import type { CompletionRequest, CompletionResult, GenerationAttemptHandle, GenerationAttemptInput, GenerationAttemptOutcome, GenerationAttemptUsageSink, TokenUsage } from "../types.js";
export type AttemptUsageValue = {
    readonly kind: "known";
    readonly value: TokenUsage;
} | {
    readonly kind: "unknown";
};
export interface GenerationAttemptRecord extends GenerationAttemptInput {
    readonly sequence: number;
    readonly outcome: GenerationAttemptOutcome;
    readonly usage: AttemptUsageValue;
    readonly statusCode?: number | undefined;
}
export interface OperationUsageAggregate {
    readonly status: "known" | "partial" | "unknown";
    readonly knownAdmissions: number;
    readonly unknownAdmissions: number;
    readonly usage?: TokenUsage | undefined;
}
export interface OperationUsageSnapshot {
    readonly attempts: readonly GenerationAttemptRecord[];
    readonly aggregate: OperationUsageAggregate;
}
export declare function completeGenerationAttempt(outcome: GenerationAttemptOutcome, usage?: TokenUsage, statusCode?: number): void;
export declare function generationFetch(input: string | URL | Request, init?: RequestInit): Promise<Response>;
export declare function runGenerationAttempt(request: CompletionRequest, input: GenerationAttemptInput, run: () => Promise<CompletionResult>): Promise<CompletionResult>;
export declare class OperationUsageRecorder implements GenerationAttemptUsageSink {
    private nextSequence;
    private readonly records;
    begin(input: GenerationAttemptInput): GenerationAttemptHandle;
    snapshot(): OperationUsageSnapshot;
}