/**
 * Opaque instance lookup shared by idempotent registration records.
 */
export type EditorInstanceLookup = (ownershipKey: object) => object | null;
/**
 * Stores the single active editor associated with an ownership identity.
 *
 * @param ownershipKey - Stable object identity exposed by the host.
 * @param editor - Editor instance that owns the identity.
 * @throws EditorAlreadyInitializedError when another active instance exists.
 */
export declare function storeEditorInstance(ownershipKey: object, editor: object): void;
/**
 * Retrieves an editor through the identity that originally stored it.
 *
 * This is the single internal boundary at which the generic instance type is
 * recovered from the intentionally opaque WeakMap.
 *
 * @param ownershipKey - Stable object identity exposed by the host.
 * @returns The active editor, or null when the identity has none.
 */
export declare function getEditorInstance(ownershipKey: object): object | null;
/**
 * Deletes an instance only when the caller still owns the stored identity.
 *
 * @param ownershipKey - Stable object identity exposed by the host.
 * @param editor - Editor that expects to own the identity.
 * @returns Whether the stored identity was removed.
 */
export declare function deleteEditorInstance(ownershipKey: object, editor: object): boolean;