import { Reader } from '../../reader';
import { Theme, ThemeEnhancerOutput } from '../theme';
import { Observable } from 'rxjs';
import { SpineItem, SpineItemState } from '../..';
export declare const HTML_PREFIX = "prose-reader-enhancer-loading";
export declare const CONTAINER_HTML_PREFIX = "prose-reader-enhancer-loading-container";
export declare const LOGO_HTML_PREFIX = "prose-reader-enhancer-loading-logo";
export declare const DETAILS_HTML_PREFIX = "prose-reader-enhancer-loading-details";
export declare const createPlaceholderPages: (reader: Reader & {
    theme: ThemeEnhancerOutput;
}) => Observable<({
    item: SpineItem;
} & SpineItemState) | Theme>;