export declare const isArray: (arg: any) => arg is any[];
export declare const isString: (val: unknown) => boolean;
export declare const isFunction: (val: unknown) => val is Function;
export declare const extend: {
    <T, U>(target: T, source: U): T & U;
    <T_1, U_1, V>(target: T_1, source1: U_1, source2: V): T_1 & U_1 & V;
    <T_2, 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 camelize: (str: string) => string;
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