import type { AgUiRuntimeStreamEvent } from "./encoder.js";
import type { ChatFinishReason, ChatStreamEvent } from "../../chat/protocol.js";
/** Usage metadata captured from an AG-UI runtime finish event. */
export type AgUiRuntimeChatStreamUsage = {
    inputTokens: number;
    outputTokens: number;
    totalTokens: number;
    inputTokenDetails: {
        noCacheTokens?: number;
        cacheReadTokens?: number;
        cacheWriteTokens?: number;
    };
    outputTokenDetails: {
        textTokens?: number;
        reasoningTokens?: number;
    };
    billableInputTokens?: number;
    billableOutputTokens?: number;
    costUsd?: number;
    providerInputCostUsd?: number;
    providerOutputCostUsd?: number;
    providerCostUsd?: number;
    veryfrontInputChargeUsd?: number;
    veryfrontOutputChargeUsd?: number;
    veryfrontChargeUsd?: number;
    veryfrontBilledUsd?: number;
    costCredits?: number;
    costSource?: "gateway" | "missing" | "partial";
    billingMode?: "direct" | "deferred";
    usageCaptureStatus?: "complete" | "partial" | "missing";
};
/** State for AG-UI runtime chat stream encoder. */
export interface AgUiRuntimeChatStreamEncoderState {
    isStepOpen: boolean;
    finishReason: ChatFinishReason;
    totalUsage: AgUiRuntimeChatStreamUsage | null;
}
/** Public API contract for AG-UI runtime chat stream encoder. */
export interface AgUiRuntimeChatStreamEncoder {
    state: AgUiRuntimeChatStreamEncoderState;
    encode: (event: AgUiRuntimeStreamEvent) => ChatStreamEvent[];
}
/** Options accepted by create AG-UI runtime chat stream encoder. */
export interface CreateAgUiRuntimeChatStreamEncoderOptions {
    responseMessageId: string;
    sendReasoning?: boolean;
    onError?: (error: unknown) => string;
}
/** Create AG-UI runtime chat stream encoder. */
export declare function createAgUiRuntimeChatStreamEncoder(options: CreateAgUiRuntimeChatStreamEncoderOptions): AgUiRuntimeChatStreamEncoder;
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