/**
 * Cache strategy for variable collection.
 * Controls how often a variable is re-collected.
 */
export declare enum CacheStrategy {
    /** Re-collect every 10 seconds */
    FAST = 10000,
    /** Re-collect every 1 minute */
    MEDIUM = 60000,
    /** Re-collect every 5 minutes */
    SLOW = 300000,
    /** Collect once per session (never expires while SDK is alive) */
    HEAVY = 9007199254740991
}
export interface VariableCollectionMetadata {
    strategy: CacheStrategy;
    lastCollected?: number;
}