import { SpecImage } from "../../specs/specs.js";
import { SpecValidation } from "../spec-validation.js";
import type { ValidationResult } from "../validation-result.js";
import type { PageValidation } from "../page-validation.js";
export interface ImageCompareResult {
    percentage: number;
    totalMismatchPixels: number;
    comparisonMap?: Buffer;
    offsetX: number;
    offsetY: number;
}
export type ImageComparator = (actual: Buffer, expected: Buffer, options: {
    tolerance?: number;
    area?: {
        left: number;
        top: number;
        width: number;
        height: number;
    };
    analyzeOffset?: number;
}) => Promise<ImageCompareResult>;
/**
 * Register a custom image comparator. Must be called before
 * running image spec validation. Accepts any comparison implementation
 * (e.g. pixelmatch, sharp, canvas-based, etc.)
 */
export declare function setImageComparator(comparator: ImageComparator): void;
export declare class SpecValidationImage extends SpecValidation<SpecImage> {
    check(pageValidation: PageValidation, objectName: string, spec: SpecImage): Promise<ValidationResult>;
}
//# sourceMappingURL=validation-image.d.ts.map