import type { BalenaSettingsStorage } from 'balena-settings-storage';
export interface ReleaseTimestampsByVersion {
    [version: string]: string;
    lastFetched: string;
}
export declare class DeprecationChecker {
    protected currentVersion: string;
    readonly majorVersionFetchIntervalDays = 7;
    readonly expiryDays = 365;
    readonly deprecationDays: number;
    readonly msInDay: number;
    readonly debugPrefix = "Deprecation check";
    readonly cacheFile = "cachedReleaseTimestamps";
    readonly now: number;
    private initialized;
    storage: BalenaSettingsStorage;
    cachedTimestamps: ReleaseTimestampsByVersion;
    nextMajorVersion: string;
    constructor(currentVersion: string);
    init(): Promise<void>;
    protected getNpmUrl(version: string): string;
    protected fetchPublishedTimestampForVersion(version: string): Promise<string | undefined>;
    checkForNewReleasesIfNeeded(): Promise<void>;
    warnAndAbortIfDeprecated(): Promise<void>;
    getDeprecationMsg(daysElapsed: number): Promise<string>;
    getExpiryMsg(daysElapsed: number): string;
}