import { VecN } from '@holotope/core';
import { type ConstraintRow4 } from './constraint-row4.js';
import { DistanceCoordinate4, type DistanceCoordinate4Options } from './distance-joint4.js';
export type DistanceIntervalState4 = 'inactive' | 'minimum' | 'maximum';
export interface DistanceIntervalConstraint4 extends ConstraintRow4 {
    readonly limit: 'minimum' | 'maximum';
    /** True for a first-order boundary guardian; false for outside-range repair. */
    readonly predictive: boolean;
    readonly anchorA: VecN;
    readonly anchorB: VecN;
    /** Unit direction from anchor B toward anchor A. */
    readonly radialDirection: VecN;
    readonly currentLength: number;
    readonly boundLength: number;
    readonly positionError: number;
    readonly velocityTarget: number;
}
export interface DistanceIntervalEvaluation4 {
    readonly state: DistanceIntervalState4;
    /** Whether observed constant-speed motion crosses the reported bound. */
    readonly predictive: boolean;
    readonly currentLength: number;
    readonly distanceSpeed: number;
    readonly predictedLength: number;
    readonly minLength: number;
    readonly maxLength: number;
}
export type DistanceIntervalJoint4Options = DistanceCoordinate4Options & {
    readonly minLength: number;
    readonly maxLength: number;
};
/** Two-sided R4 distance interval implemented as two unilateral guardian rows. */
export declare class DistanceIntervalJoint4 extends DistanceCoordinate4 {
    readonly minLength: number;
    readonly maxLength: number;
    constructor(options: DistanceIntervalJoint4Options);
    /** Observes current and constant-speed predicted state without emitting rows. */
    interval(dt: number): DistanceIntervalEvaluation4;
    /**
     * Returns both stable unilateral guardian rows. These, rather than the
     * diagnostic `interval()` result, are the solver input: retaining both rows
     * lets later motor/contact updates remain inside the first-order speed window.
     */
    constraints(dt: number): readonly DistanceIntervalConstraint4[];
    private buildConstraint;
    private inactive;
}
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