export declare const CURRENCY_PACKAGE = "@younndai/lyt";
export declare const CURRENCY_DIST_TAG = "alpha";
export declare const UPDATE_CHANNELS: readonly ["alpha", "latest"];
export type UpdateChannel = (typeof UPDATE_CHANNELS)[number];
export declare const CURRENCY_CACHE_TTL_MS: number;
export type CommandRunner = (command: string, args: string[]) => string | null;
export interface CurrencyResult {
    status: "ok" | "offline" | "channel-unconfigured";
    installed: string;
    channel: UpdateChannel | null;
    channelSource: "explicit" | "persisted" | "unconfigured";
    registry: string;
    packageName: string;
    observedTag: UpdateChannel | null;
    latest: string | null;
    integrity: string | null;
    stale: boolean;
    aheadOfChannel: boolean;
    offline: boolean;
    channelUnconfigured: boolean;
    fromCache: boolean;
    checkedAt: string;
    nextAction?: string;
}
export interface CurrencyOptions {
    force?: boolean;
    installedVersion?: string;
    runner?: CommandRunner;
    channel?: UpdateChannel;
    registryUrl?: string;
    packageName?: string;
    ttlMs?: number;
    now?: () => number;
    homeDir?: string;
    cacheOnly?: boolean;
}
export interface UpdateChannelPreference {
    schemaVersion: 1;
    channel: UpdateChannel;
}
interface CurrencyObservation {
    registry: string;
    packageName: string;
    channel: UpdateChannel;
    observedTag: UpdateChannel;
    version: string;
    integrity: string;
    checkedAt: string;
}
export interface CurrencyStateInspectionV1 {
    readonly channel: UpdateChannel | null;
    readonly channelStatus: "current" | "missing" | "malformed";
    readonly cacheStatus: "current" | "missing" | "malformed" | "tampered" | "stale";
    readonly observation: Readonly<CurrencyObservation> | null;
}
export declare function isUpdateChannel(value: string): value is UpdateChannel;
export declare function normalizeRegistryUrl(value: string | undefined): string;
export declare function readUpdateChannel(opts?: Pick<CurrencyOptions, "homeDir">): UpdateChannel | null;
export declare function writeUpdateChannel(channel: UpdateChannel, opts?: Pick<CurrencyOptions, "homeDir">): void;
export declare function inspectCurrencyStateV1(opts?: CurrencyOptions): CurrencyStateInspectionV1;
export declare function isNewerVersion(candidate: string, base: string): boolean;
export declare function checkCurrency(opts?: CurrencyOptions): Promise<CurrencyResult>;
export declare function updateCommandString(channel?: UpdateChannel): string;
export type UpdateAction = {
    kind: "channel-unconfigured";
    message: string;
    nextAction: string;
} | {
    kind: "offline";
    message: string;
} | {
    kind: "ahead-of-channel";
    message: string;
} | {
    kind: "current";
    message: string;
} | {
    kind: "needs-confirm";
    message: string;
} | {
    kind: "blocked-noninteractive";
    message: string;
} | {
    kind: "proceed";
    message: string;
};
export declare function resolveUpdateAction(result: CurrencyResult, opts?: {
    yes?: boolean;
    interactive?: boolean;
    allowDowngrade?: boolean;
}): UpdateAction;
export declare function formatCurrencyLine(result: CurrencyResult): string;
export {};
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