import { type Observer, type Reference } from "@knyt/artisan";
import type { ReactiveController, ReactiveControllerHost } from "./ReactiveController.ts";
/**
 * @alpha This is an experimental API. It will change in future versions.
 */
export declare class FontFaceInclusionController implements ReactiveController, Observer<Document | null> {
    #private;
    constructor(host: ReactiveControllerHost, { ownerDocument, }: {
        ownerDocument: Reference.Maybe<Document>;
    });
    hostConnected?: () => void;
    next(ownerDocument: Document | null): void;
    /**
     * Adds the given style fontFace to the included font faces.
     * If the style fontFace is already present, this is a no-op.
     */
    includeFontFace(fontFace: FontFace): void;
    /**
     * Removes the first occurrence of the given style fontFace from the adopted
     * style sheets.
     */
    removeFontFace(fontFace: FontFace): void;
}
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