/**
 * Returns true if the specified object looks like a JavaScript Error object.
 */
export declare function isErrorObj(err: any): err is Error;
/**
 * Returns true if the specified value is "thenable" (aka a Promise).
 */
export declare function isPromise<T>(value: any): value is Promise<T>;
/**
 * Simple helper function to find the @Release decorated method of an object (if any), and invoke it.
 * This is primarily an internal method as you probably know the exact method, and should invoke it yourself.
 * async-injection uses this helper to allow Singletons to clean up any non-garbage-collectable resources they may have allocated.
 */
export declare function InvokeReleaseMethod<T = unknown>(obj: T): boolean;