import * as React from 'react';
export interface ReasoningLabels {
    thinking?: string;
    thoughtFor?: (seconds: string) => string;
}
export interface ReasoningProps {
    /** Reasoning text. */
    text: string;
    /** 'streaming' while reasoning is in progress, 'done' when finished. */
    state: 'streaming' | 'done';
    /** How long the model reasoned, shown in the summary once done. */
    durationMs?: number | undefined;
    /** Initial expanded state of the reasoning panel. */
    defaultOpen?: boolean | undefined;
    /** Overrides for the built-in, localizable UI strings. */
    labels?: ReasoningLabels | undefined;
    /** Class name merged onto the root element. */
    className?: string | undefined;
}
/**
 * REQ-SURF-122: Base UI Collapsible. Auto-opens when streaming starts and
 * auto-closes once on done unless the user toggled during streaming. The panel
 * stays mounted (hidden when closed) so `aria-controls` always resolves. The
 * duration is `durationMs`, else `performance.now()` between the first
 * streaming commit and `done`.
 */
export declare function Reasoning({ text, state, durationMs, defaultOpen, labels, className }: ReasoningProps): React.JSX.Element;
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