/**
 * A light weight implementation of feature flags to conditionally enable
 * experimental and legacy features.
 *
 * @template FlagsList - Type definition for the feature flags object
 *
 * @example
 * const flags = new FeatureFlags({ newUI: true, betaFeature: false })
 * if (flags.enabled('newUI')) {
 *   // Enable new UI
 * }
 *
 * @example
 * const dynamicFlags = new FeatureFlags(() => getConfigFlags())
 * flags.when('betaFeature',
 *   () => console.log('Beta enabled'),
 *   () => console.log('Beta disabled')
 * )
 */
export declare class FeatureFlags<FlagsList extends Record<any, any>> {
    #private;
    /**
     * Creates a new FeatureFlags instance
     *
     * @param flags - Either a static flags object or a factory function
     */
    constructor(flags: FlagsList | (() => FlagsList));
    /**
     * Checks if a feature is enabled
     *
     * @param feature - The feature name to check
     * @returns boolean - True if the feature is enabled
     */
    enabled<Feature extends keyof FlagsList | (string & {})>(feature: Feature): boolean;
    /**
     * Checks if a feature is disabled
     *
     * @param feature - The feature name to check
     * @returns boolean - True if the feature is disabled
     */
    disabled<Feature extends keyof FlagsList | (string & {})>(feature: Feature): boolean;
    /**
     * Checks if a feature exists in the flags
     *
     * @param feature - The feature name to check
     * @returns boolean - True if the feature exists
     */
    has<Feature extends keyof FlagsList | (string & {})>(feature: Feature): boolean;
    /**
     * Conditionally executes callbacks based on feature flag state
     *
     * @param feature - The feature name to check
     * @param enabledCallback - Callback to execute when feature is enabled
     * @param disabledCallback - Optional callback to execute when feature is disabled
     * @returns The result of the executed callback
     */
    when<Feature extends keyof FlagsList | (string & {}), EnabledResult, DisabledResult>(feature: Feature, enabledCallback: () => EnabledResult, disabledCallback?: () => DisabledResult): [never] extends DisabledResult ? EnabledResult | undefined : EnabledResult | DisabledResult;
}