/** The part of a fetch response the starter reads. The global `fetch` fits. */
export interface ResponseLike {
    ok: boolean;
    status: number;
    json(): Promise<unknown>;
    text(): Promise<string>;
}
export type FetchLike = (url: string, init?: {
    headers?: Record<string, string>;
    signal?: AbortSignal;
}) => Promise<ResponseLike>;
export declare function isStableTag(tag: string): boolean;
/** Orders stable tags by version number. */
export declare function compareTags(a: string, b: string): number;
/** The highest stable tag in the list, or null when there is none. */
export declare function highestStableTag(names: readonly string[]): string | null;
/** The image tag of a release tag: v2.0.0 becomes 2.0.0. */
export declare function imageTag(ref: string): string;
/**
 * The newest release tag: the latest GitHub release when its tag is a stable vX.Y.Z, otherwise the
 * highest stable vX.Y.Z tag of the repository.
 */
export declare function findLatestRelease(fetchFn: FetchLike, userAgent: string): Promise<string>;