import { Integrator, IntegratorState } from './types';
export interface LinearIntegratorConfig {
    /** Wall-clock duration, in seconds, the integrator should take to traverse
     * its full range. The simulation steps at FRAME_TIME (1/60s) and accumulates
     * position linearly until it crosses the target. */
    durationSec: number;
}
/**
 * Constant-velocity integrator.
 *
 * Useful when the curve isn't physical — e.g. a pre-baked multi-spring
 * timeline is being replayed through `WebAnimation`'s style function. The
 * style function gets `t ∈ [0,1]` evolving linearly over `durationSec`, then
 * looks up the baked frame data. The visible curve still comes from the bake;
 * the integrator is just driving the clock.
 */
export declare class LinearIntegrator implements Integrator {
    private durationSec;
    constructor(config: LinearIntegratorConfig);
    step(state: IntegratorState, target: number, dt: number): IntegratorState;
    isSettled(state: IntegratorState, target: number): boolean;
}
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