/**
 * Throttle logic for the auto-update check.
 */
export interface PluginUpdateState {
    latestVersion: null | string;
    latestVersionFetchedAt: null | string;
    remindedForVersion: null | string;
}
export interface UpdateCheckState {
    installedVersionAtCheck: null | string;
    lastCheckAt: string;
    lastSuccessAt: null | string;
    latestVersion: null | string;
    latestVersionFetchedAt: null | string;
    plugins: Record<string, PluginUpdateState>;
    remindedForVersion: null | string;
    schemaVersion: 2;
}
/**
 * Returns true when a new update check should run.
 *
 * - First run (lastCheckAt = epoch): yes
 * - lastCheckAt in the future (clock skew): yes
 * - lastCheckAt + frequencyDays <= now: yes
 * - Otherwise: no
 */
export declare function shouldCheckNow(state: UpdateCheckState, frequencyDays: number, now: Date): boolean;
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