export declare function isEmpty(val: unknown): boolean;
export declare function difference<Item>(arr1: Item[], arr2: Item[]): Item[];
export declare function pick<Obj extends Record<string, unknown>, K extends keyof Obj>(object?: Obj, ...keys: K[]): {
    [P in K]: Obj[P];
};
/**
 * @example
 * type foo = CamelCase<"foo"> // => "foo"
 * type foo_bar = CamelCase<"foo_bar"> // =>"fooBar"
 * type foo_bar_baz = CamelCase<"foo_bar_baz"> // => "fooBarBaz"
 */
export type CamelCase<S extends string> = S extends `${infer T}_${infer U}` ? `${Lowercase<T>}${Capitalize<CamelCase<U>>}` : Lowercase<S>;
export declare function camelCase<S extends string>(string: S): CamelCase<S>;
export declare function snakeCase(string: string): string;