export interface PrereqResult {
    name: string;
    installed: boolean;
    version: string | null;
    minVersion: string;
    satisfied: boolean;
    message: string;
}
export interface PrereqReport {
    results: PrereqResult[];
    allSatisfied: boolean;
    ghAuthenticated: boolean;
    ghUsername: string | null;
    ghProtocol: 'https' | 'ssh' | null;
}
/**
 * Compare two semver strings (e.g. "22.3.0", "18.0.0").
 * Returns 1 if a > b, -1 if a < b, 0 if equal.
 */
export declare function compareVersions(a: string, b: string): number;
/**
 * Check a single command exists and get its version.
 */
export declare function checkCommand(name: string, versionFlag: string, minVersion: string): Promise<PrereqResult>;
/**
 * Check gh CLI authentication status.
 * Runs `gh auth status` and parses the output.
 */
export declare function checkGhAuth(): Promise<{
    authenticated: boolean;
    username: string | null;
    protocol: 'https' | 'ssh' | null;
}>;
/**
 * Attempt to install gh CLI automatically.
 * Returns true if installation succeeded, false otherwise.
 */
export declare function installGhCli(): Promise<{
    installed: boolean;
    message: string;
}>;
/**
 * Attempt to install sops and age automatically.
 * Returns true if both are installed after the attempt.
 */
export declare function installSopsAge(): Promise<{
    installed: boolean;
    message: string;
}>;
/**
 * Ensure age key exists, generate if not present.
 * Returns the public key string.
 */
export declare function ensureAgeKey(): Promise<{
    publicKey: string;
    keyPath: string;
    generated: boolean;
}>;
/**
 * Check all prerequisites and return a combined report.
 */
export declare function checkAllPrereqs(): Promise<PrereqReport>;