From c8c5de590d2646f76c78cdc0f0ebc0c91d16f200 Mon Sep 17 00:00:00 2001
From: Evan Reichard <evan@reichard.io>
Date: Sun, 3 May 2026 21:14:07 -0400
Subject: [PATCH] perf: cache ANSI prefix regex in truncate instead of
 re-creating per call

---
 render.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/render.ts b/render.ts
index 97c055d..77f1b64 100644
--- a/render.ts
+++ b/render.ts
@@ -2,6 +2,7 @@ import type { ModuleSpec, RenderedModule } from "./types";
 
 // eslint-disable-next-line no-control-regex
 const ANSI_RE = new RegExp("\\u001b\\[[0-9;]*m", "g");
+const ANSI_PREFIX_RE = /^\u001b\[[0-9;]*m/;
 
 export function visibleWidth(text: string): number {
   return text.replace(ANSI_RE, "").length;
@@ -16,8 +17,7 @@ export function truncate(text: string, width: number): string {
   let count = 0;
   for (let index = 0; index < text.length && count < width; index++) {
     if (text[index] === "\x1b") {
-      // eslint-disable-next-line no-control-regex
-      const match = text.slice(index).match(new RegExp("^\\u001b\\[[0-9;]*m"));
+      const match = text.slice(index).match(ANSI_PREFIX_RE);
       if (match) {
         output += match[0];
         index += match[0].length - 1;