export declare function findDeepFirst<T extends {
    items?: T[];
}>(list: T[], cb: (item: T) => boolean): T | undefined;
export declare function toStringIfDefined(value: unknown): string | undefined;
/**
 * Returns true when the function executed in browser.
 */
export declare function isBrowser(): boolean;
export declare function isPlainObject(obj: unknown): boolean;
/**
 * Returns the previous and next values in an array for a given index.
 *
 * Edge cases:
 * - If the index is `0`, `prev` will be `null`.
 * - If the index is the last position in the array, `next` will be `null`.
 * - If the index is out of bounds (negative or greater than the last index), both `prev` and `next` will be `null`.
 *
 * @example
 * const array = [10, 20, 30, 40];
 * getAdjacentValues(array, 2);
 * // returns: { prev: 20, next: 40 }
 *
 * getAdjacentValues(array, 0);
 * // returns: { prev: null, next: 20 }
 *
 * getAdjacentValues(array, 3);
 * // returns: { prev: 30, next: null }
 *
 * getAdjacentValues(array, -1);
 * // returns: { prev: null, next: null }
 *
 * getAdjacentValues(array, 4);
 * // returns: { prev: null, next: null }
 */
export declare function getAdjacentValues<T>(array: T[], index: number): {
    prev: T | null;
    next: T | null;
};
/**
 * Inserts an element at a given index in an array. Returns a new array with the element inserted.
 *
 * @example
 * const array = [10, 20, 30, 40];
 * insertAt(array, 2, 25);
 * // returns: [10, 20, 25, 30, 40]
 */
export declare function insertAt<T>(array: T[], index: number, newElement: T): T[];
/**
 * Removes an element from an array. Returns a new array with the element removed.
 *
 * @example
 * const array = [10, 20, 30, 40];
 * removeElement(array, 20);
 * // returns: [10, 30, 40]
 */
export declare function removeElement<T>(array: T[], item: T): T[];