fem_tutos/node_modules/dom-helpers/cjs/attribute.d.ts

/**
 * Gets or sets an attribute of a given element.
 *
 * @param node the element
 * @param attr the attribute to get or set
 * @param val the attribute value
 */
export default function attribute(node: Element | null, attr: string, val?: string | boolean | null): string | null | undefined;