/** Tracks loading state across multiple assets. */
export declare class LoadingManager {
    #private;
    constructor(onLoad?: () => void, onProgress?: (url: string, loaded: number, total: number) => void, onError?: (url: string) => void);
    get isLoading(): boolean;
    itemStart(_url: string): void;
    itemEnd(url: string): void;
    itemError(url: string): void;
    /**
     * Returns url as-is. Override for path resolution.
     */
    resolveURL(url: string): string;
}
/** Shared default LoadingManager instance. */
export declare const DefaultLoadingManager: LoadingManager;
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