export type UpdateChannel = 'stable' | 'beta' | 'dev';
export declare const DEFAULT_PACKAGE_CHANNEL: UpdateChannel;
export declare const DEFAULT_GIT_CHANNEL: UpdateChannel;
/**
 * Map update channel to the npm dist-tag used for querying registry.
 * stable → latest, beta → beta, dev → dev
 */
export declare function channelToNpmTag(channel: UpdateChannel): string;
/** Normalize a user-provided string to a valid UpdateChannel, or null. */
export declare function normalizeUpdateChannel(value?: string | null): UpdateChannel | null;
/** Return true if a version/tag string contains a beta prerelease identifier. */
export declare function isBetaVersion(version: string): boolean;
/** Return true if a version string is a stable release (no beta marker in this heuristic). */
export declare function isStableVersion(version: string): boolean;