/**
 * Core Knuth-Plass dynamic-programming breakpoint selection.
 */
import type { KPItem, KPOptions } from './types.js';
/** A line's adjustment ratio and the tracking it takes (see
 *  {@link adjustLine}). */
export interface LineAdjustment {
    /** Adjustment ratio of the word spaces once tracking has taken its part. */
    r: number;
    /** Tracking the line takes, px after every character; negative tightens. */
    tracking: number;
    /** Share of the line's tracking capacity it uses (0–1). */
    share: number;
}
/**
 * The adjustment ratio of a line whose content leaves `slack` px against
 * its measure (negative when it runs over), with `stretch` / `shrink` px of
 * word-space give. With `trackingPerChar` set and the line holding at least
 * one word space (`trackable`), the part of the adjustment beyond the
 * limits (a ratio above 1, or below -1) goes into tracking on its `chars`
 * characters, up to `trackingPerChar` each: a loose line's spaces come back
 * to the stretch limit, a tight one fits at the shrink limit. Shared by the
 * breaker and the line reconstruction, so both agree on every line.
 */
export declare function adjustLine(slack: number, stretch: number, shrink: number, chars: number, trackingPerChar: number, trackable: boolean): LineAdjustment;
/**
 * The breaks of a paragraph: the index of the item each line ends at. Set
 * by the Rust line breaker compiled to WebAssembly when it is available
 * (see `wasm/engine.ts`), else by {@link breakpoints}; the two choose the
 * same breaks.
 */
export declare function computeBreakpoints(items: KPItem[], options: KPOptions): number[];
/** {@link computeBreakpoints} in TypeScript: the reference the WebAssembly
 *  breaker is tested against. */
export declare function computeBreakpointsTs(items: KPItem[], options: KPOptions): number[];
//# sourceMappingURL=breakpoints.d.ts.map