import type { BivariantCallable, BivariantNewable } from './Bivariant/index.js';
export declare function isFunction(x: unknown): x is BivariantCallable<(...args: unknown[]) => unknown> | BivariantNewable<abstract new (...args: unknown[]) => unknown>;
/**
 * Warning: use `isFunction` if possible - this does not do any additional
 * checks, but type-casts instead
 */
export declare function isCallable(x: unknown): x is BivariantCallable<(...args: unknown[]) => unknown>;
/** Checks for `[[Construct]]` */
export declare function isNewable(x: unknown): x is BivariantNewable<abstract new (...args: unknown[]) => unknown>;
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