import React from 'react';
type ValueOf<T> = T[keyof T];
type KeysWithValueType<Obj, ValueType> = {
    [Key in keyof Obj]: Obj[Key] extends ValueType ? Key : never;
}[keyof Obj & string];
type PrefixKeys<T, Prefix extends string> = {
    [K in keyof T as `${Prefix}${Extract<K, string>}`]: T[K];
};
declare function getInitials(name: string): string;
declare function getKey(prefix: string, suffix: string | number): string;
declare function hasClass(allClasses: string | undefined, className: string): boolean;
declare function isIE11(): boolean;
declare function warnIfOverwriting<Props>(props: Props, propertyName: keyof Props, componentName: string): void;
declare function withKey(element: React.ReactElement, prefix: string, suffix: string | number): React.ReactNode;
declare function mergeRefs<T>(refs: Array<React.MutableRefObject<T> | React.LegacyRef<T> | undefined>): React.RefCallback<T>;
declare function sleep(ms: number): Promise<undefined>;
export { getInitials, getKey, hasClass, isIE11, mergeRefs, warnIfOverwriting, withKey, sleep, type ValueOf, type KeysWithValueType, type PrefixKeys, };
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