/**
 * Boundary physics options used during inertia→spring handoff.
 *
 * - `timeConstantMs` controls exponential decay during the inertia phase.
 * - `restDelta` and `restSpeed` define settle thresholds for both phases.
 * - `bounceStiffness` and `bounceDamping` configure the spring at the boundary.
 */
export type BoundaryPhysics = {
    timeConstantMs: number;
    restDelta: number;
    restSpeed: number;
    bounceStiffness: number;
    bounceDamping: number;
};
/**
 * Derives boundary spring/inertia parameters from drag context.
 *
 * Behavior
 * - If `elastic` is truthy (> 0), use Framer-like defaults: `bounceStiffness=200`, `bounceDamping=40`.
 * - If falsy (`0`/`false`/`undefined`), use extremely large values to overdamp (no visible bounce).
 * - Applies overrides from `transition` (if provided) and maps `timeConstant` (seconds) → `timeConstantMs` (milliseconds).
 *
 * @param {number|undefined} elastic Elasticity value from drag context (`dragElastic`).
 *   Values > 0 indicate elastic overdrag; `0`/`false` disables it.
 * @param {{ bounceStiffness?: number; bounceDamping?: number; timeConstant?: number; restDelta?: number; restSpeed?: number }=} transition
 *   Optional transition overrides (typically from `dragTransition`).
 *   - `timeConstant` is expressed in seconds and internally converted to milliseconds.
 * @returns {BoundaryPhysics} Fully resolved physics parameters for inertia and boundary spring.
 */
export declare const deriveBoundaryPhysics: (elastic: number | undefined, transition?: {
    bounceStiffness?: number;
    bounceDamping?: number;
    timeConstant?: number;
    restDelta?: number;
    restSpeed?: number;
}) => BoundaryPhysics;