From 5e768c19d01aedba63f0e4a14971b134fd9ac3de Mon Sep 17 00:00:00 2001
From: Melissa LeBlanc-Williams <melissa@adafruit.com>
Date: Sat, 10 Jun 2023 14:39:36 -0700
Subject: [PATCH] Stop modifying the event data in onSerialReceive

---
 package-lock.json | 4 ++--
 package.json      | 2 +-
 repl.js           | 8 +++++---
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index aef6e61..532a68a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@adafruit/circuitpython-repl-js",
-  "version": "1.2.2",
+  "version": "1.2.3",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@adafruit/circuitpython-repl-js",
-      "version": "1.2.2",
+      "version": "1.2.3",
       "license": "MIT",
       "devDependencies": {}
     }
diff --git a/package.json b/package.json
index df435dd..0c72781 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "publishConfig": {
     "registry": "https://npm.pkg.github.com"
   },
-  "version": "1.2.2",
+  "version": "1.2.3",
   "description": "A JavaScript Module to help with interfacing to the REPL on CircuitPython Devices over serial",
   "main": "repl.js",
   "dependencies": {
diff --git a/repl.js b/repl.js
index 8986a25..2c292fd 100644
--- a/repl.js
+++ b/repl.js
@@ -102,15 +102,17 @@ export class REPL {
     }
 
     async onSerialReceive(e) {
-        // Prepend a partial token if it exists
+        // We don't want to modify e.data, so we make a copy of it
+        let data = e.data;
 
+        // Prepend a partial token if it exists
         if (this._partialToken) {
-            e.data = this._partialToken + e.data;
+            data = this._partialToken + data;
             this._partialToken = null;
         }
 
         // Tokenize the larger string and send to the parent
-        let tokens = this._tokenize(e.data);
+        let tokens = this._tokenize(data);
 
         // Remove any partial tokens and store for the next serial data receive
         if (tokens.length && this._hasPartialToken(tokens.slice(-1))) {