export declare function checkForDesktopUpdate(options: CheckDesktopUpdateOptions): Promise<DesktopUpdateManifest | null>;
export declare function stageDesktopUpdate(manifest: DesktopUpdateManifest, destination: string, fetcher?: DesktopFetcher, trustedKeys?: Record<string, string>): Promise<StagedDesktopUpdate>;
export declare function compareVersions(left: string, right: string): number;
export declare function validateUpdateManifest(input: unknown): DesktopUpdateManifest;
export declare function updateManifestPayload(manifest: DesktopUpdateManifest): Buffer;
export declare function verifyUpdateManifestSignature(manifest: DesktopUpdateManifest, trustedKeys: Record<string, string>): void;
export declare interface DesktopUpdateManifest {
  version: string
  url: string
  sha256: string
  size: number
  sourceRevision: string
  platform: string
  architecture: string
  signingKeyId: string
  signature: string
  publishedAt?: string
  notes?: string
}
export declare interface CheckDesktopUpdateOptions {
  currentVersion: string
  manifestUrl: string
  trustedKeys: Record<string, string>
  fetcher?: DesktopFetcher
}
export declare interface StagedDesktopUpdate {
  manifest: DesktopUpdateManifest
  path: string
  bytes: number
}
export type DesktopFetcher = (input: string | URL | Request, init?: RequestInit) => Promise<Response>;