src/constants.js

/**
 * Used to determine if a vnode should be recycled.
 * @type {number}
 */
export const RECYCLED_NODE = 0

/**
 * Used in a vnode to indicate that it is a DOM node.
 * @type {number}
 */
export const ELEMENT_NODE = 1

/**
 * Used in a vnode to indicate that it is a text node.
 * @type {number}
 */
export const TEXT_NODE = 3

/**
 * Namespace for SVG elements with `xlink:href` attributes.
 * @type {string}
 */
export const XLINK_NS = 'http://www.w3.org/1999/xlink'

/**
 * Namespace for SVG elements.
 * @type {string}
 */
export const SVG_NS = 'http://www.w3.org/2000/svg'

/**
 * An empty object. Used as placeholder for `props` in VNode.
 * @type {{}} EMPTY_OBJECT
 */
export const EMPTY_OBJECT = {}

/**
 * An empty array. Used for access to array methods.
 * @type {any[]} EMPTY_ARRAY
 */
export const EMPTY_ARRAY = []

/**
 * An array to store lifecycle hooks.
 * @type {any[]} LIFECYCLE
 */
export const LIFECYCLE = []