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import { DEV } from 'esm-env';
import { init_array_prototype_warnings } from '../dev/equality.js';
import { current_effect } from '../runtime.js';
import { HYDRATION_ANCHOR } from '../../../constants.js';
// export these for reference in the compiled code, making global name deduplication unnecessary
/** @type {Window} */
export var $window;
/** @type {Document} */
export var $document;
/**
* Initialize these lazily to avoid issues when using the runtime in a server context
* where these globals are not available while avoiding a separate server entry point
*/
export function init_operations() {
if ($window !== undefined) {
return;
}
$window = window;
$document = document;
var element_prototype = Element.prototype;
// the following assignments improve perf of lookups on DOM nodes
// @ts-expect-error
element_prototype.__click = undefined;
// @ts-expect-error
element_prototype.__className = '';
// @ts-expect-error
element_prototype.__attributes = null;
// @ts-expect-error
element_prototype.__e = undefined;
// @ts-expect-error
Text.prototype.__t = 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`)
var first = /** @type {DocumentFragment} */ (fragment).firstChild;
// TODO prevent user comments with the empty string when preserveComments is true
if (first instanceof Comment && first.data === '') return first.nextSibling;
return first;
}
// if an {expression} is empty during SSR, there might be no
// text node to hydrate — we must therefore create one
if (is_text && hydrate_start?.nodeType !== 3) {
var text = empty();
var effect = /** @type {import('#client').Effect} */ (current_effect);
if (effect.nodes?.start === hydrate_start) {
effect.nodes.start = text;
}
hydrate_start?.before(text);
return text;
}
return hydrate_anchor(hydrate_start);
}
/**
* @template {Node} N
* @param {N} node
* @param {boolean} is_text
* @returns {Node | null}
*/
/*#__NO_SIDE_EFFECTS__*/
export function sibling(node, is_text = false) {
var next_sibling = /** @type {import('#client').TemplateNode} */ (node.nextSibling);
if (!hydrating) {
return next_sibling;
}
var type = next_sibling.nodeType;
if (type === 8 && /** @type {Comment} */ (next_sibling).data === HYDRATION_ANCHOR) {
return sibling(next_sibling, is_text);
}
// if a sibling {expression} is empty during SSR, there might be no
// text node to hydrate — we must therefore create one
if (is_text && type !== 3) {
var text = empty();
next_sibling?.before(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 = '';
}
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