import { MetaType } from "./common/types";
export default class MetaData {
    private _map;
    private mutationObserver;
    constructor();
    get(key: string | MetaType): string | [string, string][] | undefined;
    set(key: string | MetaType, content?: string | [string, string][]): void;
    has(key: string | MetaType): boolean;
    delete(key: string | MetaType): void;
    clear(): void;
    entries(): IterableIterator<[`name=${string}` | `property=${string}` | `http-equiv=${string}` | `itemprop=${string}` | `charset=${string}`, string | undefined]>;
    [Symbol.iterator](): IterableIterator<[`name=${string}` | `property=${string}` | `http-equiv=${string}` | `itemprop=${string}` | `charset=${string}`, string | undefined]>;
    get size(): number;
    private observeMutations;
    private metaDataFromNode;
    private getMetaKey;
    private getMetaContent;
    private updateMetaElement;
}