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Bruno Belloni
2738bd0ccc
The perf suite had no terminal scenario, so nothing guarded the terminal row cache (#2239) against regressions. The new terminalTui scenario streams a full-screen TUI into the terminal at 10 fps (every row rewritten, only the spinner row changed, the title updated, as agent CLIs do) while typing in an editor, through a hidden action registered only in dev and perf builds. rowsRebuiltPerTuiFrame counts row elements rebuilt per frame independently of MutationObserver batching and fails when no terminal output arrives; budget 3 (about 1.4 with the cache, the screen height without it). Co-authored-by: brunobelloni <14021404+brunobelloni@users.noreply.github.com>
29 lines
1.1 KiB
TypeScript
29 lines
1.1 KiB
TypeScript
type TuiWindow = Window & { __stopTuiRows?: () => number };
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/** Runs in the page; count replacements independently of observer delivery batches. */
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export function startTuiRowObserver() {
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const container = document.querySelector(".xterm .xterm-rows");
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if (!container?.childElementCount) throw new Error("terminal row renderer did not open");
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let rebuilt = 0;
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const count = (records: MutationRecord[]) => {
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for (const record of records) if (record.target.parentNode === container) rebuilt++;
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};
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const observer = new MutationObserver(count);
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observer.observe(container, { childList: true, subtree: true });
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(window as TuiWindow).__stopTuiRows = () => {
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count(observer.takeRecords());
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observer.disconnect();
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return rebuilt;
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};
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}
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export function stopTuiRowObserver(): number {
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const w = window as TuiWindow;
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const stop = w.__stopTuiRows;
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delete w.__stopTuiRows;
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if (!stop) throw new Error("terminal row observer did not start");
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const rebuilt = stop();
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if (!rebuilt) throw new Error("terminal TUI did not render any rows");
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return rebuilt;
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}
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