interface DefaultTo {
    <T>(a: T, b: null | undefined): T;
    <T, U>(a: T, b: U): U;
    <T>(a: T): {
        (b: null | undefined): T;
        <U>(b: U): U;
    };
}
/**
 * Returns the second argument if it is not `null`, `undefined` or `NaN`
 * otherwise the first argument is returned.
 *
 * @param {a} dflt The default value.
 * @param {b} x The value to return if it is not null or undefined
 * @return {*} The the second value or the default value
 * @example
 *
 *      var defaultTo42 = defaultTo(42);
 *
 *      defaultTo42(null);  //=> 42
 *      defaultTo42(undefined);  //=> 42
 *      defaultTo42('Example');  //=> 'Example'
 *      defaultTo42(parseInt('string')); //=> 42
 */
declare const _default: DefaultTo;
export default _default;