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fix(cli): enable DEC synchronized output on Warp to reduce redraw flicker #8832

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fix(cli): enable DEC synchronized output on Warp to reduce redraw flicker #8832

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3 changes: 3 additions & 0 deletions packages/cli/src/ui/utils/synchronizedOutput.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,10 @@ function createStdout(write: NodeJS.WriteStream['write']): NodeJS.WriteStream {
describe('terminalSupportsSynchronizedOutput', () => {
it.each([
[{ TERM_PROGRAM: 'WezTerm' }, true],
[{ TERM_PROGRAM: 'WarpTerminal' }, true],
[{ TERM_PROGRAM: 'ghostty' }, true],
[{ TERM_PROGRAM: 'iTerm.app' }, true],
[{ TERM_PROGRAM: 'WarpTerminal' }, true],
[{ TERM: 'xterm-kitty' }, true],
[{ KITTY_WINDOW_ID: '1' }, true],
[{ TERM_PROGRAM: 'Apple_Terminal' }, false],
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11 changes: 10 additions & 1 deletion packages/cli/src/ui/utils/synchronizedOutput.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,16 @@ export function terminalSupportsSynchronizedOutput(
}

const termProgram = env['TERM_PROGRAM'];
if (termProgram === 'WezTerm' || termProgram === 'iTerm.app') {
// Warp's DECRQM 2026 probe answers status 2 (recognized, reset), so
// synchronized updates are available there; without them Warp renders the
// erase-then-rewrite pattern as flicker (issue #8557). Ghostty implements
// synchronized output natively.
if (
termProgram === 'WezTerm' ||
termProgram === 'iTerm.app' ||
termProgram === 'WarpTerminal' ||
termProgram === 'ghostty'
) {
return true;
}

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