/** AG-UI runtime event type constants normalized from legacy SSE event names. */
export declare const agUiSseEventTypes: {
    readonly custom: "CUSTOM";
    readonly textMessageStart: "TEXT_MESSAGE_START";
    readonly textMessageContent: "TEXT_MESSAGE_CONTENT";
    readonly textMessageEnd: "TEXT_MESSAGE_END";
    readonly reasoningMessageStart: "REASONING_MESSAGE_START";
    readonly reasoningMessageContent: "REASONING_MESSAGE_CONTENT";
    readonly reasoningMessageEnd: "REASONING_MESSAGE_END";
    readonly toolCallStart: "TOOL_CALL_START";
    readonly toolCallArgs: "TOOL_CALL_ARGS";
    readonly toolCallEnd: "TOOL_CALL_END";
    readonly toolCallResult: "TOOL_CALL_RESULT";
    readonly runStarted: "RUN_STARTED";
    readonly stateSnapshot: "STATE_SNAPSHOT";
    readonly messagesSnapshot: "MESSAGES_SNAPSHOT";
    readonly stepStarted: "STEP_STARTED";
    readonly stepFinished: "STEP_FINISHED";
    readonly runError: "RUN_ERROR";
    readonly runFinished: "RUN_FINISHED";
};
/** Normalized AG-UI runtime event type value. */
export type AgUiSseEventType = (typeof agUiSseEventTypes)[keyof typeof agUiSseEventTypes];
/** Parsed AG-UI SSE response summary for evals, canaries, and host tests. */
export interface ParsedAgUiSseRun {
    responseStatus: number;
    events: Array<Record<string, unknown>>;
    eventTypes: string[];
    toolStarts: string[];
    toolArgs: string[];
    text: string;
    runError: string | null;
}
/** Progress snapshot emitted while parsing an AG-UI SSE response. */
export interface AgUiSseProgressSnapshot {
    eventCount: number;
    lastEventType: string | null;
    lastToolCallName: string | null;
    toolStarts: string[];
    textLength: number;
}
/** Options for `parseAgUiSseResponse()`. */
export interface ParseAgUiSseResponseOptions {
    onProgress?: (snapshot: AgUiSseProgressSnapshot) => void;
    progressThrottleMs?: number;
}
/** Stringify an AG-UI SSE event or fallback value for diagnostics. */
export declare function stringifyAgUiSseEvent(value: unknown): string;
/** Return a string field from a parsed AG-UI SSE event record. */
export declare function getAgUiSseStringField(record: Record<string, unknown>, key: string): string | null;
/** Filter parsed AG-UI SSE events by normalized event type. */
export declare function getAgUiSseEventsOfType(events: Array<Record<string, unknown>>, eventType: string): Array<Record<string, unknown>>;
/** Build a compact ordered event-type signature for regression checks. */
export declare function buildAgUiSseTraceSignature(eventTypes: string[]): string;
/** Parse an AG-UI SSE `Response` into normalized events, text, tool starts, and terminal error state. */
export declare function parseAgUiSseResponse(response: Response, options?: ParseAgUiSseResponseOptions): Promise<ParsedAgUiSseRun>;
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