import { SubjectError } from './subject-shared';
export declare const SUBJECT_ELEMENT_SELECTOR: string;
export type SubjectElement = HTMLElement & {
    toJSON?: () => Promise<any>;
    validate?: () => SubjectError[];
};
export declare function collectSubjectElements(root: ParentNode): SubjectElement[];
export declare function validateSubjectElements(elements: Iterable<SubjectElement>): {
    valid: boolean;
    errors: SubjectError[];
};
export declare function serializeSubjectElements(elements: Iterable<SubjectElement>): Promise<any[]>;