import { Failure } from '../base';
import { GenericValidator, GenericValidatorConstructorParams } from './genericValidator';
/**
 * Parameters used to construct a {@link Validation.Classes.BooleanValidator | BooleanValidator}.
 * @public
 */
export type BooleanValidatorConstructorParams<TC = unknown> = GenericValidatorConstructorParams<boolean, TC>;
/**
 * An in-place {@link Validation.Validator | Validator} for `boolean` values.
 * @public
 */
export declare class BooleanValidator<TC = unknown> extends GenericValidator<boolean, TC> {
    /**
     * Constructs a new {@link Validation.Classes.BooleanValidator | BooleanValidator}.
     * @param params - Optional {@link Validation.Classes.BooleanValidatorConstructorParams | init params} for the
     * new {@link Validation.Classes.BooleanValidator | BooleanValidator}.
     */
    constructor(params?: BooleanValidatorConstructorParams<TC>);
    /**
     * Static method which validates that a supplied `unknown` value is a `boolean`.
     * @param from - The `unknown` value to be tested.
     * @returns Returns `true` if `from` is a `boolean`, or {@link Failure} with an error
     * message if not.
     */
    static validateBoolean(from: unknown): boolean | Failure<boolean>;
}
//# sourceMappingURL=boolean.d.ts.map