/**
 * Cart / customer id shapes — pure, no I/O.
 *
 * Shopify's cart id is `gid://shopify/Cart/<token>?key=<key>`. Everything on the Apptile side — the
 * customer metafield, the dashboard — stores the part after `Cart/`, **including** the `?key=`:
 * without that key the cart cannot be read back or mutated.
 */
/** GID → token (the part after `Cart/`, key included). Passes a bare token through unchanged. */
export declare function toCartToken(cartId: string | null | undefined): string | null;
/** Token → GID. Passes an existing GID through unchanged. */
export declare function toCartGid(token: string | null | undefined): string | null;
/** The backend keys the customer by number, not by GID. */
export declare function toNumericCustomerId(customerGid: string | null | undefined): string | null;
/** Only a token carrying its access key can be mutated by the merge service. */
export declare function isMergeable(token: string | null): token is string;
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