export declare class NuxtMultiCacheRouteCacheHelper {
    /**
     * The collected cache tags.
     */
    tags: string[];
    /**
     * Indicates if the route should be cacheable.
     */
    cacheable: boolean | null;
    /**
     * The maximum age.
     */
    maxAge: number | null;
    /**
     * The stale if error age.
     */
    staleIfError: number | null;
    /**
     * Whether a stale response can be served during revalidation.
     */
    staleWhileRevalidate: boolean | null;
    /**
     * Add cache tags for this route.
     */
    addTags(tags?: string[]): NuxtMultiCacheRouteCacheHelper;
    /**
     * Mark this route as cacheable.
     *
     * The initial value is null and this method only changes the value if it is
     * null. This means that once it's set to uncacheable, there is no way to
     * change it back.
     */
    setCacheable(): NuxtMultiCacheRouteCacheHelper;
    /**
     * Mark the route as uncacheable.
     *
     * After that there is no way to make it cacheable again.
     */
    setUncacheable(): NuxtMultiCacheRouteCacheHelper;
    /**
     * Set a numeric value only if its smaller than the existing value.
     */
    setNumeric(property: keyof Pick<NuxtMultiCacheRouteCacheHelper, 'maxAge' | 'staleIfError'>, value: number): NuxtMultiCacheRouteCacheHelper;
    /**
     * Set the max age in seconds.
     *
     * The value is only set if it's smaller than the current max age or if it
     * hasn't been set yet. The initial value is `null`.
     *
     * You can always directly set the maxAge property on this object.
     */
    setMaxAge(v?: number): NuxtMultiCacheRouteCacheHelper;
    /**
     * Set the staleIfError in seconds.
     *
     * If set, then a stale route will be served if that refreshed route throws an error.
     */
    setStaleIfError(v?: number): NuxtMultiCacheRouteCacheHelper;
    /**
     * Sets whether a stale respones can be returned while a new one is being generated.
     */
    allowStaleWhileRevalidate(): NuxtMultiCacheRouteCacheHelper;
    /**
     * Get the expire timestamp as unix epoch (seconds).
     */
    getExpires(property: keyof Pick<NuxtMultiCacheRouteCacheHelper, 'maxAge' | 'staleIfError'>): number | undefined;
}