/**
 * Type for Angular boolean directives, e.g.
 * <ui-badge compact></ui-badge>
 *
 * Alternative forms:
 * <ui-badge compact="true"></ui-badge>
 * <ui-badge compact="false"></ui-badge>
 * <ui-badge [compact]="true"></ui-badge>
 * <ui-badge [compact]="false"></ui-badge>
 */
export declare type BooleanDirectiveType = undefined | boolean | 'true' | 'false' | '';
/**
 * Convert value of BooleanDirectiveType into strict boolean
 */
export declare function BooleanDirectiveValue(value: BooleanDirectiveType): boolean;