/**
* @license Copyright (c) 2003-2026, CKSource Holding sp. z o.o. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-licensing-options
*/
/**
* @module engine/view/element
*/
import { ViewNode } from "./node.js";
import { type ArrayOrItem } from "@ckeditor/ckeditor5-utils";
import { type MatcherPattern, type NormalizedPropertyPattern } from "./matcher.js";
import { type Styles, type StyleValue } from "./stylesmap.js";
import { type ViewDocument } from "./document.js";
import { type ViewItem } from "./item.js";
/**
* View element.
*
* The editing engine does not define a fixed semantics of its elements (it is "DTD-free").
* This is why the type of the {@link module:engine/view/element~ViewElement} need to
* be defined by the feature developer. When creating an element you should use one of the following methods:
*
* * {@link module:engine/view/downcastwriter~ViewDowncastWriter#createContainerElement `downcastWriter#createContainerElement()`}
* in order to create a {@link module:engine/view/containerelement~ViewContainerElement},
* * {@link module:engine/view/downcastwriter~ViewDowncastWriter#createAttributeElement `downcastWriter#createAttributeElement()`}
* in order to create a {@link module:engine/view/attributeelement~ViewAttributeElement},
* * {@link module:engine/view/downcastwriter~ViewDowncastWriter#createEmptyElement `downcastWriter#createEmptyElement()`}
* in order to create a {@link module:engine/view/emptyelement~ViewEmptyElement}.
* * {@link module:engine/view/downcastwriter~ViewDowncastWriter#createUIElement `downcastWriter#createUIElement()`}
* in order to create a {@link module:engine/view/uielement~ViewUIElement}.
* * {@link module:engine/view/downcastwriter~ViewDowncastWriter#createEditableElement `downcastWriter#createEditableElement()`}
* in order to create a {@link module:engine/view/editableelement~ViewEditableElement}.
*
* Note that for view elements which are not created from the model, like elements from mutations, paste or
* {@link module:engine/controller/datacontroller~DataController#set data.set} it is not possible to define the type of the element.
* In such cases the {@link module:engine/view/upcastwriter~ViewUpcastWriter#createElement `UpcastWriter#createElement()`} method
* should be used to create generic view elements.
*/
export declare class ViewElement extends ViewNode {
	/**
	* Name of the element.
	*/
	readonly name: string;
	/**
	* A list of attribute names that should be rendered in the editing pipeline even though filtering mechanisms
	* implemented in the {@link module:engine/view/domconverter~ViewDomConverter} (for instance,
	* {@link module:engine/view/domconverter~ViewDomConverter#shouldRenderAttribute}) would filter them out.
	*
	* These attributes can be specified as an option when the element is created by
	* the {@link module:engine/view/downcastwriter~ViewDowncastWriter}. To check whether an unsafe an attribute should
	* be permitted, use the {@link #shouldRenderUnsafeAttribute} method.
	*
	* @internal
	*/
	readonly _unsafeAttributesToRender: Array<string>;
	/**
	* Map of attributes, where attributes names are keys and attributes values are values.
	*/
	private readonly _attrs;
	/**
	* Array of child nodes.
	*/
	private readonly _children;
	/**
	* Map of custom properties.
	* Custom properties can be added to element instance, will be cloned but not rendered into DOM.
	*/
	private readonly _customProperties;
	/**
	* Set of classes associated with element instance.
	*
	* Note that this is just an alias for `this._attrs.get( 'class' );`
	*/
	private get _classes();
	/**
	* Normalized styles.
	*
	* Note that this is just an alias for `this._attrs.get( 'style' );`
	*/
	private get _styles();
	/**
	* Creates a view element.
	*
	* Attributes can be passed in various formats:
	*
	* ```ts
	* new Element( viewDocument, 'div', { class: 'editor', contentEditable: 'true' } ); // object
	* new Element( viewDocument, 'div', [ [ 'class', 'editor' ], [ 'contentEditable', 'true' ] ] ); // map-like iterator
	* new Element( viewDocument, 'div', mapOfAttributes ); // map
	* ```
	*
	* @internal
	* @param document The document instance to which this element belongs.
	* @param name Node name.
	* @param attrs Collection of attributes.
	* @param children A list of nodes to be inserted into created element.
	*/
	constructor(document: ViewDocument, name: string, attrs?: ViewElementAttributes, children?: ViewNode | Iterable<ViewNode>);
	/**
	* Number of element's children.
	*/
	get childCount(): number;
	/**
	* Is `true` if there are no nodes inside this element, `false` otherwise.
	*/
	get isEmpty(): boolean;
	/**
	* Gets child at the given index.
	*
	* @param index Index of child.
	* @returns Child node.
	*/
	getChild(index: number): ViewNode | undefined;
	/**
	* Gets index of the given child node. Returns `-1` if child node is not found.
	*
	* @param node Child node.
	* @returns Index of the child node.
	*/
	getChildIndex(node: ViewNode): number;
	/**
	* Gets child nodes iterator.
	*
	* @returns Child nodes iterator.
	*/
	getChildren(): IterableIterator<ViewNode>;
	/**
	* Returns an iterator that contains the keys for attributes. Order of inserting attributes is not preserved.
	*
	* @returns Keys for attributes.
	*/
	getAttributeKeys(): IterableIterator<string>;
	/**
	* Returns iterator that iterates over this element's attributes.
	*
	* Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.
	* This format is accepted by native `Map` object and also can be passed in `Node` constructor.
	*/
	getAttributes(): IterableIterator<[string, string]>;
	/**
	* Gets attribute by key. If attribute is not present - returns undefined.
	*
	* @param key Attribute key.
	* @returns Attribute value.
	*/
	getAttribute(key: string): string | undefined;
	/**
	* Returns a boolean indicating whether an attribute with the specified key exists in the element.
	*
	* @param key Attribute key.
	* @returns `true` if attribute with the specified key exists in the element, `false` otherwise.
	*/
	hasAttribute(key: string, token?: string): boolean;
	/**
	* Checks if this element is similar to other element.
	* Both elements should have the same name and attributes to be considered as similar. Two similar elements
	* can contain different set of children nodes.
	*/
	isSimilar(otherElement: ViewItem): boolean;
	/**
	* Returns true if class is present.
	* If more then one class is provided - returns true only when all classes are present.
	*
	* ```ts
	* element.hasClass( 'foo' ); // Returns true if 'foo' class is present.
	* element.hasClass( 'foo', 'bar' ); // Returns true if 'foo' and 'bar' classes are both present.
	* ```
	*/
	hasClass(...className: Array<string>): boolean;
	/**
	* Returns iterator that contains all class names.
	*/
	getClassNames(): IterableIterator<string>;
	/**
	* Returns style value for the given property name.
	* If the style does not exist `undefined` is returned.
	*
	* **Note**: This method can work with normalized style names if
	* {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.
	* See {@link module:engine/view/stylesmap~StylesMap#getAsString `StylesMap#getAsString()`} for details.
	*
	* For an element with style set to `'margin:1px'`:
	*
	* ```ts
	* // Enable 'margin' shorthand processing:
	* editor.data.addStyleProcessorRules( addMarginStylesRules );
	*
	* const element = view.change( writer => {
	* 	const element = writer.createElement();
	* 	writer.setStyle( 'margin', '1px' );
	* 	writer.setStyle( 'margin-bottom', '3em' );
	*
	* 	return element;
	* } );
	*
	* element.getStyle( 'margin' ); // -> 'margin: 1px 1px 3em;'
	* ```
	*/
	getStyle(property: string): string | undefined;
	/**
	* Returns a normalized style object or single style value.
	*
	* For an element with style set to: margin:1px 2px 3em;
	*
	* ```ts
	* element.getNormalizedStyle( 'margin' ) );
	* ```
	*
	* will return:
	*
	* ```ts
	* {
	* 	top: '1px',
	* 	right: '2px',
	* 	bottom: '3em',
	* 	left: '2px'    // a normalized value from margin shorthand
	* }
	* ```
	*
	* and reading for single style value:
	*
	* ```ts
	* styles.getNormalizedStyle( 'margin-left' );
	* ```
	*
	* Will return a `2px` string.
	*
	* **Note**: This method will return normalized values only if
	* {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.
	* See {@link module:engine/view/stylesmap~StylesMap#getNormalized `StylesMap#getNormalized()`} for details.
	*
	* @param property Name of CSS property
	*/
	getNormalizedStyle(property: string): StyleValue | undefined;
	/**
	* Returns an array that contains all style names.
	*
	* @param expand Expand shorthand style properties and return all equivalent style representations.
	*/
	getStyleNames(expand?: boolean): Array<string>;
	/**
	* Returns true if style keys are present.
	* If more then one style property is provided - returns true only when all properties are present.
	*
	* ```ts
	* element.hasStyle( 'color' ); // Returns true if 'border-top' style is present.
	* element.hasStyle( 'color', 'border-top' ); // Returns true if 'color' and 'border-top' styles are both present.
	* ```
	*/
	hasStyle(...property: Array<string>): boolean;
	/**
	* Returns ancestor element that match specified pattern.
	* Provided patterns should be compatible with {@link module:engine/view/matcher~Matcher Matcher} as it is used internally.
	*
	* @see module:engine/view/matcher~Matcher
	* @param patterns Patterns used to match correct ancestor. See {@link module:engine/view/matcher~Matcher}.
	* @returns Found element or `null` if no matching ancestor was found.
	*/
	findAncestor(...patterns: Array<MatcherPattern | ((element: ViewElement) => boolean)>): ViewElement | null;
	/**
	* Returns the custom property value for the given key.
	*/
	getCustomProperty(key: string | symbol): unknown;
	/**
	* Returns an iterator which iterates over this element's custom properties.
	* Iterator provides `[ key, value ]` pairs for each stored property.
	*/
	getCustomProperties(): IterableIterator<[string | symbol, unknown]>;
	/**
	* Returns identity string based on element's name, styles, classes and other attributes.
	* Two elements that {@link #isSimilar are similar} will have same identity string.
	* It has the following format:
	*
	* ```ts
	* 'name class="class1,class2" style="style1:value1;style2:value2" attr1="val1" attr2="val2"'
	* ```
	*
	* For example:
	*
	* ```ts
	* const element = writer.createContainerElement( 'foo', {
	* 	banana: '10',
	* 	apple: '20',
	* 	style: 'color: red; border-color: white;',
	* 	class: 'baz'
	* } );
	*
	* // returns 'foo class="baz" style="border-color:white;color:red" apple="20" banana="10"'
	* element.getIdentity();
	* ```
	*
	* **Note**: Classes, styles and other attributes are sorted alphabetically.
	*/
	getIdentity(): string;
	/**
	* Decides whether an unsafe attribute is whitelisted and should be rendered in the editing pipeline even though filtering mechanisms
	* like {@link module:engine/view/domconverter~ViewDomConverter#shouldRenderAttribute} say it should not.
	*
	* Unsafe attribute names can be specified when creating an element via {@link module:engine/view/downcastwriter~ViewDowncastWriter}.
	*
	* @param attributeName The name of the attribute to be checked.
	*/
	shouldRenderUnsafeAttribute(attributeName: string): boolean;
	/**
	* Converts `ViewElement` to plain object and returns it.
	*
	* @returns `ViewElement` converted to plain object.
	*/
	override toJSON(): unknown;
	/**
	* Clones provided element.
	*
	* @internal
	* @param deep If set to `true` clones element and all its children recursively. When set to `false`,
	* element will be cloned without any children.
	* @returns Clone of this element.
	*/
	_clone(deep?: boolean): this;
	/**
	* {@link module:engine/view/element~ViewElement#_insertChild Insert} a child node or a list of child nodes at the end of this node
	* and sets the parent of these nodes to this element.
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#insert
	* @internal
	* @param items Items to be inserted.
	* @fires change
	* @returns Number of appended nodes.
	*/
	_appendChild(items: ViewItem | string | Iterable<ViewItem | string>): number;
	/**
	* Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to
	* this element.
	*
	* @internal
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#insert
	* @param index Position where nodes should be inserted.
	* @param items Items to be inserted.
	* @fires change
	* @returns Number of inserted nodes.
	*/
	_insertChild(index: number, items: ViewItem | string | Iterable<ViewItem | string>): number;
	/**
	* Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#remove
	* @internal
	* @param index Number of the first node to remove.
	* @param howMany Number of nodes to remove.
	* @fires change
	* @returns The array of removed nodes.
	*/
	_removeChildren(index: number, howMany?: number): Array<ViewNode>;
	/**
	* Adds or overwrite attribute with a specified key and value.
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#setAttribute
	* @internal
	* @param key Attribute key.
	* @param value Attribute value.
	* @param overwrite Whether tokenized attribute should override the attribute value or just add a token.
	* @fires change
	*/
	_setAttribute(key: string, value: unknown, overwrite?: boolean): void;
	/**
	* Removes attribute from the element.
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#removeAttribute
	* @internal
	* @param key Attribute key.
	* @param tokens Attribute value tokens to remove. The whole attribute is removed if not specified.
	* @returns Returns true if an attribute existed and has been removed.
	* @fires change
	*/
	_removeAttribute(key: string, tokens?: ArrayOrItem<string>): boolean;
	/**
	* Adds specified class.
	*
	* ```ts
	* element._addClass( 'foo' ); // Adds 'foo' class.
	* element._addClass( [ 'foo', 'bar' ] ); // Adds 'foo' and 'bar' classes.
	* ```
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#addClass
	* @internal
	* @fires change
	*/
	_addClass(className: ArrayOrItem<string>): void;
	/**
	* Removes specified class.
	*
	* ```ts
	* element._removeClass( 'foo' );  // Removes 'foo' class.
	* element._removeClass( [ 'foo', 'bar' ] ); // Removes both 'foo' and 'bar' classes.
	* ```
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#removeClass
	* @internal
	* @fires change
	*/
	_removeClass(className: ArrayOrItem<string>): void;
	/**
	* Adds style to the element.
	*
	* ```ts
	* element._setStyle( 'color', 'red' );
	* ```
	*
	* **Note**: This method can work with normalized style names if
	* {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.
	* See {@link module:engine/view/stylesmap~StylesMap#set `StylesMap#set()`} for details.
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#setStyle
	* @label KEY_VALUE
	* @internal
	* @param property Property name.
	* @param value Value to set.
	* @fires change
	*/
	_setStyle(property: string, value: StyleValue): void;
	/**
	* Adds style to the element.
	*
	* ```ts
	* element._setStyle( {
	* 	color: 'red',
	* 	position: 'fixed'
	* } );
	* ```
	*
	* **Note**: This method can work with normalized style names if
	* {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.
	* See {@link module:engine/view/stylesmap~StylesMap#set `StylesMap#set()`} for details.
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#setStyle
	* @label OBJECT
	* @internal
	* @param properties Object with key - value pairs.
	* @fires change
	*/
	_setStyle(properties: Record<string, StyleValue>): void;
	/**
	* Removes specified style.
	*
	* ```ts
	* element._removeStyle( 'color' );  // Removes 'color' style.
	* element._removeStyle( [ 'color', 'border-top' ] ); // Removes both 'color' and 'border-top' styles.
	* ```
	*
	* **Note**: This method can work with normalized style names if
	* {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.
	* See {@link module:engine/view/stylesmap~StylesMap#remove `StylesMap#remove()`} for details.
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#removeStyle
	* @internal
	* @fires change
	*/
	_removeStyle(property: ArrayOrItem<string>): void;
	/**
	* Used by the {@link module:engine/view/matcher~Matcher Matcher} to collect matching attribute tuples
	* (attribute name and optional token).
	*
	* Normalized patterns can be used in following ways:
	* - to match any attribute name with any or no value:
	*
	* ```ts
	* patterns: [
	* 	[ true, true ]
	* ]
	* ```
	*
	* - to match a specific attribute with any value:
	*
	* ```ts
	* patterns: [
	* 	[ 'required', true ]
	* ]
	* ```
	*
	* - to match an attribute name with a RegExp with any value:
	*
	* ```ts
	* patterns: [
	* 	[ /h[1-6]/, true ]
	* ]
	* ```
	*
	* 	- to match a specific attribute with the exact value:
	*
	* ```ts
	* patterns: [
	* 	[ 'rel', 'nofollow' ]
	* ]
	* ```
	*
	* 	- to match a specific attribute with a value matching a RegExp:
	*
	* ```ts
	* patterns: [
	* 	[ 'src', /^https/ ]
	* ]
	* ```
	*
	* 	- to match an attribute name with a RegExp and the exact value:
	*
	* ```ts
	* patterns: [
	* 	[ /^data-property-/, 'foobar' ],
	* ]
	* ```
	*
	* 	- to match an attribute name with a RegExp and match a value with another RegExp:
	*
	* ```ts
	* patterns: [
	* 	[ /^data-property-/, /^foo/ ]
	* ]
	* ```
	*
	* 	- to match a specific style property with the value matching a RegExp:
	*
	* ```ts
	* patterns: [
	* 	[ 'style', 'font-size', /px$/ ]
	* ]
	* ```
	*
	* 	- to match a specific class (class attribute is tokenized so it matches tokens individually):
	*
	* ```ts
	* patterns: [
	* 	[ 'class', 'foo' ]
	* ]
	* ```
	*
	* @internal
	* @param patterns An array of normalized patterns (tuples of 2 or 3 items depending on if tokenized attribute value match is needed).
	* @param match An array to populate with matching tuples.
	* @param exclude Array of attribute names to exclude from match.
	* @returns `true` if element matches all patterns. The matching tuples are pushed to the `match` array.
	*/
	_collectAttributesMatch(patterns: Array<NormalizedPropertyPattern>, match: Array<[string, string?]>, exclude?: Array<string>): boolean;
	/**
	* Used by the {@link module:engine/conversion/viewconsumable~ViewConsumable} to collect the
	* {@link module:engine/view/element~ViewNormalizedConsumables} for the element.
	*
	* When `key` and `token` parameters are provided the output is filtered for the specified attribute and it's tokens and related tokens.
	*
	* @internal
	* @param key Attribute name.
	* @param token Reference token to collect all related tokens.
	*/
	_getConsumables(key?: string, token?: string): ViewNormalizedConsumables;
	/**
	* Verify if the given element can be merged without conflicts into the element.
	*
	* Note that this method is extended by the {@link module:engine/view/attributeelement~ViewAttributeElement} implementation.
	*
	* This method is used by the {@link module:engine/view/downcastwriter~ViewDowncastWriter} while down-casting
	* an {@link module:engine/view/attributeelement~ViewAttributeElement} to merge it with other ViewAttributeElement.
	*
	* @internal
	* @returns Returns `true` if elements can be merged.
	*/
	_canMergeAttributesFrom(otherElement: ViewElement): boolean;
	/**
	* Merges attributes of a given element into the element.
	* This includes also tokenized attributes like style and class.
	*
	* Note that you should make sure there are no conflicts before merging (see {@link #_canMergeAttributesFrom}).
	*
	* This method is used by the {@link module:engine/view/downcastwriter~ViewDowncastWriter} while down-casting
	* an {@link module:engine/view/attributeelement~ViewAttributeElement} to merge it with other ViewAttributeElement.
	*
	* @internal
	*/
	_mergeAttributesFrom(otherElement: ViewElement): void;
	/**
	* Verify if the given element attributes can be fully subtracted from the element.
	*
	* Note that this method is extended by the {@link module:engine/view/attributeelement~ViewAttributeElement} implementation.
	*
	* This method is used by the {@link module:engine/view/downcastwriter~ViewDowncastWriter} while down-casting
	* an {@link module:engine/view/attributeelement~ViewAttributeElement} to unwrap the ViewAttributeElement.
	*
	* @internal
	* @returns Returns `true` if elements attributes can be fully subtracted.
	*/
	_canSubtractAttributesOf(otherElement: ViewElement): boolean;
	/**
	* Removes (subtracts) corresponding attributes of the given element from the element.
	* This includes also tokenized attributes like style and class.
	* All attributes, classes and styles from given element should be present inside the element being unwrapped.
	*
	* Note that you should make sure all attributes could be subtracted before subtracting them (see {@link #_canSubtractAttributesOf}).
	*
	* This method is used by the {@link module:engine/view/downcastwriter~ViewDowncastWriter} while down-casting
	* an {@link module:engine/view/attributeelement~ViewAttributeElement} to unwrap the ViewAttributeElement.
	*
	* @internal
	*/
	_subtractAttributesOf(otherElement: ViewElement): void;
	/**
	* Sets a custom property. Unlike attributes, custom properties are not rendered to the DOM,
	* so they can be used to add special data to elements.
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#setCustomProperty
	* @internal
	*/
	_setCustomProperty(key: string | symbol, value: unknown): void;
	/**
	* Removes the custom property stored under the given key.
	*
	* @see module:engine/view/downcastwriter~ViewDowncastWriter#removeCustomProperty
	* @internal
	* @returns Returns true if property was removed.
	*/
	_removeCustomProperty(key: string | symbol): boolean;
	/**
	* Parses attributes provided to the element constructor before they are applied to an element. If attributes are passed
	* as an object (instead of `Iterable`), the object is transformed to the map. Attributes with `null` value are removed.
	* Attributes with non-`String` value are converted to `String`.
	*
	* @param attrs Attributes to parse.
	* @returns Parsed attributes.
	*/
	private _parseAttributes;
	/**
	* Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.
	*/
	getFillerOffset?(): number | null;
}
/**
* Common interface for a {@link module:engine/view/tokenlist~ViewTokenList} and {@link module:engine/view/stylesmap~StylesMap}.
*/
export interface ViewElementAttributeValue {
	/**
	* Returns `true` if attribute has no value set.
	*/
	get isEmpty(): boolean;
	/**
	* Number of tokens (styles, classes or other tokens) defined.
	*/
	get size(): number;
	/**
	* Checks if a given token (style, class, token) is set.
	*/
	has(name: string): boolean;
	/**
	* Returns all tokens (styles, classes, other tokens).
	*/
	keys(): Array<string>;
	/**
	* Resets the value to the given one.
	*/
	setTo(value: string): this;
	/**
	* Sets a given style property and value.
	*/
	set(name: string, value: StyleValue): void;
	/**
	* Sets a given token (for style also a record of properties).
	*/
	set(stylesOrTokens: Styles | ArrayOrItem<string>): void;
	/**
	* Removes given token (style, class, other token).
	*/
	remove(tokens: ArrayOrItem<string>): void;
	/**
	* Removes all tokens.
	*/
	clear(): void;
	/**
	* Returns a normalized tokens string (styles, classes, etc.).
	*/
	toString(): string;
	/**
	* Returns `true` if both attributes have the same content.
	*/
	isSimilar(other: this): boolean;
	/**
	* Clones the attribute value.
	*/
	_clone(): this;
	/**
	* Used by the {@link module:engine/view/matcher~Matcher Matcher} to collect matching attribute tokens.
	*
	* @param tokenPattern The matched token name pattern.
	* @param valuePattern The matched token value pattern.
	* @returns An array of matching tokens.
	*/
	_getTokensMatch(tokenPattern: true | string | RegExp, valuePattern?: true | string | RegExp): Array<string> | undefined;
	/**
	* Returns a list of consumables for the attribute. This includes related tokens
	* (for example other forms of notation of the same style property).
	*
	* Could be filtered by the given token name (class name, style property, etc.).
	*/
	_getConsumables(name?: string): Array<string>;
	/**
	* Used by {@link ~ViewElement#_canMergeAttributesFrom} to verify if the given attribute can be merged without
	* conflicts into the attribute.
	*
	* This method is indirectly used by the {@link module:engine/view/downcastwriter~ViewDowncastWriter} while down-casting
	* an {@link module:engine/view/attributeelement~ViewAttributeElement} to merge it with other ViewAttributeElement.
	*/
	_canMergeFrom(other: this): boolean;
	/**
	* Used by {@link ~ViewElement#_mergeAttributesFrom} to merge a given attribute into the attribute.
	*
	* This method is indirectly used by the {@link module:engine/view/downcastwriter~ViewDowncastWriter} while down-casting
	* an {@link module:engine/view/attributeelement~ViewAttributeElement} to merge it with other ViewAttributeElement.
	*/
	_mergeFrom(other: this): void;
	/**
	* Used by {@link ~ViewElement#_canSubtractAttributesOf} to verify if the given attribute can be fully subtracted from the attribute.
	*
	* This method is indirectly used by the {@link module:engine/view/downcastwriter~ViewDowncastWriter} while down-casting
	* an {@link module:engine/view/attributeelement~ViewAttributeElement} to unwrap the ViewAttributeElement.
	*/
	_isMatching(other: this): boolean;
}
/**
* Collection of attributes.
*/
export type ViewElementAttributes = Record<string, unknown> | Iterable<[string, unknown]> | null;
/**
* Object describing all features of a view element that could be consumed and converted individually.
* This is a normalized form of {@link module:engine/conversion/viewconsumable~Consumables} generated from the view Element.
*
* Example element:
*
* ```html
* <a class="foo bar" style="color: red; margin: 5px" href="https://ckeditor.com" rel="nofollow noreferrer" target="_blank">
* ```
*
* The `ViewNormalizedConsumables` would include:
*
* ```json
* {
* 	name: true,
* 	attributes: [
* 		[ "class", "foo" ],
* 		[ "class", "bar" ],
* 		[ "style", "color" ],
* 		[ "style", "margin-top" ],
* 		[ "style", "margin-right" ],
* 		[ "style", "margin-bottom" ],
* 		[ "style", "margin-left" ],
[ "style", "margin" ],
* 		[ "href" ],
* 		[ "rel", "nofollow" ],
* 		[ "rel", "noreferrer" ],
* 		[ "target" ]
* 	]
* }
* ```
*/
export interface ViewNormalizedConsumables {
	/**
	* If set to `true` element's name will be included in a consumable.
	* Depending on the usage context it would be added as consumable, tested for being available for consume or consumed.
	*/
	name: boolean;
	/**
	* Array of tuples - an attribute name, and optional token for tokenized attributes.
	* Note that there could be multiple entries for the same attribute with different tokens (class names or style properties).
	*/
	attributes: Array<[string, string?]>;
}