import type { ChatStreamState } from "./chat-stream-handler.js";
export type StreamLifecycleShadowDivergence = "text" | "reasoning" | "tool_input" | "tool_result" | "finish_reason" | "usage" | "outcome" | "shadow_error";
export interface StreamLifecycleShadowReport {
    count: number;
    categories: readonly StreamLifecycleShadowDivergence[];
}
export interface StreamLifecycleShadow {
    observePart(part: unknown): void;
    compareLegacySnapshot(state: ChatStreamState): StreamLifecycleShadowReport;
}
export declare function createStreamLifecycleShadow(options: {
    availableToolNames: readonly string[] | null;
    providerExecutedToolNames: readonly string[];
}): StreamLifecycleShadow;
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