@splidejs/splide/src/js/utils/dom/before/before.ts

Splide is a lightweight, flexible and accessible slider/carousel. No dependencies, no Lighthouse errors.

import { forEach } from '../../array';


/**
 * Inserts a node or nodes before the specified reference node.
 *
 * @param nodes - A node or nodes to insert.
 * @param ref   - A reference node.
 */
export function before( nodes: Node | Node[], ref: Node | null ): void {
  forEach( nodes, node => {
    const parent = ( ref || node ).parentNode;

    if ( parent ) {
      parent.insertBefore( node, ref );
    }
  } );
}