import type { Customer, RenderExtensionPoint } from '@shopify/checkout-ui-extensions';
/**
 * Returns the current `Customer`.
 *
 * The value is `undefined` if the buyer isn't a known customer for this shop or if they haven't logged in yet.
 */
export declare function useCustomer<ID extends RenderExtensionPoint = RenderExtensionPoint>(): Customer | undefined;
/**
 * Returns the email address of the buyer that is interacting with the cart.
 * The value is `undefined` if the app does not have access to customer data.
 */
export declare function useEmail<ID extends RenderExtensionPoint = RenderExtensionPoint>(): string | undefined;
/**
 * Returns the phone number of the buyer that is interacting with the cart.
 * The value is `undefined` if the app does not have access to customer data.
 */
export declare function usePhone<ID extends RenderExtensionPoint = RenderExtensionPoint>(): string | undefined;
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