import { isClient } from '@vueuse/core';
export declare const isFirefox: () => boolean;
export { isClient };
export declare const extend: {
    <T extends {}, U>(target: T, source: U): T & U;
    <T_1 extends {}, U_1, V>(target: T_1, source1: U_1, source2: V): T_1 & U_1 & V;
    <T_2 extends {}, U_2, V_1, W>(target: T_2, source1: U_2, source2: V_1, source3: W): T_2 & U_2 & V_1 & W;
    (target: object, ...sources: any[]): any;
};
export declare const inBrowser: boolean;
export type Numeric = number | string;
export declare function isMobile(value: string): boolean;
export declare const isIOS: () => boolean;