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fix(ui): reduce markdown jank while responses stream (#19304)

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This commit is contained in:
Shoubhit Dash
2026-03-27 01:13:30 +05:30
committed by GitHub
parent 311ba4179a
commit b7a06e1939
4 changed files with 109 additions and 44 deletions
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packages/ui/src/components/message-part.tsx
+8 -2
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@@ -1334,6 +1334,9 @@ PART_MAPPING["text"] = function TextPartDisplay(props) {
const displayText = () => (part().text ?? "").trim()
const throttledText = createThrottledValue(displayText)
const streaming = createMemo(
() => props.message.role === "assistant" && typeof (props.message as AssistantMessage).time.completed !== "number",
)
const isLastTextPart = createMemo(() => {
const last = (data.store.part?.[props.message.id] ?? [])
.filter((item): item is TextPart => item?.type === "text" && !!item.text?.trim())
@@ -1360,7 +1363,7 @@ PART_MAPPING["text"] = function TextPartDisplay(props) {
<Show when={throttledText()}>
<div data-component="text-part">
<div data-slot="text-part-body">
<Markdown text={throttledText()} cacheKey={part().id} />
<Markdown text={throttledText()} cacheKey={part().id} streaming={streaming()} />
</div>
<Show when={showCopy()}>
<div data-slot="text-part-copy-wrapper" data-interrupted={interrupted() ? "" : undefined}>
@@ -1394,11 +1397,14 @@ PART_MAPPING["reasoning"] = function ReasoningPartDisplay(props) {
const part = () => props.part as ReasoningPart
const text = () => part().text.trim()
const throttledText = createThrottledValue(text)
const streaming = createMemo(
() => props.message.role === "assistant" && typeof (props.message as AssistantMessage).time.completed !== "number",
)
return (
<Show when={throttledText()}>
<div data-component="reasoning-part">
<Markdown text={throttledText()} cacheKey={part().id} />
<Markdown text={throttledText()} cacheKey={part().id} streaming={streaming()} />
</div>
</Show>
)