import { UILayer } from "../layers/UILayer/UILayer";
/**
 * Validates value is finite number within safe range.
 * @param value Number to validate
 * @param subject Value name for error messages
 * @throws If value is not finite or exceeds safe range
 */
export declare function assertValidNumber(value: number, subject: string): void;
/**
 * Validates value is positive (>= EPSILON).
 * @param value Number to validate
 * @param subject Value name for error messages
 * @throws If value is invalid or below EPSILON
 */
export declare function assertValidPositiveNumber(value: number, subject: string): void;
/**
 * Validates value is non-negative (>= 0).
 * @param value Number to validate
 * @param subject Value name for error messages
 * @throws If value is invalid or negative
 */
export declare function assertValidNonNegativeNumber(value: number, subject: string): void;
/**
 * Validates constraint arguments are from same layer.
 * @param a First constraint subject
 * @param b Second constraint subject
 * @param subject Constraint name for error messages
 * @returns Common layer for both subjects
 * @throws If subjects are invalid or from different layers
 */
export declare function assertValidConstraintArguments(a: unknown, b: unknown, subject: string): UILayer;
/**
 * Validates interpolation constraint subjects.
 * @param subject Constraint name for error messages
 * @param a First element
 * @param b Second element
 * @param c Element to interpolate
 * @param anchorA Anchor on element A
 * @param anchorB Anchor on element B
 * @returns Common layer for all subjects
 * @throws If subjects violate interpolation constraints
 */
export declare function assertValidInterpolationConstraintArguments(subject: string, a: unknown, b: unknown, c: unknown, anchorA: number, anchorB: number): UILayer;