From 5a8bbe3d0e2b860307e2eff684fa9329cd9666f2 Mon Sep 17 00:00:00 2001
From: Michal Fudala <mail@michalfudala.com>
Date: Mon, 16 Feb 2026 15:25:35 +0100
Subject: [PATCH] fix(isolateEntries): handle non-TTY stdout in build reporter
 (#887)
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The `clearLine` and `writeLine` helpers use TTY-only methods (`clearLine`, `cursorTo`,
`moveCursor`) without checking `process.stdout.isTTY`, causing builds to crash in
non-interactive environments like CI or piped output.

See error I got in my CI environment:

```
vite v7.3.1 building ssr environment for production...
✗ Build failed in 7ms
✓ 0 modules transformed.
✗ Build failed in 9ms
error during build:
[vite:isolate-entries] Could not load virtual:isolate-entries:
  [vite:transform-reporter] process.stdout.clearLine is not a function
```
---
 src/plugins/isolateEntries.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/plugins/isolateEntries.ts b/src/plugins/isolateEntries.ts
index 5da43e9..e812286 100644
--- a/src/plugins/isolateEntries.ts
+++ b/src/plugins/isolateEntries.ts
@@ -170,6 +170,7 @@ function transformReporterPlugin(
 }
 
 function writeLine(output: string): void {
+  if (!process.stdout.isTTY) return
   clearLine()
   if (output.length < process.stdout.columns) {
     process.stdout.write(output)
@@ -179,6 +180,7 @@ function writeLine(output: string): void {
 }
 
 function clearLine(move: number = 0): void {
+  if (!process.stdout.isTTY) return
   if (move < 0) {
     process.stdout.moveCursor(0, move)
   }