import type { AnySignal, ReadableSignal, Mountable, AnyWritableSignal, AnyAccessor, AccessorValue } from './internals/types.js';
export declare function isMountable<T extends Mountable<AnySignal> = Mountable<AnySignal>>(value: AnyAccessor): value is T;
export declare function unsafeMarkMountable($signal: AnySignal): void;
/**
 * Mark a signal as mountable.
 * @param $signal
 * @returns The mountable signal.
 */
export declare function mountable<T extends AnySignal>($signal: T): Mountable<T>;
export declare function isWritable<T extends AnyWritableSignal = AnyWritableSignal>(value: AnyAccessor): value is T;
export declare function unsafeMarkWritable($signal: AnySignal): void;
/**
 * Mark a signal as readonly.
 * @param $signal
 * @returns The readonly signal.
 */
export declare function readonly<T extends AnyAccessor>($signal: T): T extends Mountable<AnyWritableSignal> ? Mountable<ReadableSignal<AccessorValue<T>>> : T extends AnyWritableSignal ? ReadableSignal<AccessorValue<T>> : T;
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