
Subject: [PATCH] feat: use event emitter and emit "update" on every light
 client update processed

---
 npm-shrinkwrap.json | 6 +++---
 package.json        | 1 +
 src/baseClient.ts   | 6 +++++-
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index e349d9e..955d9cd 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -1,11 +1,11 @@
 {
-    "name": "@lumeweb/libethclient",
+    "name": "@lumeweb/libethsync",
     "version": "0.1.0-develop.41",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
-            "name": "@lumeweb/libethclient",
+            "name": "@lumeweb/libethsync",
             "version": "0.1.0-develop.41",
             "dependencies": {
                 "@chainsafe/as-sha256": "^0.3.1",
@@ -28,6 +28,7 @@
                 "axios-retry": "^3.5.1",
                 "detect-node": "^2.1.0",
                 "ethereum-cryptography": "^2.0.0",
+                "events": "^3.3.0",
                 "node-cache": "^5.1.2",
                 "rlp": "^3.0.0",
                 "web3-types": "^1.0.1"
@@ -8734,7 +8735,6 @@
             "version": "3.3.0",
             "resolved": "https://registry.npmjs.org/events/-/events-3.3.0.tgz",
             "integrity": "sha512-mQw+2fkQbALzQ7V0MY0IqdnXNOeTtP4r0lN9z7AAawCXgqea7bDii20AYrIBrFd/Hx0M2Ocz6S111CaFkUcb0Q==",
-            "dev": true,
             "engines": {
                 "node": ">=0.8.x"
             }
diff --git a/package.json b/package.json
index 5e17853..3c8f49e 100644
--- a/package.json
+++ b/package.json
@@ -47,6 +47,7 @@
         "axios-retry": "^3.5.1",
         "detect-node": "^2.1.0",
         "ethereum-cryptography": "^2.0.0",
+        "events": "^3.3.0",
         "node-cache": "^5.1.2",
         "rlp": "^3.0.0",
         "web3-types": "^1.0.1"
diff --git a/src/baseClient.ts b/src/baseClient.ts
index 55d8abf..9df5c00 100644
--- a/src/baseClient.ts
+++ b/src/baseClient.ts
@@ -20,6 +20,7 @@ import {
 } from "#types.js";
 import { assertValidLightClientUpdate } from "@lodestar/light-client/validation";
 import * as capella from "@lodestar/types/capella";
+import { EventEmitter } from "events";
 
 export interface BaseClientOptions {
   prover: IProver;
@@ -30,7 +31,7 @@ export interface BaseClientOptions {
   loggerErr: (...any) => void;
 }
 
-export default abstract class BaseClient {
+export default abstract class BaseClient extends EventEmitter {
   protected latestCommittee?: Uint8Array[];
   protected latestBlockHash?: string;
   protected config: ClientConfig = getDefaultClientConfig();
@@ -45,6 +46,7 @@ export default abstract class BaseClient {
   private optimisticMutex = new Mutex();
 
   constructor(options: BaseClientOptions) {
+    super();
     this.options = options;
   }
 
@@ -143,6 +145,8 @@ export default abstract class BaseClient {
 
         startCommittee = validOrCommittee as Uint8Array[];
 
+        this.emit("update", update);
+
         if (this.options.syncDelay) {
           await new Promise((resolve) =>
             setTimeout(resolve, this.options.syncDelay),