/**
 * Type asserts that `t` is neither null nor undefined.
 * Throws an error if `t` is null or undefined.
 *
 * @param varName The variable name to include in the error to throw when t is
 *   nil. Defaults to 'value'.
 */
declare function nonNil<T>(t: T | null | undefined, varName?: string): T;

export { nonNil };