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openProp : internalOpen; const [durationLabel, setDurationLabel] = React.useState(null); const [hasStreamed, setHasStreamed] = React.useState(isStreaming); const startedAtRef = React.useRef(null); React.useEffect(() => { if (isStreaming) { startedAtRef.current = Date.now(); onOpenChange?.(true); } }, [isStreaming, onOpenChange]); useOnChange(isStreaming, (current, previous) => { if (!previous && current) { setHasStreamed(true); startedAtRef.current = Date.now(); setDurationLabel(null); if (!isControlled) { setInternalOpen(true); } onOpenChange?.(true); } if (previous && !current) { const startedAt = startedAtRef.current; const elapsedSeconds = startedAt != null ? Math.max(1, Math.round((Date.now() - startedAt) / 1000)) : null; setDurationLabel( elapsedSeconds != null ? String(elapsedSeconds) : "a few", ); startedAtRef.current = null; if (!isControlled) { setInternalOpen(false); } onOpenChange?.(false); } }); const label = React.useMemo(() => { if (!hasStreamed || isStreaming) return "Thinking..."; if (durationLabel != null) { const unit = durationLabel === "1" ? "second" : "seconds"; return `Thought for ${durationLabel} ${unit}`; } return "Thought for a few seconds"; }, [durationLabel, hasStreamed, isStreaming]); const contextValue = React.useMemo( () => ({ isStreaming, label }), [isStreaming, label], ); const handleOpenChange = React.useCallback( (nextOpen: boolean) => { const resolvedOpen = isStreaming ? true : nextOpen; if (!isControlled) { setInternalOpen(resolvedOpen); } onOpenChange?.(resolvedOpen); }, [isControlled, isStreaming, onOpenChange], ); return ( {children} ); } type ReasoningTriggerProps = React.ComponentProps; function ReasoningTrigger({ className, children, ...props }: ReasoningTriggerProps) { const { isStreaming, label } = useReasoningContext("ReasoningTrigger"); return ( {children ?? label} ); } type ReasoningContentProps = Omit< React.ComponentProps, "children" > & { children: string; }; function ReasoningContent({ className, children, ...props }: ReasoningContentProps) { return ( *:first-child]:mt-0 [&>*:last-child]:mb-0", )} > {children} ); 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