import { Dereferenced, ExtensionKey, PathReference, Refable } from "./common";
/**
 * Returns true if the key starts with `x-`
 */
export declare function isExtensionKey(key: string | ExtensionKey): key is ExtensionKey;
/**
 * Only return properties starting with x-
 * @param dictionary
 */
export declare function includeXDashKeys<T extends Record<string | ExtensionKey, any>>(dictionary: T): Extract<keyof T, ExtensionKey>[];
/**
 * Only return properties NOT starting with x-
 * @param dictionary
 */
export declare function omitXDashKeys<T extends {}>(dictionary: T): Exclude<keyof T, ExtensionKey>[];
export declare function includeXDashProperties<T extends Record<string | ExtensionKey, any> | undefined>(obj: T): T extends undefined ? undefined : Pick<T, Extract<keyof T, ExtensionKey>>;
export declare function omitXDashProperties<T extends {} | undefined>(obj: T): T extends undefined ? undefined : Pick<T, Exclude<keyof T, ExtensionKey>>;
/**
 * Identifies if a given refable is a reference or an instance
 * @param item Check if item is a reference.
 */
export declare function isReference<T extends {} | undefined>(item: Refable<T>): item is PathReference;
/**
 * Gets an object instance for the item, regardless if it's a reference or not.
 * @param document Entire document.
 * @param item Reference item.
 * @param stack Stack for circular dependencies.
 */
export declare function dereference<T extends {} | undefined>(document: any, item: Refable<T>, stack?: string[]): Dereferenced<T>;
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