Garbled UTF-8 in bun-to-bun pipes

“The code page belongs to the console and is shared by every process attached to it, so two Bun processes in one console overwrite each other's saved value.”

Is this your bug? What gets counted gets fixed. Pile on.

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I hit this bug: rapsheet.dev/sheets/bun/issues/4408/file
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No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Garbled UTF-8 output when piping bun into bun on Windows. Only when the console code page is not already 65001; Bun sets and restores the shared console code page at startup and exit.

Is this your bug?

File my report

Where: Windows console
Versions: 1.4.2
Platforms: Windows
How bad: Breaks a normal workflow.

Not quite your bug?

Pending reads exit process early1 person
WriteStream ignores overridden _write1 person

Original reports2, newest first

Oct 7, 2026Windows: Bun switches the console code page to 65001 at startup, which garbles output and breaks other processes in the same console (root cause of #43660)#44693
Sep 21, 2026Windows: garbled UTF-8 output when piping bun -> bun, but only if the console codepage isn't already UTF-8 (65001)#43660

Garbled UTF-8 in bun-to-bun pipes

Is this your bug? What gets counted gets fixed. Pile on.

Is this your bug?

Not quite your bug?

Original reports2, newest first

Do you work on Bun?