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import { DEV } from 'esm-env';
import { init_array_prototype_warnings } from '../dev/equality.js';
// We cache the Node and Element prototype methods, so that we can avoid doing
// expensive prototype chain lookups.
/** @type {Node} */
var node_prototype;
/** @type {Element} */
var element_prototype;
/** @type {Text} */
var text_prototype;
// export these for reference in the compiled code, making global name deduplication unnecessary
/**
* @type {Window}
*/
export var $window;
/**
* @type {Document}
*/
export var $document;
/**
* Initialize these lazily to avoid issues when using the runtime in a server context
* where these globals are not available while avoiding a separate server entry point
*/
export function init_operations() {
if (node_prototype !== undefined) {
return;
}
node_prototype = Node.prototype;
element_prototype = Element.prototype;
text_prototype = Text.prototype;
$window = window;
$document = document;
// the following assignments improve perf of lookups on DOM nodes
// @ts-expect-error
element_prototype.__click = undefined;
// @ts-expect-error
text_prototype.__nodeValue = ' ';
// @ts-expect-error
element_prototype.__className = '';
// @ts-expect-error
element_prototype.__attributes = null;
// @ts-expect-error
element_prototype.__e = undefined;
if (DEV) {
// @ts-expect-error
element_prototype.__svelte_meta = null;
init_array_prototype_warnings();
}
}
/** @returns {Text} */
export function empty() {
return document.createTextNode('');
}
/**
* @template {Node} N
* @param {N} node
* @returns {Node | null}
*/
/*#__NO_SIDE_EFFECTS__*/
export function child(node) {
const child = node.firstChild;
if (!hydrating) return child;
// Child can be null if we have an element with a single child, like `<p>{text}</p>`, where `text` is empty
if (child === null) {
return node.appendChild(empty());
}
return hydrate_anchor(child);
}
/**
* @param {DocumentFragment | import('#client').TemplateNode[]} fragment
* @param {boolean} is_text
* @returns {Node | null}
*/
/*#__NO_SIDE_EFFECTS__*/
export function first_child(fragment, is_text) {
if (!hydrating) {
// when not hydrating, `fragment` is a `DocumentFragment` (the result of calling `open_frag`)
return /** @type {DocumentFragment} */ (fragment).firstChild;
}
// when we _are_ hydrating, `fragment` is an array of nodes
const first_node = /** @type {import('#client').TemplateNode[]} */ (fragment)[0];
// if an {expression} is empty during SSR, there might be no
// text node to hydrate — we must therefore create one
if (is_text && first_node?.nodeType !== 3) {
const text = empty();
hydrate_nodes.unshift(text);
first_node?.before(text);
return text;
}
return hydrate_anchor(first_node);
}
/**
* @template {Node} N
* @param {N} node
* @param {boolean} is_text
* @returns {Node | null}
*/
/*#__NO_SIDE_EFFECTS__*/
export function sibling(node, is_text = false) {
const next_sibling = node.nextSibling;
if (!hydrating) {
return next_sibling;
}
// if a sibling {expression} is empty during SSR, there might be no
// text node to hydrate — we must therefore create one
if (is_text && next_sibling?.nodeType !== 3) {
const text = empty();
if (next_sibling) {
const index = hydrate_nodes.indexOf(/** @type {Text | Comment | Element} */ (next_sibling));
hydrate_nodes.splice(index, 0, text);
next_sibling.before(text);
} else {
hydrate_nodes.push(text);
}
return text;
}
return hydrate_anchor(/** @type {Node} */ (next_sibling));
}
/**
* @template {Node} N
* @param {N} node
* @returns {void}
*/
export function clear_text_content(node) {
node.textContent = '';
}
/** @param {string} name */
/*#__NO_SIDE_EFFECTS__*/
export function create_element(name) {
return document.createElement(name);
}
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