export declare type _XmlWriteState = 'Initial' | 'StartDocument' | 'EndDocument' | 'StartElement' | 'EndElement' | 'ElementContent';
export declare type _NamespaceKind = 'Written' | 'NeedToWrite' | 'Implied' | 'Special';
/**
 * Provides XML writing functionality for generating well formed XML documents with support for
 * namespaces, elements, attributes, and text content.
 *
 * @private
 */
export declare class _XmlWriter {
    /**
     * Internal text buffer that accumulates XML before flushing to bytes.
     *
     * @private
     * @type {string}
     */
    _bufferText: string;
    /**
     * Internal byte buffer containing the serialized XML document.
     *
     * @private
     * @type {Uint8Array}
     */
    _buffer: Uint8Array;
    /**
     * Current writer state used to validate write operations.
     *
     * @private
     * @type {_XmlWriteState}
     */
    _currentState: _XmlWriteState;
    /**
     * Stack of namespace records used while writing elements and attributes.
     *
     * @private
     * @type {_Namespace[]}
     */
    _namespaceStack: _Namespace[];
    /**
     * Stack of open XML elements.
     *
     * @private
     * @type {_XmlElement[]}
     */
    _elementStack: _XmlElement[];
    /**
     * Position marker used for compact empty element detection.
     *
     * @private
     * @type {number}
     */
    _position: number;
    /**
     * Currently collected attributes for the active element.
     *
     * @private
     * @type {_XmlAttribute[]}
     */
    _attributeStack: _XmlAttribute[];
    /**
     * Flag to skip writing namespace declarations (appearance mode).
     *
     * @private
     * @type {boolean}
     */
    _skipNamespace: boolean;
    /**
     * Gets the serialized XML buffer containing all written content.
     *
     * @private
     * @returns {Uint8Array} The complete XML document as a byte array.
     */
    readonly buffer: Uint8Array;
    /**
     * Initializes a new instance of the _XmlWriter class with optional appearance mode.
     *
     * @private
     * @param {boolean} [isAppearance=false] Whether to initialize in appearance mode, skipping namespace handling.
     * @returns {void}
     */
    constructor(isAppearance?: boolean);
    /**
     * Writes the XML document declaration to the output buffer.
     *
     * @private
     * @param {boolean} [standalone] Optional flag indicating if the document is standalone.
     * @returns {void}
     * @throws {Error} Throws an error if called in an invalid state or if the buffer is undefined.
     */
    _writeStartDocument(standalone?: boolean): void;
    /**
     * Writes the start tag of an XML element with optional prefix and namespace.
     *
     * @private
     * @param {string} localName The local name of the element to write.
     * @param {string} [prefix] Optional namespace prefix for the element.
     * @param {string} [namespace] Optional namespace URI for the element.
     * @returns {void}
     * @throws {Error} Throws an error if localName is invalid, undefined, null, or empty.
     */
    _writeStartElement(localName: string, prefix?: string, namespace?: string): void;
    /**
     * Writes the end tag of the current XML element and closes it.
     *
     * @private
     * @returns {void}
     */
    _writeEndElement(): void;
    /**
     * Writes an XML element with text content in a single operation.
     *
     * @private
     * @param {string} localName The local name of the element.
     * @param {string} value The text content of the element.
     * @param {string} [prefix] Optional namespace prefix for the element.
     * @param {string} [namespace] Optional namespace URI for the element.
     * @returns {void}
     */
    _writeElementString(localName: string, value: string, prefix?: string, namespace?: string): void;
    /**
     * Writes an XML attribute with the specified name and value.
     *
     * @private
     * @param {string} localName The local name of the attribute.
     * @param {string} value The value of the attribute.
     * @param {string} [prefix] Optional namespace prefix for the attribute.
     * @param {string} [namespace] Optional namespace URI for the attribute.
     * @returns {void}
     */
    _writeAttributeString(localName: string, value: string, prefix?: string, namespace?: string): void;
    /**
     * Writes text content to the current XML element.
     *
     * @private
     * @param {string} text The text content to write.
     * @returns {void}
     */
    _writeString(text: string): void;
    /**
     * Writes raw XML text without escaping special characters.
     *
     * @private
     * @param {string} text The raw XML text to write.
     * @returns {void}
     */
    _writeRaw(text: string): void;
    /**
     * Writes text to the current XML element with optional raw string mode.
     *
     * @private
     * @param {string} text The text to write.
     * @param {boolean} isRawString Whether to write as raw text without escaping special characters.
     * @returns {void}
     * @throws {Error} Throws an error if called in an invalid state.
     */
    _writeInternal(text: string, isRawString: boolean): void;
    /**
     * Saves the XML document and returns the complete serialized byte array.
     *
     * @private
     * @returns {Uint8Array} The complete XML document as a byte array.
     */
    _save(): Uint8Array;
    /**
     * Destroys the XML writer and cleans up all internal resources.
     *
     * @private
     * @returns {void}
     */
    _destroy(): void;
    /**
     * Flushes the internal text buffer to the byte array buffer.
     *
     * @private
     * @returns {void}
     */
    _flush(): void;
    /**
     * Writes the start of an XML attribute with validation.
     *
     * @private
     * @param {string} localName The local name of the attribute.
     * @param {string} value The value of the attribute.
     * @param {string} prefix The namespace prefix for the attribute.
     * @param {string} namespace The namespace URI for the attribute.
     * @returns {void}
     * @throws {Error} Throws an error if the localName is invalid or if not in the correct state.
     */
    _writeStartAttribute(localName: string, value: string, prefix: string, namespace: string): void;
    /**
     * Writes the start of an XML attribute with prefix and namespace resolution.
     *
     * @private
     * @param {string} localName The local name of the attribute.
     * @param {string} value The value of the attribute.
     * @param {string} [prefix] Optional namespace prefix for the attribute.
     * @param {string} [namespace] Optional namespace URI for the attribute.
     * @returns {void}
     */
    _writeStartAttributePrefixAndNameSpace(localName: string, value: string, prefix?: string, namespace?: string): void;
    /**
     * Writes the start of an XML attribute with special attribute handling.
     *
     * @private
     * @param {string} prefix The namespace prefix for the attribute.
     * @param {string} localName The local name of the attribute.
     * @param {string} namespace The namespace URI for the attribute.
     * @param {string} value The value of the attribute.
     * @returns {void}
     * @throws {Error} Throws an error for invalid namespace declarations or special attributes.
     */
    _writeStartAttributeSpecialAttribute(prefix: string, localName: string, namespace: string, value: string): void;
    /**
     * Writes the end of an XML attribute.
     *
     * @private
     * @returns {void}
     */
    _writeEndAttribute(): void;
    /**
     * Internally writes the start tag of an XML element and manages namespace stack.
     *
     * @private
     * @param {string} prefix The namespace prefix for the element.
     * @param {string} localName The local name of the element.
     * @param {string} namespace The namespace URI for the element.
     * @returns {void}
     */
    _writeStartElementInternal(prefix: string, localName: string, namespace: string): void;
    /**
     * Internally writes the end tag of an XML element.
     *
     * @private
     * @param {string} prefix The namespace prefix of the element being closed.
     * @param {string} localName The local name of the element being closed.
     * @returns {void}
     */
    _writeEndElementInternal(prefix: string, localName: string): void;
    /**
     * Internally writes the start of an XML attribute.
     *
     * @private
     * @param {string} prefix The namespace prefix for the attribute.
     * @param {string} localName The local name of the attribute.
     * @returns {void}
     */
    _writeStartAttributeInternal(prefix: string, localName: string): void;
    /**
     * Writes an XML namespace declaration.
     *
     * @private
     * @param {string} prefix The namespace prefix to declare.
     * @param {string} namespaceUri The namespace URI for the declaration.
     * @returns {void}
     */
    _writeNamespaceDeclaration(prefix: string, namespaceUri: string): void;
    /**
     * Writes the start of an XML namespace declaration.
     *
     * @private
     * @param {string} prefix The namespace prefix to declare.
     * @returns {void}
     */
    _writeStartNamespaceDeclaration(prefix: string): void;
    /**
     * Internally writes text with proper XML character escaping.
     *
     * @private
     * @param {string} text The text to write.
     * @param {boolean} inAttributeValue Whether the text is being written as an attribute value.
     * @returns {void}
     */
    _writeStringInternal(text: string, inAttributeValue: boolean): void;
    /**
     * Internally handles the start of element content and writes pending namespace declarations.
     *
     * @private
     * @returns {void}
     */
    _startElementContent(): void;
    /**
     * Writes raw text directly to the buffer without any processing.
     *
     * @private
     * @param {string} text The raw text to write.
     * @returns {void}
     */
    _rawText(text: string): void;
    /**
     * Adds a namespace entry to the internal namespace stack.
     *
     * @private
     * @param {string} prefix The namespace prefix.
     * @param {string} ns The namespace URI.
     * @param {_NamespaceKind} kind The classification of the namespace entry.
     * @returns {void}
     */
    _addNamespace(prefix: string, ns: string, kind: _NamespaceKind): void;
    /**
     * Looks up the prefix associated with a namespace URI.
     *
     * @private
     * @param {string} namespace The namespace URI to find a prefix for.
     * @returns {string} The prefix if found, otherwise undefined.
     */
    _lookupPrefix(namespace: string): string;
    /**
     * Looks up the namespace URI associated with a prefix.
     *
     * @private
     * @param {string} prefix The prefix to look up.
     * @returns {string} The namespace URI if found, otherwise undefined.
     */
    _lookupNamespace(prefix: string): string;
    /**
     * Looks up the index of a namespace entry in the namespace stack.
     *
     * @private
     * @param {string} prefix The namespace prefix to find.
     * @returns {number} The index of the namespace in the stack or -1 when not found.
     */
    _lookupNamespaceIndex(prefix: string): number;
    /**
     * Pushes an implicit namespace declaration to the stack, validating conflicts.
     *
     * @private
     * @param {string} prefix The namespace prefix.
     * @param {string} ns The namespace URI.
     * @returns {void}
     * @throws {Error} When invalid namespace configurations are detected.
     */
    _pushNamespaceImplicit(prefix: string, ns: string): void;
    /**
     * Pushes an explicit namespace declaration to the stack.
     *
     * @private
     * @param {string} prefix The namespace prefix.
     * @param {string} ns The namespace URI.
     * @returns {void}
     */
    _pushNamespaceExplicit(prefix: string, ns: string): void;
    /**
     * Adds an attribute record to the current attribute stack and checks for duplicates.
     *
     * @private
     * @param {string} prefix The attribute namespace prefix.
     * @param {string} localName The attribute local name.
     * @param {string} namespaceName The attribute namespace URI.
     * @returns {void}
     * @throws {Error} When a duplicate attribute name is detected.
     */
    _addAttribute(prefix: string, localName: string, namespaceName: string): void;
    /**
     * Adds attribute metadata and writes its start without pushing a namespace entry.
     *
     * @private
     * @param {string} prefix The attribute prefix.
     * @param {string} localName The attribute local name.
     * @param {string} namespace The attribute namespace URI.
     * @returns {void}
     */
    _skipPushAndWrite(prefix: string, localName: string, namespace: string): void;
    /**
     * Validates an XML name for invalid characters and throws on failure.
     *
     * @private
     * @param {string} text The name to validate.
     * @returns {void}
     * @throws {Error} When the name contains invalid characters.
     */
    _checkName(text: string): void;
}
/**
 * Represents an internal namespace entry used by the XML writer.
 *
 * @private
 */
export declare class _Namespace {
    /**
     * Namespace prefix.
     *
     * @private
     * @type {string}
     */
    _prefix: string;
    /**
     * Namespace URI.
     *
     * @private
     * @type {string}
     */
    _namespaceUri: string;
    /**
     * Classification of the namespace entry.
     *
     * @private
     * @type {_NamespaceKind}
     */
    _kind: _NamespaceKind;
    /**
     * Sets namespace properties.
     *
     * @private
     * @param {string} prefix The namespace prefix.
     * @param {string} namespaceUri The namespace URI.
     * @param {_NamespaceKind} kind The namespace kind.
     * @returns {void}
     */
    _set(prefix: string, namespaceUri: string, kind: _NamespaceKind): void;
    /**
     * Destroys the namespace entry and clears references.
     *
     * @private
     * @returns {void}
     */
    _destroy(): void;
}
/**
 * Represents an internal XML element frame used while writing nested elements.
 *
 * @private
 */
export declare class _XmlElement {
    /**
     * Previous top index of the namespace stack at the time the element was opened.
     *
     * @private
     * @type {number}
     */
    _previousTop: number;
    /**
     * The element's namespace prefix.
     *
     * @private
     * @type {string}
     */
    _prefix: string;
    /**
     * The element's local name.
     *
     * @private
     * @type {string}
     */
    _localName: string;
    /**
     * The element's namespace URI.
     *
     * @private
     * @type {string}
     */
    _namespaceUri: string;
    /**
     * Sets properties for the element frame.
     *
     * @private
     * @param {string} prefix Element prefix.
     * @param {string} localName Element local name.
     * @param {string} namespaceUri Element namespace URI.
     * @param {number} previousTop Previous namespace stack top index.
     * @returns {void}
     */
    _set(prefix: string, localName: string, namespaceUri: string, previousTop: number): void;
    /**
     * Destroys the element frame and clears references.
     *
     * @private
     * @returns {void}
     */
    _destroy(): void;
}
/**
 * Represents an internal XML attribute record.
 *
 * @private
 */
export declare class _XmlAttribute {
    /**
     * The attribute namespace prefix.
     *
     * @private
     * @type {string}
     */
    _prefix: string;
    /**
     * The attribute namespace URI.
     *
     * @private
     * @type {string}
     */
    _namespaceUri: string;
    /**
     * The attribute local name.
     *
     * @private
     * @type {string}
     */
    _localName: string;
    /**
     * Sets attribute properties.
     *
     * @private
     * @param {string} prefix The attribute prefix.
     * @param {string} localName The attribute local name.
     * @param {string} namespaceUri The attribute namespace URI.
     * @returns {void}
     */
    _set(prefix: string, localName: string, namespaceUri: string): void;
    /**
     * Checks whether this attribute would be a duplicate of another attribute.
     *
     * @private
     * @param {string} prefix Prefix to compare.
     * @param {string} localName Local name to compare.
     * @param {string} namespaceUri Namespace URI to compare.
     * @returns {boolean} True if duplicate; otherwise false.
     */
    _isDuplicate(prefix: string, localName: string, namespaceUri: string): boolean;
    /**
     * Destroys the attribute record and clears references.
     *
     * @private
     * @returns {void}
     */
    _destroy(): void;
}