import type { QWElement } from '@qualweb/qw-element';
import { AtomicRule } from '../lib/AtomicRule.object';
declare class QW_ACT_R37 extends AtomicRule {
    execute(element: QWElement): void;
    private isHumanLanguage;
    private evaluateGradient;
    private parseGradientString;
    private getColorInGradient;
    private getTextSize;
    private getBackground;
    private isImage;
    private parseRGBString;
    private flattenColors;
    private getContrast;
    private getLuminance;
    private hasValidContrastRatio;
    private isBold;
    private equals;
}
export { QW_ACT_R37 };
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