import type { SubscribableSignalLike } from '@shopify/ui-extensions/checkout';
/**
 * Creates a mock `SubscribableSignalLike` that wraps a static value.
 * The `subscribe` callback is never invoked since test values are static.
 */
export declare function createSubscribableSignalLike<T>(value: T): SubscribableSignalLike<T>;
/**
 * A minimal read-only signal for surfaces (like POS) that use
 * `ReadonlySignalLike` instead of `SubscribableSignalLike`.
 */
export interface MockReadonlySignalLike<T> {
    readonly value: T;
    subscribe(fn: (value: T) => void): () => void;
}
/**
 * Creates a mock `ReadonlySignalLike` that wraps a static value.
 */
export declare function createReadonlySignalLike<T>(value: T): MockReadonlySignalLike<T>;
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