import type { RuntimeKind } from './types.js';
export declare function canFallbackRuntimeDownload(error: unknown): boolean;
export declare function resolveExpectedChecksum(params: {
    runtime: 'node' | 'uv';
    checksumUrl: string;
    archiveFile: string;
    timeoutMs: number;
    proxy?: string;
    signal?: AbortSignal;
}): Promise<string>;
export declare function sha256File(path: string): Promise<string>;
export declare function downloadVerifiedArchive(params: {
    runtime: RuntimeKind;
    url: string;
    targetPath: string;
    expectedSha256: string;
    timeoutMs: number;
    proxy?: string;
    signal?: AbortSignal;
    onProgress?: (downloadedBytes: number, totalBytes?: number) => void;
}): Promise<string>;