import type { AnyReadableSignal, AnyAccessor, AnyFn } from './internals/types.js';
/**
 * Check if value is function
 * @param value
 * @returns True if value is function
 */
export declare function isFunction(value: unknown): value is AnyFn;
/**
 * Check if value is accessor
 * @param value
 * @returns True if value is accessor
 */
export declare const isAccessor: <T extends AnyAccessor = AnyAccessor>(value: unknown) => value is T;
/**
 * Check if the value is an signal.
 * @param value
 * @returns Whether the value is an signal.
 */
export declare function isSignal<T extends AnyReadableSignal = AnyReadableSignal>(value: unknown): value is T;
export declare function noop(): void;
export declare function identity<T>(value: T): T;
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