import { type AnyFunction } from '@augment-vir/common';
import { type RemoveListenerCallback } from 'typed-event-target';
/**
 * The base shape for an observable. Useful for determining if any object is an observable without
 * using inheritance checks.
 *
 * @category Internal
 */
export declare const observableBaseShape: import("object-shape-tester").Shape<{
    /** Listen to value changes. */
    listen(fireImmediately: boolean, callback: AnyFunction): RemoveListenerCallback;
    /** Free up resources. */
    destroy(): void;
    /** Remove a value change listener. */
    removeListener(listener: AnyFunction): boolean;
    /** The current value. */
    value: import("object-shape-tester").Shape<import("@sinclair/typebox").TUnsafe<unknown>>;
}>;
/**
 * Base observable type.
 *
 * @category Internal
 */
export type ObservableBase = typeof observableBaseShape.runtimeType;
/**
 * Checks if the given value matches the expected base observable shape.
 *
 * @category Internal
 */
export declare function isObservableBase(input: unknown): input is ObservableBase;