import type { Budget, BudgetStatus, MeterConfig, SpendSummary } from "./types.js";
export declare const WARN_RATIO = 0.8;
/**
 * Build budget statuses from a summary. Session scope is only included when a session spend
 * is supplied (the summary alone doesn't know which session is "current").
 */
export declare function budgetStatuses(summary: SpendSummary, budget?: Budget, opts?: {
    sessionSpent?: number;
}): BudgetStatus[];
/** True when any scope has been exceeded. */
export declare function isOverLimit(statuses: BudgetStatus[]): boolean;
export declare function shouldDownshift(statuses: BudgetStatus[]): boolean;
/** Resolve the cheaper model for an over-budget model from config.downshift (exact then prefix). */
export declare function resolveDownshift(model: string, config?: MeterConfig): string | undefined;