import type { LoadingManager } from "./LoadingManager.ts";
/** Abstract base loader. */
export declare class Loader {
    #private;
    constructor(manager?: LoadingManager | undefined);
    get manager(): LoadingManager | undefined;
    get path(): string;
    get crossOrigin(): string;
    get requestHeader(): Record<string, string>;
    setPath(path: string): this;
    setCrossOrigin(crossOrigin: string): this;
    setRequestHeader(requestHeader: Record<string, string>): this;
    /**
     * Abstract - subclasses override.
     */
    load(_url: string, _onLoad: ((data: unknown) => void) | undefined, _onProgress: ((event: ProgressEvent) => void) | undefined, _onError: ((err: unknown) => void) | undefined): void;
    /**
     * Promise-based wrapper around load().
     */
    loadAsync(url: string, onProgress?: (event: ProgressEvent) => void): Promise<unknown>;
}
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