declare type Options = {
    /** An iterable list of values that are "true" */
    trueValues?: Iterable<string | RegExp>;
    /** An iterable list of values that are "true" */
    falseValues?: Iterable<string | RegExp>;
};
/**
 * Convert a string to a boolean value
 *
 * @param input The string to convert
 * @parm __namedParameters see {@link Options}
 * @defaults trueValues 'true', 'yes', 'y', 'on', or '1'
 * @defaults falseValues 'false', 'no', 'n', 'off', '0'
 */
export declare function toBoolean(input: string, { trueValues, falseValues }?: Options): boolean | undefined;
export default toBoolean;