export interface FeatureManagerConfig {
    defaultStatus: boolean;
}
export declare type FeatureManagerSettings = Record<string, any>;
export declare class FeatureManager {
    config: FeatureManagerConfig;
    features: Record<string, boolean | FeatureManagerSettings>;
    protected internalSettings: Record<string, FeatureManagerSettings>;
    constructor(config: FeatureManagerConfig);
    /**
     * Determine if a feature is turned off.
     *
     * @param featureKey Key to represent the feature.
     * @returns True if the feature is off or the default is off.
     */
    isOff(featureKey: string): boolean;
    /**
     * Determine if a feature is turned on.
     *
     * @param featureKey Key to represent the feature.
     * @returns True if the feature is on or the default is on.
     */
    isOn(featureKey: string): boolean;
    /**
     * Turn a feature off.
     *
     * @param featureKey Key to represent the feature.
     * @returns false
     */
    off(featureKey: string, settings?: FeatureManagerSettings): FeatureManagerSettings | boolean;
    /**
     * Turn a feature on.
     *
     * @param featureKey Key to represent the feature.
     * @returns true
     */
    on(featureKey: string, settings?: FeatureManagerSettings): FeatureManagerSettings | boolean;
    set(featureKey: string, value: boolean | FeatureManagerSettings): FeatureManagerSettings | boolean;
    settings(featureKey: string): FeatureManagerSettings | undefined;
}