import { EvaluationFlag } from '@amplitude/experiment-core';
export declare const isNullOrUndefined: (value: unknown) => boolean;
export declare const isNullUndefinedOrEmpty: (value: unknown) => boolean;
/**
 * Filters out null and undefined values from an object, returning a new object
 * with only defined values. This is useful for config merging where you want
 * defaults to take precedence over explicit null/undefined values.
 */
export declare const filterNullUndefined: <T extends object>(obj: T) => Partial<T>;
export declare const isLocalEvaluationMode: (flag: EvaluationFlag | undefined) => boolean;
export declare const isRemoteEvaluationMode: (flag: EvaluationFlag | undefined) => boolean;