/**
 * Append an element to the head of the document if not already added
 *
 * @param type - The type of element to append (e.g. 'link', 'script')
 * @param attrs - The attributes to set on the element. Tip: use innerHTML to set content
 */
export declare function appendElement(type: string, attrs: Record<string, string>): void;
export declare namespace appendElement {
    var cache: Set<unknown>;
}
/**
 * Append a link element to the head of the document if not already added
 *
 * @param attrs - The attributes, excluding rel, to set on the element
 */
export declare function appendLink(attrs: Record<string, string>): void;
/**
 * Append a style element to the head of the document if not already added
 *
 * @param attrs - The attributes, excluding rel, to set on the element. Tip: use innerHTML to set content
 */
export declare function appendStyle(attrs: Record<string, string>): void;
/**
 * Append a script element to the head of the document if not already added
 *
 * @param attrs - The attributes to set on the element. Tip: use innerHTML to set content
 */
export declare function appendScript(attrs: Record<string, string>): void;