Init

node_modules/preact/compat/src/portals.js

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+import { createElement, render } from 'preact';
+
+/**
+ * @param {import('../../src/index').RenderableProps<{ context: any }>} props
+ */
+function ContextProvider(props) {
+	this.getChildContext = () => props.context;
+	return props.children;
+}
+
+/**
+ * Portal component
+ * @this {import('./internal').Component}
+ * @param {object | null | undefined} props
+ *
+ * TODO: use createRoot() instead of fake root
+ */
+function Portal(props) {
+	const _this = this;
+	let container = props._container;
+
+	_this.componentWillUnmount = function () {
+		render(null, _this._temp);
+		_this._temp = null;
+		_this._container = null;
+	};
+
+	// When we change container we should clear our old container and
+	// indicate a new mount.
+	if (_this._container && _this._container !== container) {
+		_this.componentWillUnmount();
+	}
+
+	if (!_this._temp) {
+		// Ensure the element has a mask for useId invocations
+		let root = _this._vnode;
+		while (root !== null && !root._mask && root._parent !== null) {
+			root = root._parent;
+		}
+
+		_this._container = container;
+
+		// Create a fake DOM parent node that manages a subset of `container`'s children:
+		_this._temp = {
+			nodeType: 1,
+			parentNode: container,
+			childNodes: [],
+			_children: { _mask: root._mask },
+			contains: () => true,
+			insertBefore(child, before) {
+				this.childNodes.push(child);
+				_this._container.insertBefore(child, before);
+			},
+			removeChild(child) {
+				this.childNodes.splice(this.childNodes.indexOf(child) >>> 1, 1);
+				_this._container.removeChild(child);
+			}
+		};
+	}
+
+	// Render our wrapping element into temp.
+	render(
+		createElement(ContextProvider, { context: _this.context }, props._vnode),
+		_this._temp
+	);
+}
+
+/**
+ * Create a `Portal` to continue rendering the vnode tree at a different DOM node
+ * @param {import('./internal').VNode} vnode The vnode to render
+ * @param {import('./internal').PreactElement} container The DOM node to continue rendering in to.
+ */
+export function createPortal(vnode, container) {
+	const el = createElement(Portal, { _vnode: vnode, _container: container });
+	el.containerInfo = container;
+	return el;
+}