export interface IText {
    nodeValue: string | null;
}
export interface IElement {
    readonly tagName: string;
    childNodes: {
        length: number;
        [index: number]: IElement | IText;
    };
    toString: () => string;
}
/**
 * Decode an XML string.
 *
 * @param xml XML string.
 * @returns Decoded declaration, doctype, and document element.
 */
export declare function xmlDecode(xml: string): {
    declaration: string | null;
    doctype: string | null;
    documentElement: Readonly<IElement>;
};
/**
 * List XML element child elements.
 * Throws if non-whitespace nodes are found.
 *
 * @param element XML element.
 * @returns XML element list.
 */
export declare function xmlElementChildElements<T extends Readonly<IElement>>(element: T): T[];
/**
 * Get the XML element text node.
 * Returns null if none, throws if multiple elements.
 *
 * @param element XML element.
 * @returns XML text node list.
 */
export declare function xmlElementText(element: Readonly<IElement>): IText | null;
/**
 * Assert XML element has no children.
 *
 * @param element XML element.
 * @param tagName XML element tag name.
 */
export declare function assertXmlTagName(element: Readonly<IElement>, tagName: string): void;
/**
 * Assert XML element has no children.
 *
 * @param element XML element.
 */
export declare function assertNoXmlElementChildNodes(element: Readonly<IElement>): void;
/**
 * Base64 encode function mirroring decode function.
 *
 * @param data Byte array.
 * @returns Base64 string.
 */
export declare function base64Encode(data: Uint8Array): string;
/**
 * Base64 decode function that matches plist parsing behavior.
 *
 * @param base64 Base64 string.
 * @returns Byte array.
 */
export declare function base64Decode(base64: string): Uint8Array;