import { ObjectLike } from "../types";
/**
 * -----------------------------------------------------------------------------
 * Types
 * -----------------------------------------------------------------------------
 */
export declare type LanguageMap = {
    "@none"?: string;
    [language: string]: string | undefined;
};
export declare type LanguageSetMap = {
    "@none"?: LanguageSet;
    [language: string]: LanguageSet | undefined;
};
export declare type LanguageSet = Set<string>;
export declare type LanguageOfConditionalReturn<SubjectObject extends ObjectLike, Key extends keyof SubjectObject> = NonNullable<SubjectObject[Key]> extends Array<unknown> ? LanguageSetMap : LanguageMap;
/**
 * -----------------------------------------------------------------------------
 * Functions
 * -----------------------------------------------------------------------------
 */
/**
 *
 * @param subject
 * @param predicate
 * @returns
 */
export declare function languagesOf<SubjectObject extends ObjectLike, Key extends keyof SubjectObject>(subjectObject: SubjectObject, key: Key): LanguageOfConditionalReturn<SubjectObject, Key>;