import * as i0 from "@angular/core";
/**
 * A common service to facilitate adding structured data to a site.
 * @see https://developers.google.com/search/docs/advanced/structured-data/dataset
 */
export declare class JsonLdService {
    static SCRIPT_TAG_ID: string;
    /** the DOM Document */
    private _document;
    constructor(_document: any);
    /**
     * Remove the existing structured data element from the DOM if it exists.
     */
    remove(): void;
    /**
     * Insert a new structured data script tag in the head of the DOM. This will remove and existing
     * structured data element if it exists.
     *
     * @param schema The contents of the script tag, the structure data schema to insert.
     */
    insert(schema: Record<string, unknown>): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<JsonLdService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<JsonLdService>;
}