import type { SDKStreamEventPayload } from "./types.js";
export type StreamTextKind = "assistant" | "reasoning";
export interface StreamTextDelta {
    kind: StreamTextKind;
    text: string;
}
/**
 * Extract appendable assistant/reasoning text from a stream_event payload.
 *
 * Supports both shapes currently emitted by headless mode:
 * 1) content_block style: { type, delta: { text|reasoning } }
 * 2) message chunk style: { message_type: "assistant_message"|"reasoning_message", ... }
 */
export declare function extractStreamTextDelta(event: SDKStreamEventPayload): StreamTextDelta | null;
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