import type { PhysicsBackend } from "./physicsBackend.js";
/** The slice of a test runner the conformance suite needs; `bun:test` satisfies it directly. */
export interface ConformanceHarness {
    test(name: string, run: () => void): void;
    expect(value: unknown): {
        toBe(expected: unknown): void;
        toBeNull(): void;
        not: {
            toBeNull(): void;
            toBe(expected: unknown): void;
        };
        toBeGreaterThan(expected: number): void;
        toBeLessThan(expected: number): void;
        toBeCloseTo(expected: number, digits?: number): void;
        toEqual(expected: unknown): void;
        toContain(expected: unknown): void;
    };
}
/**
 * Behavioral contract every {@link PhysicsBackend} must pass: bodies rest on floors, casts and rays report the
 * first surface with an outward normal, kinematic targets produce velocity, masks filter, and snapshot/restore
 * round-trips with stable handles. Backends declare what they cannot do through `capabilities`; the suite reads it.
 * Expects `create()` to return a fresh backend whose world spans at least ±50 on every axis with a floor at y=0.
 *
 * @capability physics-backend-conformance the shared test contract a physics adapter runs to prove it matches the seam
 */
export declare function runPhysicsBackendConformance(create: () => PhysicsBackend, harness: ConformanceHarness): void;