/**
 * Where a per-service cap sits between what the plan keeps and what it moves.
 *
 * Both figures are the container's statements at their busiest window, in
 * the unit the cap is written in. The cap sits at the geometric mean of the
 * largest kept statement and the smallest moved one, so each side has the
 * same ratio of margin: the kept statement can grow by that factor before it
 * is held, and the moved one is that factor above the limit. When the
 * smallest moved statement is no busier than the largest kept one, no cap
 * separates them; the cap stays at the largest kept statement and the plan
 * says so.
 */
export interface ServiceCapPlacement {
    /** The cap, in the unit of its inputs. */
    cap: number;
    keptMax: number;
    movedMin?: number;
    /** True when the cap sits strictly between the two. */
    separated: boolean;
    /** cap / keptMax, which equals movedMin / cap, when separated. */
    margin?: number;
}
export declare function placeServiceCap(keptMax: number, movedMin: number | undefined): ServiceCapPlacement;
/** "1.6x", no trailing zero. */
export declare function fmtMargin(m: number): string;
/**
 * The margin in the reader's terms, one sentence per service, or undefined
 * when the service keeps nothing or moves nothing.
 */
export declare function marginSentence(service: string, p: Pick<ServiceCapPlacement, 'separated' | 'margin' | 'keptMax' | 'movedMin'>, keptNoun: string): string | undefined;