📝 Commit Details:

backend/node_modules/preact/src/cjs.js

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+import * as preact from './index.js';
+if (typeof module < 'u') module.exports = preact;
+else self.preact = preact;

backend/node_modules/preact/src/clone-element.js

@@ -0,0 +1,34 @@
+import { assign, slice } from './util';
+import { createVNode } from './create-element';
+
+/**
+ * Clones the given VNode, optionally adding attributes/props and replacing its children.
+ * @param {import('./internal').VNode} vnode The virtual DOM element to clone
+ * @param {object} props Attributes/props to add when cloning
+ * @param {Array<import('./internal').ComponentChildren>} rest Any additional arguments will be used as replacement children.
+ * @returns {import('./internal').VNode}
+ */
+export function cloneElement(vnode, props, children) {
+	let normalizedProps = assign({}, vnode.props),
+		key,
+		ref,
+		i;
+	for (i in props) {
+		if (i == 'key') key = props[i];
+		else if (i == 'ref') ref = props[i];
+		else normalizedProps[i] = props[i];
+	}
+
+	if (arguments.length > 2) {
+		normalizedProps.children =
+			arguments.length > 3 ? slice.call(arguments, 2) : children;
+	}
+
+	return createVNode(
+		vnode.type,
+		normalizedProps,
+		key || vnode.key,
+		ref || vnode.ref,
+		null
+	);
+}

backend/node_modules/preact/src/component.js

@@ -0,0 +1,237 @@
+import { assign } from './util';
+import { diff, commitRoot } from './diff/index';
+import options from './options';
+import { Fragment } from './create-element';
+import { inEvent } from './diff/props';
+
+/**
+ * Base Component class. Provides `setState()` and `forceUpdate()`, which
+ * trigger rendering
+ * @param {object} props The initial component props
+ * @param {object} context The initial context from parent components'
+ * getChildContext
+ */
+export function Component(props, context) {
+	this.props = props;
+	this.context = context;
+}
+
+/**
+ * Update component state and schedule a re-render.
+ * @this {import('./internal').Component}
+ * @param {object | ((s: object, p: object) => object)} update A hash of state
+ * properties to update with new values or a function that given the current
+ * state and props returns a new partial state
+ * @param {() => void} [callback] A function to be called once component state is
+ * updated
+ */
+Component.prototype.setState = function(update, callback) {
+	// only clone state when copying to nextState the first time.
+	let s;
+	if (this._nextState != null && this._nextState !== this.state) {
+		s = this._nextState;
+	} else {
+		s = this._nextState = assign({}, this.state);
+	}
+
+	if (typeof update == 'function') {
+		// Some libraries like `immer` mark the current state as readonly,
+		// preventing us from mutating it, so we need to clone it. See #2716
+		update = update(assign({}, s), this.props);
+	}
+
+	if (update) {
+		assign(s, update);
+	}
+
+	// Skip update if updater function returned null
+	if (update == null) return;
+
+	if (this._vnode) {
+		if (callback) {
+			this._stateCallbacks.push(callback);
+		}
+		enqueueRender(this);
+	}
+};
+
+/**
+ * Immediately perform a synchronous re-render of the component
+ * @this {import('./internal').Component}
+ * @param {() => void} [callback] A function to be called after component is
+ * re-rendered
+ */
+Component.prototype.forceUpdate = function(callback) {
+	if (this._vnode) {
+		// Set render mode so that we can differentiate where the render request
+		// is coming from. We need this because forceUpdate should never call
+		// shouldComponentUpdate
+		this._force = true;
+		if (callback) this._renderCallbacks.push(callback);
+		enqueueRender(this);
+	}
+};
+
+/**
+ * Accepts `props` and `state`, and returns a new Virtual DOM tree to build.
+ * Virtual DOM is generally constructed via [JSX](http://jasonformat.com/wtf-is-jsx).
+ * @param {object} props Props (eg: JSX attributes) received from parent
+ * element/component
+ * @param {object} state The component's current state
+ * @param {object} context Context object, as returned by the nearest
+ * ancestor's `getChildContext()`
+ * @returns {import('./index').ComponentChildren | void}
+ */
+Component.prototype.render = Fragment;
+
+/**
+ * @param {import('./internal').VNode} vnode
+ * @param {number | null} [childIndex]
+ */
+export function getDomSibling(vnode, childIndex) {
+	if (childIndex == null) {
+		// Use childIndex==null as a signal to resume the search from the vnode's sibling
+		return vnode._parent
+			? getDomSibling(vnode._parent, vnode._parent._children.indexOf(vnode) + 1)
+			: null;
+	}
+
+	let sibling;
+	for (; childIndex < vnode._children.length; childIndex++) {
+		sibling = vnode._children[childIndex];
+
+		if (sibling != null && sibling._dom != null) {
+			// Since updateParentDomPointers keeps _dom pointer correct,
+			// we can rely on _dom to tell us if this subtree contains a
+			// rendered DOM node, and what the first rendered DOM node is
+			return sibling._dom;
+		}
+	}
+
+	// If we get here, we have not found a DOM node in this vnode's children.
+	// We must resume from this vnode's sibling (in it's parent _children array)
+	// Only climb up and search the parent if we aren't searching through a DOM
+	// VNode (meaning we reached the DOM parent of the original vnode that began
+	// the search)
+	return typeof vnode.type == 'function' ? getDomSibling(vnode) : null;
+}
+
+/**
+ * Trigger in-place re-rendering of a component.
+ * @param {import('./internal').Component} component The component to rerender
+ */
+function renderComponent(component) {
+	let vnode = component._vnode,
+		oldDom = vnode._dom,
+		parentDom = component._parentDom;
+
+	if (parentDom) {
+		let commitQueue = [];
+		const oldVNode = assign({}, vnode);
+		oldVNode._original = vnode._original + 1;
+
+		diff(
+			parentDom,
+			vnode,
+			oldVNode,
+			component._globalContext,
+			parentDom.ownerSVGElement !== undefined,
+			vnode._hydrating != null ? [oldDom] : null,
+			commitQueue,
+			oldDom == null ? getDomSibling(vnode) : oldDom,
+			vnode._hydrating
+		);
+		commitRoot(commitQueue, vnode);
+
+		if (vnode._dom != oldDom) {
+			updateParentDomPointers(vnode);
+		}
+	}
+}
+
+/**
+ * @param {import('./internal').VNode} vnode
+ */
+function updateParentDomPointers(vnode) {
+	if ((vnode = vnode._parent) != null && vnode._component != null) {
+		vnode._dom = vnode._component.base = null;
+		for (let i = 0; i < vnode._children.length; i++) {
+			let child = vnode._children[i];
+			if (child != null && child._dom != null) {
+				vnode._dom = vnode._component.base = child._dom;
+				break;
+			}
+		}
+
+		return updateParentDomPointers(vnode);
+	}
+}
+
+/**
+ * The render queue
+ * @type {Array<import('./internal').Component>}
+ */
+let rerenderQueue = [];
+
+/*
+ * The value of `Component.debounce` must asynchronously invoke the passed in callback. It is
+ * important that contributors to Preact can consistently reason about what calls to `setState`, etc.
+ * do, and when their effects will be applied. See the links below for some further reading on designing
+ * asynchronous APIs.
+ * * [Designing APIs for Asynchrony](https://blog.izs.me/2013/08/designing-apis-for-asynchrony)
+ * * [Callbacks synchronous and asynchronous](https://blog.ometer.com/2011/07/24/callbacks-synchronous-and-asynchronous/)
+ */
+
+let prevDebounce;
+
+const microTick =
+	typeof Promise == 'function'
+		? Promise.prototype.then.bind(Promise.resolve())
+		: setTimeout;
+function defer(cb) {
+	if (inEvent) {
+		setTimeout(cb);
+	} else {
+		microTick(cb);
+	}
+}
+
+/**
+ * Enqueue a rerender of a component
+ * @param {import('./internal').Component} c The component to rerender
+ */
+export function enqueueRender(c) {
+	if (
+		(!c._dirty &&
+			(c._dirty = true) &&
+			rerenderQueue.push(c) &&
+			!process._rerenderCount++) ||
+		prevDebounce !== options.debounceRendering
+	) {
+		prevDebounce = options.debounceRendering;
+		(prevDebounce || defer)(process);
+	}
+}
+
+/** Flush the render queue by rerendering all queued components */
+function process() {
+	let c;
+	rerenderQueue.sort((a, b) => a._vnode._depth - b._vnode._depth);
+	// Don't update `renderCount` yet. Keep its value non-zero to prevent unnecessary
+	// process() calls from getting scheduled while `queue` is still being consumed.
+	while ((c = rerenderQueue.shift())) {
+		if (c._dirty) {
+			let renderQueueLength = rerenderQueue.length;
+			renderComponent(c);
+			if (rerenderQueue.length > renderQueueLength) {
+				// When i.e. rerendering a provider additional new items can be injected, we want to
+				// keep the order from top to bottom with those new items so we can handle them in a
+				// single pass
+				rerenderQueue.sort((a, b) => a._vnode._depth - b._vnode._depth);
+			}
+		}
+	}
+	process._rerenderCount = 0;
+}
+
+process._rerenderCount = 0;

backend/node_modules/preact/src/constants.js

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+export const EMPTY_OBJ = {};
+export const EMPTY_ARR = [];
+export const IS_NON_DIMENSIONAL = /acit|ex(?:s|g|n|p|$)|rph|grid|ows|mnc|ntw|ine[ch]|zoo|^ord|itera/i;

backend/node_modules/preact/src/create-context.js

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+import { enqueueRender } from './component';
+
+export let i = 0;
+
+export function createContext(defaultValue, contextId) {
+	contextId = '__cC' + i++;
+
+	const context = {
+		_id: contextId,
+		_defaultValue: defaultValue,
+		/** @type {import('./internal').FunctionComponent} */
+		Consumer(props, contextValue) {
+			// return props.children(
+			// 	context[contextId] ? context[contextId].props.value : defaultValue
+			// );
+			return props.children(contextValue);
+		},
+		/** @type {import('./internal').FunctionComponent} */
+		Provider(props) {
+			if (!this.getChildContext) {
+				/** @type {import('./internal').Component[]} */
+				let subs = [];
+				let ctx = {};
+				ctx[contextId] = this;
+
+				this.getChildContext = () => ctx;
+
+				this.shouldComponentUpdate = function(_props) {
+					if (this.props.value !== _props.value) {
+						// I think the forced value propagation here was only needed when `options.debounceRendering` was being bypassed:
+						// https://github.com/preactjs/preact/commit/4d339fb803bea09e9f198abf38ca1bf8ea4b7771#diff-54682ce380935a717e41b8bfc54737f6R358
+						// In those cases though, even with the value corrected, we're double-rendering all nodes.
+						// It might be better to just tell folks not to use force-sync mode.
+						// Currently, using `useContext()` in a class component will overwrite its `this.context` value.
+						// subs.some(c => {
+						// 	c.context = _props.value;
+						// 	enqueueRender(c);
+						// });
+
+						// subs.some(c => {
+						// 	c.context[contextId] = _props.value;
+						// 	enqueueRender(c);
+						// });
+						subs.some(c => {
+							c._force = true;
+							enqueueRender(c);
+						});
+					}
+				};
+
+				this.sub = c => {
+					subs.push(c);
+					let old = c.componentWillUnmount;
+					c.componentWillUnmount = () => {
+						subs.splice(subs.indexOf(c), 1);
+						if (old) old.call(c);
+					};
+				};
+			}
+
+			return props.children;
+		}
+	};
+
+	// Devtools needs access to the context object when it
+	// encounters a Provider. This is necessary to support
+	// setting `displayName` on the context object instead
+	// of on the component itself. See:
+	// https://reactjs.org/docs/context.html#contextdisplayname
+
+	return (context.Provider._contextRef = context.Consumer.contextType = context);
+}

backend/node_modules/preact/src/create-element.js

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+import { slice } from './util';
+import options from './options';
+
+let vnodeId = 0;
+
+/**
+ * Create an virtual node (used for JSX)
+ * @param {import('./internal').VNode["type"]} type The node name or Component
+ * constructor for this virtual node
+ * @param {object | null | undefined} [props] The properties of the virtual node
+ * @param {Array<import('.').ComponentChildren>} [children] The children of the virtual node
+ * @returns {import('./internal').VNode}
+ */
+export function createElement(type, props, children) {
+	let normalizedProps = {},
+		key,
+		ref,
+		i;
+	for (i in props) {
+		if (i == 'key') key = props[i];
+		else if (i == 'ref') ref = props[i];
+		else normalizedProps[i] = props[i];
+	}
+
+	if (arguments.length > 2) {
+		normalizedProps.children =
+			arguments.length > 3 ? slice.call(arguments, 2) : children;
+	}
+
+	// If a Component VNode, check for and apply defaultProps
+	// Note: type may be undefined in development, must never error here.
+	if (typeof type == 'function' && type.defaultProps != null) {
+		for (i in type.defaultProps) {
+			if (normalizedProps[i] === undefined) {
+				normalizedProps[i] = type.defaultProps[i];
+			}
+		}
+	}
+
+	return createVNode(type, normalizedProps, key, ref, null);
+}
+
+/**
+ * Create a VNode (used internally by Preact)
+ * @param {import('./internal').VNode["type"]} type The node name or Component
+ * Constructor for this virtual node
+ * @param {object | string | number | null} props The properties of this virtual node.
+ * If this virtual node represents a text node, this is the text of the node (string or number).
+ * @param {string | number | null} key The key for this virtual node, used when
+ * diffing it against its children
+ * @param {import('./internal').VNode["ref"]} ref The ref property that will
+ * receive a reference to its created child
+ * @returns {import('./internal').VNode}
+ */
+export function createVNode(type, props, key, ref, original) {
+	// V8 seems to be better at detecting type shapes if the object is allocated from the same call site
+	// Do not inline into createElement and coerceToVNode!
+	const vnode = {
+		type,
+		props,
+		key,
+		ref,
+		_children: null,
+		_parent: null,
+		_depth: 0,
+		_dom: null,
+		// _nextDom must be initialized to undefined b/c it will eventually
+		// be set to dom.nextSibling which can return `null` and it is important
+		// to be able to distinguish between an uninitialized _nextDom and
+		// a _nextDom that has been set to `null`
+		_nextDom: undefined,
+		_component: null,
+		_hydrating: null,
+		constructor: undefined,
+		_original: original == null ? ++vnodeId : original
+	};
+
+	// Only invoke the vnode hook if this was *not* a direct copy:
+	if (original == null && options.vnode != null) options.vnode(vnode);
+
+	return vnode;
+}
+
+export function createRef() {
+	return { current: null };
+}
+
+export function Fragment(props) {
+	return props.children;
+}
+
+/**
+ * Check if a the argument is a valid Preact VNode.
+ * @param {*} vnode
+ * @returns {vnode is import('./internal').VNode}
+ */
+export const isValidElement = vnode =>
+	vnode != null && vnode.constructor === undefined;

backend/node_modules/preact/src/diff/catch-error.js

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+/**
+ * Find the closest error boundary to a thrown error and call it
+ * @param {object} error The thrown value
+ * @param {import('../internal').VNode} vnode The vnode that threw
+ * the error that was caught (except for unmounting when this parameter
+ * is the highest parent that was being unmounted)
+ * @param {import('../internal').VNode} [oldVNode]
+ * @param {import('../internal').ErrorInfo} [errorInfo]
+ */
+export function _catchError(error, vnode, oldVNode, errorInfo) {
+	/** @type {import('../internal').Component} */
+	let component, ctor, handled;
+
+	for (; (vnode = vnode._parent); ) {
+		if ((component = vnode._component) && !component._processingException) {
+			try {
+				ctor = component.constructor;
+
+				if (ctor && ctor.getDerivedStateFromError != null) {
+					component.setState(ctor.getDerivedStateFromError(error));
+					handled = component._dirty;
+				}
+
+				if (component.componentDidCatch != null) {
+					component.componentDidCatch(error, errorInfo || {});
+					handled = component._dirty;
+				}
+
+				// This is an error boundary. Mark it as having bailed out, and whether it was mid-hydration.
+				if (handled) {
+					return (component._pendingError = component);
+				}
+			} catch (e) {
+				error = e;
+			}
+		}
+	}
+
+	throw error;
+}

backend/node_modules/preact/src/diff/children.js

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+import { diff, unmount, applyRef } from './index';
+import { createVNode, Fragment } from '../create-element';
+import { EMPTY_OBJ, EMPTY_ARR } from '../constants';
+import { getDomSibling } from '../component';
+
+/**
+ * Diff the children of a virtual node
+ * @param {import('../internal').PreactElement} parentDom The DOM element whose
+ * children are being diffed
+ * @param {import('../internal').ComponentChildren[]} renderResult
+ * @param {import('../internal').VNode} newParentVNode The new virtual
+ * node whose children should be diff'ed against oldParentVNode
+ * @param {import('../internal').VNode} oldParentVNode The old virtual
+ * node whose children should be diff'ed against newParentVNode
+ * @param {object} globalContext The current context object - modified by getChildContext
+ * @param {boolean} isSvg Whether or not this DOM node is an SVG node
+ * @param {Array<import('../internal').PreactElement>} excessDomChildren
+ * @param {Array<import('../internal').Component>} commitQueue List of components
+ * which have callbacks to invoke in commitRoot
+ * @param {import('../internal').PreactElement} oldDom The current attached DOM
+ * element any new dom elements should be placed around. Likely `null` on first
+ * render (except when hydrating). Can be a sibling DOM element when diffing
+ * Fragments that have siblings. In most cases, it starts out as `oldChildren[0]._dom`.
+ * @param {boolean} isHydrating Whether or not we are in hydration
+ */
+export function diffChildren(
+	parentDom,
+	renderResult,
+	newParentVNode,
+	oldParentVNode,
+	globalContext,
+	isSvg,
+	excessDomChildren,
+	commitQueue,
+	oldDom,
+	isHydrating
+) {
+	let i, j, oldVNode, childVNode, newDom, firstChildDom, refs;
+
+	// This is a compression of oldParentVNode!=null && oldParentVNode != EMPTY_OBJ && oldParentVNode._children || EMPTY_ARR
+	// as EMPTY_OBJ._children should be `undefined`.
+	let oldChildren = (oldParentVNode && oldParentVNode._children) || EMPTY_ARR;
+
+	let oldChildrenLength = oldChildren.length;
+
+	newParentVNode._children = [];
+	for (i = 0; i < renderResult.length; i++) {
+		childVNode = renderResult[i];
+
+		if (childVNode == null || typeof childVNode == 'boolean') {
+			childVNode = newParentVNode._children[i] = null;
+		}
+		// If this newVNode is being reused (e.g. <div>{reuse}{reuse}</div>) in the same diff,
+		// or we are rendering a component (e.g. setState) copy the oldVNodes so it can have
+		// it's own DOM & etc. pointers
+		else if (
+			typeof childVNode == 'string' ||
+			typeof childVNode == 'number' ||
+			// eslint-disable-next-line valid-typeof
+			typeof childVNode == 'bigint'
+		) {
+			childVNode = newParentVNode._children[i] = createVNode(
+				null,
+				childVNode,
+				null,
+				null,
+				childVNode
+			);
+		} else if (Array.isArray(childVNode)) {
+			childVNode = newParentVNode._children[i] = createVNode(
+				Fragment,
+				{ children: childVNode },
+				null,
+				null,
+				null
+			);
+		} else if (childVNode._depth > 0) {
+			// VNode is already in use, clone it. This can happen in the following
+			// scenario:
+			//   const reuse = <div />
+			//   <div>{reuse}<span />{reuse}</div>
+			childVNode = newParentVNode._children[i] = createVNode(
+				childVNode.type,
+				childVNode.props,
+				childVNode.key,
+				childVNode.ref ? childVNode.ref : null,
+				childVNode._original
+			);
+		} else {
+			childVNode = newParentVNode._children[i] = childVNode;
+		}
+
+		// Terser removes the `continue` here and wraps the loop body
+		// in a `if (childVNode) { ... } condition
+		if (childVNode == null) {
+			continue;
+		}
+
+		childVNode._parent = newParentVNode;
+		childVNode._depth = newParentVNode._depth + 1;
+
+		// Check if we find a corresponding element in oldChildren.
+		// If found, delete the array item by setting to `undefined`.
+		// We use `undefined`, as `null` is reserved for empty placeholders
+		// (holes).
+		oldVNode = oldChildren[i];
+
+		if (
+			oldVNode === null ||
+			(oldVNode &&
+				childVNode.key == oldVNode.key &&
+				childVNode.type === oldVNode.type)
+		) {
+			oldChildren[i] = undefined;
+		} else {
+			// Either oldVNode === undefined or oldChildrenLength > 0,
+			// so after this loop oldVNode == null or oldVNode is a valid value.
+			for (j = 0; j < oldChildrenLength; j++) {
+				oldVNode = oldChildren[j];
+				// If childVNode is unkeyed, we only match similarly unkeyed nodes, otherwise we match by key.
+				// We always match by type (in either case).
+				if (
+					oldVNode &&
+					childVNode.key == oldVNode.key &&
+					childVNode.type === oldVNode.type
+				) {
+					oldChildren[j] = undefined;
+					break;
+				}
+				oldVNode = null;
+			}
+		}
+
+		oldVNode = oldVNode || EMPTY_OBJ;
+
+		// Morph the old element into the new one, but don't append it to the dom yet
+		diff(
+			parentDom,
+			childVNode,
+			oldVNode,
+			globalContext,
+			isSvg,
+			excessDomChildren,
+			commitQueue,
+			oldDom,
+			isHydrating
+		);
+
+		newDom = childVNode._dom;
+
+		if ((j = childVNode.ref) && oldVNode.ref != j) {
+			if (!refs) refs = [];
+			if (oldVNode.ref) refs.push(oldVNode.ref, null, childVNode);
+			refs.push(j, childVNode._component || newDom, childVNode);
+		}
+
+		if (newDom != null) {
+			if (firstChildDom == null) {
+				firstChildDom = newDom;
+			}
+
+			if (
+				typeof childVNode.type == 'function' &&
+				childVNode._children === oldVNode._children
+			) {
+				childVNode._nextDom = oldDom = reorderChildren(
+					childVNode,
+					oldDom,
+					parentDom
+				);
+			} else {
+				oldDom = placeChild(
+					parentDom,
+					childVNode,
+					oldVNode,
+					oldChildren,
+					newDom,
+					oldDom
+				);
+			}
+
+			if (typeof newParentVNode.type == 'function') {
+				// Because the newParentVNode is Fragment-like, we need to set it's
+				// _nextDom property to the nextSibling of its last child DOM node.
+				//
+				// `oldDom` contains the correct value here because if the last child
+				// is a Fragment-like, then oldDom has already been set to that child's _nextDom.
+				// If the last child is a DOM VNode, then oldDom will be set to that DOM
+				// node's nextSibling.
+				newParentVNode._nextDom = oldDom;
+			}
+		} else if (
+			oldDom &&
+			oldVNode._dom == oldDom &&
+			oldDom.parentNode != parentDom
+		) {
+			// The above condition is to handle null placeholders. See test in placeholder.test.js:
+			// `efficiently replace null placeholders in parent rerenders`
+			oldDom = getDomSibling(oldVNode);
+		}
+	}
+
+	newParentVNode._dom = firstChildDom;
+
+	// Remove remaining oldChildren if there are any.
+	for (i = oldChildrenLength; i--; ) {
+		if (oldChildren[i] != null) {
+			if (
+				typeof newParentVNode.type == 'function' &&
+				oldChildren[i]._dom != null &&
+				oldChildren[i]._dom == newParentVNode._nextDom
+			) {
+				// If the newParentVNode.__nextDom points to a dom node that is about to
+				// be unmounted, then get the next sibling of that vnode and set
+				// _nextDom to it
+				newParentVNode._nextDom = getLastDom(oldParentVNode).nextSibling;
+			}
+
+			unmount(oldChildren[i], oldChildren[i]);
+		}
+	}
+
+	// Set refs only after unmount
+	if (refs) {
+		for (i = 0; i < refs.length; i++) {
+			applyRef(refs[i], refs[++i], refs[++i]);
+		}
+	}
+}
+
+function reorderChildren(childVNode, oldDom, parentDom) {
+	// Note: VNodes in nested suspended trees may be missing _children.
+	let c = childVNode._children;
+	let tmp = 0;
+	for (; c && tmp < c.length; tmp++) {
+		let vnode = c[tmp];
+		if (vnode) {
+			// We typically enter this code path on sCU bailout, where we copy
+			// oldVNode._children to newVNode._children. If that is the case, we need
+			// to update the old children's _parent pointer to point to the newVNode
+			// (childVNode here).
+			vnode._parent = childVNode;
+
+			if (typeof vnode.type == 'function') {
+				oldDom = reorderChildren(vnode, oldDom, parentDom);
+			} else {
+				oldDom = placeChild(parentDom, vnode, vnode, c, vnode._dom, oldDom);
+			}
+		}
+	}
+
+	return oldDom;
+}
+
+/**
+ * Flatten and loop through the children of a virtual node
+ * @param {import('../index').ComponentChildren} children The unflattened
+ * children of a virtual node
+ * @returns {import('../internal').VNode[]}
+ */
+export function toChildArray(children, out) {
+	out = out || [];
+	if (children == null || typeof children == 'boolean') {
+	} else if (Array.isArray(children)) {
+		children.some(child => {
+			toChildArray(child, out);
+		});
+	} else {
+		out.push(children);
+	}
+	return out;
+}
+
+function placeChild(
+	parentDom,
+	childVNode,
+	oldVNode,
+	oldChildren,
+	newDom,
+	oldDom
+) {
+	let nextDom;
+	if (childVNode._nextDom !== undefined) {
+		// Only Fragments or components that return Fragment like VNodes will
+		// have a non-undefined _nextDom. Continue the diff from the sibling
+		// of last DOM child of this child VNode
+		nextDom = childVNode._nextDom;
+
+		// Eagerly cleanup _nextDom. We don't need to persist the value because
+		// it is only used by `diffChildren` to determine where to resume the diff after
+		// diffing Components and Fragments. Once we store it the nextDOM local var, we
+		// can clean up the property
+		childVNode._nextDom = undefined;
+	} else if (
+		oldVNode == null ||
+		newDom != oldDom ||
+		newDom.parentNode == null
+	) {
+		outer: if (oldDom == null || oldDom.parentNode !== parentDom) {
+			parentDom.appendChild(newDom);
+			nextDom = null;
+		} else {
+			// `j<oldChildrenLength; j+=2` is an alternative to `j++<oldChildrenLength/2`
+			for (
+				let sibDom = oldDom, j = 0;
+				(sibDom = sibDom.nextSibling) && j < oldChildren.length;
+				j += 1
+			) {
+				if (sibDom == newDom) {
+					break outer;
+				}
+			}
+			parentDom.insertBefore(newDom, oldDom);
+			nextDom = oldDom;
+		}
+	}
+
+	// If we have pre-calculated the nextDOM node, use it. Else calculate it now
+	// Strictly check for `undefined` here cuz `null` is a valid value of `nextDom`.
+	// See more detail in create-element.js:createVNode
+	if (nextDom !== undefined) {
+		oldDom = nextDom;
+	} else {
+		oldDom = newDom.nextSibling;
+	}
+
+	return oldDom;
+}
+
+/**
+ * @param {import('../internal').VNode} vnode
+ */
+function getLastDom(vnode) {
+	if (vnode.type == null || typeof vnode.type === 'string') {
+		return vnode._dom;
+	}
+
+	if (vnode._children) {
+		for (let i = vnode._children.length - 1; i >= 0; i--) {
+			let child = vnode._children[i];
+			if (child) {
+				let lastDom = getLastDom(child);
+				if (lastDom) {
+					return lastDom;
+				}
+			}
+		}
+	}
+
+	return null;
+}

backend/node_modules/preact/src/diff/index.js

@@ -0,0 +1,560 @@
+import { EMPTY_OBJ } from '../constants';
+import { Component, getDomSibling } from '../component';
+import { Fragment } from '../create-element';
+import { diffChildren } from './children';
+import { diffProps, setProperty } from './props';
+import { assign, removeNode, slice } from '../util';
+import options from '../options';
+
+/**
+ * Diff two virtual nodes and apply proper changes to the DOM
+ * @param {import('../internal').PreactElement} parentDom The parent of the DOM element
+ * @param {import('../internal').VNode} newVNode The new virtual node
+ * @param {import('../internal').VNode} oldVNode The old virtual node
+ * @param {object} globalContext The current context object. Modified by getChildContext
+ * @param {boolean} isSvg Whether or not this element is an SVG node
+ * @param {Array<import('../internal').PreactElement>} excessDomChildren
+ * @param {Array<import('../internal').Component>} commitQueue List of components
+ * which have callbacks to invoke in commitRoot
+ * @param {import('../internal').PreactElement} oldDom The current attached DOM
+ * element any new dom elements should be placed around. Likely `null` on first
+ * render (except when hydrating). Can be a sibling DOM element when diffing
+ * Fragments that have siblings. In most cases, it starts out as `oldChildren[0]._dom`.
+ * @param {boolean} [isHydrating] Whether or not we are in hydration
+ */
+export function diff(
+	parentDom,
+	newVNode,
+	oldVNode,
+	globalContext,
+	isSvg,
+	excessDomChildren,
+	commitQueue,
+	oldDom,
+	isHydrating
+) {
+	let tmp,
+		newType = newVNode.type;
+
+	// When passing through createElement it assigns the object
+	// constructor as undefined. This to prevent JSON-injection.
+	if (newVNode.constructor !== undefined) return null;
+
+	// If the previous diff bailed out, resume creating/hydrating.
+	if (oldVNode._hydrating != null) {
+		isHydrating = oldVNode._hydrating;
+		oldDom = newVNode._dom = oldVNode._dom;
+		// if we resume, we want the tree to be "unlocked"
+		newVNode._hydrating = null;
+		excessDomChildren = [oldDom];
+	}
+
+	if ((tmp = options._diff)) tmp(newVNode);
+
+	try {
+		outer: if (typeof newType == 'function') {
+			let c, isNew, oldProps, oldState, snapshot, clearProcessingException;
+			let newProps = newVNode.props;
+
+			// Necessary for createContext api. Setting this property will pass
+			// the context value as `this.context` just for this component.
+			tmp = newType.contextType;
+			let provider = tmp && globalContext[tmp._id];
+			let componentContext = tmp
+				? provider
+					? provider.props.value
+					: tmp._defaultValue
+				: globalContext;
+
+			// Get component and set it to `c`
+			if (oldVNode._component) {
+				c = newVNode._component = oldVNode._component;
+				clearProcessingException = c._processingException = c._pendingError;
+			} else {
+				// Instantiate the new component
+				if ('prototype' in newType && newType.prototype.render) {
+					// @ts-ignore The check above verifies that newType is suppose to be constructed
+					newVNode._component = c = new newType(newProps, componentContext); // eslint-disable-line new-cap
+				} else {
+					// @ts-ignore Trust me, Component implements the interface we want
+					newVNode._component = c = new Component(newProps, componentContext);
+					c.constructor = newType;
+					c.render = doRender;
+				}
+				if (provider) provider.sub(c);
+
+				c.props = newProps;
+				if (!c.state) c.state = {};
+				c.context = componentContext;
+				c._globalContext = globalContext;
+				isNew = c._dirty = true;
+				c._renderCallbacks = [];
+				c._stateCallbacks = [];
+			}
+
+			// Invoke getDerivedStateFromProps
+			if (c._nextState == null) {
+				c._nextState = c.state;
+			}
+
+			if (newType.getDerivedStateFromProps != null) {
+				if (c._nextState == c.state) {
+					c._nextState = assign({}, c._nextState);
+				}
+
+				assign(
+					c._nextState,
+					newType.getDerivedStateFromProps(newProps, c._nextState)
+				);
+			}
+
+			oldProps = c.props;
+			oldState = c.state;
+			c._vnode = newVNode;
+
+			// Invoke pre-render lifecycle methods
+			if (isNew) {
+				if (
+					newType.getDerivedStateFromProps == null &&
+					c.componentWillMount != null
+				) {
+					c.componentWillMount();
+				}
+
+				if (c.componentDidMount != null) {
+					c._renderCallbacks.push(c.componentDidMount);
+				}
+			} else {
+				if (
+					newType.getDerivedStateFromProps == null &&
+					newProps !== oldProps &&
+					c.componentWillReceiveProps != null
+				) {
+					c.componentWillReceiveProps(newProps, componentContext);
+				}
+
+				if (
+					(!c._force &&
+						c.shouldComponentUpdate != null &&
+						c.shouldComponentUpdate(
+							newProps,
+							c._nextState,
+							componentContext
+						) === false) ||
+					newVNode._original === oldVNode._original
+				) {
+					// More info about this here: https://gist.github.com/JoviDeCroock/bec5f2ce93544d2e6070ef8e0036e4e8
+					if (newVNode._original !== oldVNode._original) {
+						// When we are dealing with a bail because of sCU we have to update
+						// the props, state and dirty-state.
+						// when we are dealing with strict-equality we don't as the child could still
+						// be dirtied see #3883
+						c.props = newProps;
+						c.state = c._nextState;
+						c._dirty = false;
+					}
+					newVNode._dom = oldVNode._dom;
+					newVNode._children = oldVNode._children;
+					newVNode._children.forEach(vnode => {
+						if (vnode) vnode._parent = newVNode;
+					});
+
+					for (let i = 0; i < c._stateCallbacks.length; i++) {
+						c._renderCallbacks.push(c._stateCallbacks[i]);
+					}
+					c._stateCallbacks = [];
+
+					if (c._renderCallbacks.length) {
+						commitQueue.push(c);
+					}
+
+					break outer;
+				}
+
+				if (c.componentWillUpdate != null) {
+					c.componentWillUpdate(newProps, c._nextState, componentContext);
+				}
+
+				if (c.componentDidUpdate != null) {
+					c._renderCallbacks.push(() => {
+						c.componentDidUpdate(oldProps, oldState, snapshot);
+					});
+				}
+			}
+
+			c.context = componentContext;
+			c.props = newProps;
+			c._parentDom = parentDom;
+
+			let renderHook = options._render,
+				count = 0;
+			if ('prototype' in newType && newType.prototype.render) {
+				c.state = c._nextState;
+				c._dirty = false;
+
+				if (renderHook) renderHook(newVNode);
+
+				tmp = c.render(c.props, c.state, c.context);
+
+				for (let i = 0; i < c._stateCallbacks.length; i++) {
+					c._renderCallbacks.push(c._stateCallbacks[i]);
+				}
+				c._stateCallbacks = [];
+			} else {
+				do {
+					c._dirty = false;
+					if (renderHook) renderHook(newVNode);
+
+					tmp = c.render(c.props, c.state, c.context);
+
+					// Handle setState called in render, see #2553
+					c.state = c._nextState;
+				} while (c._dirty && ++count < 25);
+			}
+
+			// Handle setState called in render, see #2553
+			c.state = c._nextState;
+
+			if (c.getChildContext != null) {
+				globalContext = assign(assign({}, globalContext), c.getChildContext());
+			}
+
+			if (!isNew && c.getSnapshotBeforeUpdate != null) {
+				snapshot = c.getSnapshotBeforeUpdate(oldProps, oldState);
+			}
+
+			let isTopLevelFragment =
+				tmp != null && tmp.type === Fragment && tmp.key == null;
+			let renderResult = isTopLevelFragment ? tmp.props.children : tmp;
+
+			diffChildren(
+				parentDom,
+				Array.isArray(renderResult) ? renderResult : [renderResult],
+				newVNode,
+				oldVNode,
+				globalContext,
+				isSvg,
+				excessDomChildren,
+				commitQueue,
+				oldDom,
+				isHydrating
+			);
+
+			c.base = newVNode._dom;
+
+			// We successfully rendered this VNode, unset any stored hydration/bailout state:
+			newVNode._hydrating = null;
+
+			if (c._renderCallbacks.length) {
+				commitQueue.push(c);
+			}
+
+			if (clearProcessingException) {
+				c._pendingError = c._processingException = null;
+			}
+
+			c._force = false;
+		} else if (
+			excessDomChildren == null &&
+			newVNode._original === oldVNode._original
+		) {
+			newVNode._children = oldVNode._children;
+			newVNode._dom = oldVNode._dom;
+		} else {
+			newVNode._dom = diffElementNodes(
+				oldVNode._dom,
+				newVNode,
+				oldVNode,
+				globalContext,
+				isSvg,
+				excessDomChildren,
+				commitQueue,
+				isHydrating
+			);
+		}
+
+		if ((tmp = options.diffed)) tmp(newVNode);
+	} catch (e) {
+		newVNode._original = null;
+		// if hydrating or creating initial tree, bailout preserves DOM:
+		if (isHydrating || excessDomChildren != null) {
+			newVNode._dom = oldDom;
+			newVNode._hydrating = !!isHydrating;
+			excessDomChildren[excessDomChildren.indexOf(oldDom)] = null;
+			// ^ could possibly be simplified to:
+			// excessDomChildren.length = 0;
+		}
+		options._catchError(e, newVNode, oldVNode);
+	}
+}
+
+/**
+ * @param {Array<import('../internal').Component>} commitQueue List of components
+ * which have callbacks to invoke in commitRoot
+ * @param {import('../internal').VNode} root
+ */
+export function commitRoot(commitQueue, root) {
+	if (options._commit) options._commit(root, commitQueue);
+
+	commitQueue.some(c => {
+		try {
+			// @ts-ignore Reuse the commitQueue variable here so the type changes
+			commitQueue = c._renderCallbacks;
+			c._renderCallbacks = [];
+			commitQueue.some(cb => {
+				// @ts-ignore See above ts-ignore on commitQueue
+				cb.call(c);
+			});
+		} catch (e) {
+			options._catchError(e, c._vnode);
+		}
+	});
+}
+
+/**
+ * Diff two virtual nodes representing DOM element
+ * @param {import('../internal').PreactElement} dom The DOM element representing
+ * the virtual nodes being diffed
+ * @param {import('../internal').VNode} newVNode The new virtual node
+ * @param {import('../internal').VNode} oldVNode The old virtual node
+ * @param {object} globalContext The current context object
+ * @param {boolean} isSvg Whether or not this DOM node is an SVG node
+ * @param {*} excessDomChildren
+ * @param {Array<import('../internal').Component>} commitQueue List of components
+ * which have callbacks to invoke in commitRoot
+ * @param {boolean} isHydrating Whether or not we are in hydration
+ * @returns {import('../internal').PreactElement}
+ */
+function diffElementNodes(
+	dom,
+	newVNode,
+	oldVNode,
+	globalContext,
+	isSvg,
+	excessDomChildren,
+	commitQueue,
+	isHydrating
+) {
+	let oldProps = oldVNode.props;
+	let newProps = newVNode.props;
+	let nodeType = newVNode.type;
+	let i = 0;
+
+	// Tracks entering and exiting SVG namespace when descending through the tree.
+	if (nodeType === 'svg') isSvg = true;
+
+	if (excessDomChildren != null) {
+		for (; i < excessDomChildren.length; i++) {
+			const child = excessDomChildren[i];
+
+			// if newVNode matches an element in excessDomChildren or the `dom`
+			// argument matches an element in excessDomChildren, remove it from
+			// excessDomChildren so it isn't later removed in diffChildren
+			if (
+				child &&
+				'setAttribute' in child === !!nodeType &&
+				(nodeType ? child.localName === nodeType : child.nodeType === 3)
+			) {
+				dom = child;
+				excessDomChildren[i] = null;
+				break;
+			}
+		}
+	}
+
+	if (dom == null) {
+		if (nodeType === null) {
+			// @ts-ignore createTextNode returns Text, we expect PreactElement
+			return document.createTextNode(newProps);
+		}
+
+		if (isSvg) {
+			dom = document.createElementNS(
+				'http://www.w3.org/2000/svg',
+				// @ts-ignore We know `newVNode.type` is a string
+				nodeType
+			);
+		} else {
+			dom = document.createElement(
+				// @ts-ignore We know `newVNode.type` is a string
+				nodeType,
+				newProps.is && newProps
+			);
+		}
+
+		// we created a new parent, so none of the previously attached children can be reused:
+		excessDomChildren = null;
+		// we are creating a new node, so we can assume this is a new subtree (in case we are hydrating), this deopts the hydrate
+		isHydrating = false;
+	}
+
+	if (nodeType === null) {
+		// During hydration, we still have to split merged text from SSR'd HTML.
+		if (oldProps !== newProps && (!isHydrating || dom.data !== newProps)) {
+			dom.data = newProps;
+		}
+	} else {
+		// If excessDomChildren was not null, repopulate it with the current element's children:
+		excessDomChildren = excessDomChildren && slice.call(dom.childNodes);
+
+		oldProps = oldVNode.props || EMPTY_OBJ;
+
+		let oldHtml = oldProps.dangerouslySetInnerHTML;
+		let newHtml = newProps.dangerouslySetInnerHTML;
+
+		// During hydration, props are not diffed at all (including dangerouslySetInnerHTML)
+		// @TODO we should warn in debug mode when props don't match here.
+		if (!isHydrating) {
+			// But, if we are in a situation where we are using existing DOM (e.g. replaceNode)
+			// we should read the existing DOM attributes to diff them
+			if (excessDomChildren != null) {
+				oldProps = {};
+				for (i = 0; i < dom.attributes.length; i++) {
+					oldProps[dom.attributes[i].name] = dom.attributes[i].value;
+				}
+			}
+
+			if (newHtml || oldHtml) {
+				// Avoid re-applying the same '__html' if it did not changed between re-render
+				if (
+					!newHtml ||
+					((!oldHtml || newHtml.__html != oldHtml.__html) &&
+						newHtml.__html !== dom.innerHTML)
+				) {
+					dom.innerHTML = (newHtml && newHtml.__html) || '';
+				}
+			}
+		}
+
+		diffProps(dom, newProps, oldProps, isSvg, isHydrating);
+
+		// If the new vnode didn't have dangerouslySetInnerHTML, diff its children
+		if (newHtml) {
+			newVNode._children = [];
+		} else {
+			i = newVNode.props.children;
+			diffChildren(
+				dom,
+				Array.isArray(i) ? i : [i],
+				newVNode,
+				oldVNode,
+				globalContext,
+				isSvg && nodeType !== 'foreignObject',
+				excessDomChildren,
+				commitQueue,
+				excessDomChildren
+					? excessDomChildren[0]
+					: oldVNode._children && getDomSibling(oldVNode, 0),
+				isHydrating
+			);
+
+			// Remove children that are not part of any vnode.
+			if (excessDomChildren != null) {
+				for (i = excessDomChildren.length; i--; ) {
+					if (excessDomChildren[i] != null) removeNode(excessDomChildren[i]);
+				}
+			}
+		}
+
+		// (as above, don't diff props during hydration)
+		if (!isHydrating) {
+			if (
+				'value' in newProps &&
+				(i = newProps.value) !== undefined &&
+				// #2756 For the <progress>-element the initial value is 0,
+				// despite the attribute not being present. When the attribute
+				// is missing the progress bar is treated as indeterminate.
+				// To fix that we'll always update it when it is 0 for progress elements
+				(i !== dom.value ||
+					(nodeType === 'progress' && !i) ||
+					// This is only for IE 11 to fix <select> value not being updated.
+					// To avoid a stale select value we need to set the option.value
+					// again, which triggers IE11 to re-evaluate the select value
+					(nodeType === 'option' && i !== oldProps.value))
+			) {
+				setProperty(dom, 'value', i, oldProps.value, false);
+			}
+			if (
+				'checked' in newProps &&
+				(i = newProps.checked) !== undefined &&
+				i !== dom.checked
+			) {
+				setProperty(dom, 'checked', i, oldProps.checked, false);
+			}
+		}
+	}
+
+	return dom;
+}
+
+/**
+ * Invoke or update a ref, depending on whether it is a function or object ref.
+ * @param {object|function} ref
+ * @param {any} value
+ * @param {import('../internal').VNode} vnode
+ */
+export function applyRef(ref, value, vnode) {
+	try {
+		if (typeof ref == 'function') ref(value);
+		else ref.current = value;
+	} catch (e) {
+		options._catchError(e, vnode);
+	}
+}
+
+/**
+ * Unmount a virtual node from the tree and apply DOM changes
+ * @param {import('../internal').VNode} vnode The virtual node to unmount
+ * @param {import('../internal').VNode} parentVNode The parent of the VNode that
+ * initiated the unmount
+ * @param {boolean} [skipRemove] Flag that indicates that a parent node of the
+ * current element is already detached from the DOM.
+ */
+export function unmount(vnode, parentVNode, skipRemove) {
+	let r;
+	if (options.unmount) options.unmount(vnode);
+
+	if ((r = vnode.ref)) {
+		if (!r.current || r.current === vnode._dom) {
+			applyRef(r, null, parentVNode);
+		}
+	}
+
+	if ((r = vnode._component) != null) {
+		if (r.componentWillUnmount) {
+			try {
+				r.componentWillUnmount();
+			} catch (e) {
+				options._catchError(e, parentVNode);
+			}
+		}
+
+		r.base = r._parentDom = null;
+		vnode._component = undefined;
+	}
+
+	if ((r = vnode._children)) {
+		for (let i = 0; i < r.length; i++) {
+			if (r[i]) {
+				unmount(
+					r[i],
+					parentVNode,
+					skipRemove || typeof vnode.type !== 'function'
+				);
+			}
+		}
+	}
+
+	if (!skipRemove && vnode._dom != null) {
+		removeNode(vnode._dom);
+	}
+
+	// Must be set to `undefined` to properly clean up `_nextDom`
+	// for which `null` is a valid value. See comment in `create-element.js`
+	vnode._parent = vnode._dom = vnode._nextDom = undefined;
+}
+
+/** The `.render()` method for a PFC backing instance. */
+function doRender(props, state, context) {
+	return this.constructor(props, context);
+}

backend/node_modules/preact/src/diff/props.js

@@ -0,0 +1,171 @@
+import { IS_NON_DIMENSIONAL } from '../constants';
+import options from '../options';
+
+/**
+ * Diff the old and new properties of a VNode and apply changes to the DOM node
+ * @param {import('../internal').PreactElement} dom The DOM node to apply
+ * changes to
+ * @param {object} newProps The new props
+ * @param {object} oldProps The old props
+ * @param {boolean} isSvg Whether or not this node is an SVG node
+ * @param {boolean} hydrate Whether or not we are in hydration mode
+ */
+export function diffProps(dom, newProps, oldProps, isSvg, hydrate) {
+	let i;
+
+	for (i in oldProps) {
+		if (i !== 'children' && i !== 'key' && !(i in newProps)) {
+			setProperty(dom, i, null, oldProps[i], isSvg);
+		}
+	}
+
+	for (i in newProps) {
+		if (
+			(!hydrate || typeof newProps[i] == 'function') &&
+			i !== 'children' &&
+			i !== 'key' &&
+			i !== 'value' &&
+			i !== 'checked' &&
+			oldProps[i] !== newProps[i]
+		) {
+			setProperty(dom, i, newProps[i], oldProps[i], isSvg);
+		}
+	}
+}
+
+function setStyle(style, key, value) {
+	if (key[0] === '-') {
+		style.setProperty(key, value == null ? '' : value);
+	} else if (value == null) {
+		style[key] = '';
+	} else if (typeof value != 'number' || IS_NON_DIMENSIONAL.test(key)) {
+		style[key] = value;
+	} else {
+		style[key] = value + 'px';
+	}
+}
+
+/**
+ * Set a property value on a DOM node
+ * @param {import('../internal').PreactElement} dom The DOM node to modify
+ * @param {string} name The name of the property to set
+ * @param {*} value The value to set the property to
+ * @param {*} oldValue The old value the property had
+ * @param {boolean} isSvg Whether or not this DOM node is an SVG node or not
+ */
+export function setProperty(dom, name, value, oldValue, isSvg) {
+	let useCapture;
+
+	o: if (name === 'style') {
+		if (typeof value == 'string') {
+			dom.style.cssText = value;
+		} else {
+			if (typeof oldValue == 'string') {
+				dom.style.cssText = oldValue = '';
+			}
+
+			if (oldValue) {
+				for (name in oldValue) {
+					if (!(value && name in value)) {
+						setStyle(dom.style, name, '');
+					}
+				}
+			}
+
+			if (value) {
+				for (name in value) {
+					if (!oldValue || value[name] !== oldValue[name]) {
+						setStyle(dom.style, name, value[name]);
+					}
+				}
+			}
+		}
+	}
+	// Benchmark for comparison: https://esbench.com/bench/574c954bdb965b9a00965ac6
+	else if (name[0] === 'o' && name[1] === 'n') {
+		useCapture = name !== (name = name.replace(/Capture$/, ''));
+
+		// Infer correct casing for DOM built-in events:
+		if (name.toLowerCase() in dom) name = name.toLowerCase().slice(2);
+		else name = name.slice(2);
+
+		if (!dom._listeners) dom._listeners = {};
+		dom._listeners[name + useCapture] = value;
+
+		if (value) {
+			if (!oldValue) {
+				const handler = useCapture ? eventProxyCapture : eventProxy;
+				dom.addEventListener(name, handler, useCapture);
+			}
+		} else {
+			const handler = useCapture ? eventProxyCapture : eventProxy;
+			dom.removeEventListener(name, handler, useCapture);
+		}
+	} else if (name !== 'dangerouslySetInnerHTML') {
+		if (isSvg) {
+			// Normalize incorrect prop usage for SVG:
+			// - xlink:href / xlinkHref --> href (xlink:href was removed from SVG and isn't needed)
+			// - className --> class
+			name = name.replace(/xlink(H|:h)/, 'h').replace(/sName$/, 's');
+		} else if (
+			name !== 'width' &&
+			name !== 'height' &&
+			name !== 'href' &&
+			name !== 'list' &&
+			name !== 'form' &&
+			// Default value in browsers is `-1` and an empty string is
+			// cast to `0` instead
+			name !== 'tabIndex' &&
+			name !== 'download' &&
+			name in dom
+		) {
+			try {
+				dom[name] = value == null ? '' : value;
+				// labelled break is 1b smaller here than a return statement (sorry)
+				break o;
+			} catch (e) {}
+		}
+
+		// ARIA-attributes have a different notion of boolean values.
+		// The value `false` is different from the attribute not
+		// existing on the DOM, so we can't remove it. For non-boolean
+		// ARIA-attributes we could treat false as a removal, but the
+		// amount of exceptions would cost us too many bytes. On top of
+		// that other VDOM frameworks also always stringify `false`.
+
+		if (typeof value === 'function') {
+			// never serialize functions as attribute values
+		} else if (value != null && (value !== false || name.indexOf('-') != -1)) {
+			dom.setAttribute(name, value);
+		} else {
+			dom.removeAttribute(name);
+		}
+	}
+}
+
+export let inEvent = false;
+
+/**
+ * Proxy an event to hooked event handlers
+ * @param {Event} e The event object from the browser
+ * @private
+ */
+function eventProxy(e) {
+	inEvent = true;
+	try {
+		return this._listeners[e.type + false](
+			options.event ? options.event(e) : e
+		);
+	} finally {
+		inEvent = false;
+	}
+}
+
+function eventProxyCapture(e) {
+	inEvent = true;
+	try {
+		return this._listeners[e.type + true](options.event ? options.event(e) : e);
+	} finally {
+		inEvent = false;
+	}
+}

backend/node_modules/preact/src/index.d.ts

@@ -0,0 +1,384 @@
+export as namespace preact;
+
+import { JSXInternal } from './jsx';
+
+export import JSX = JSXInternal;
+
+//
+// Preact Virtual DOM
+// -----------------------------------
+
+export interface VNode<P = {}> {
+	type: ComponentType<P> | string;
+	props: P & { children: ComponentChildren };
+	key: Key;
+	/**
+	 * ref is not guaranteed by React.ReactElement, for compatibility reasons
+	 * with popular react libs we define it as optional too
+	 */
+	ref?: Ref<any> | null;
+	/**
+	 * The time this `vnode` started rendering. Will only be set when
+	 * the devtools are attached.
+	 * Default value: `0`
+	 */
+	startTime?: number;
+	/**
+	 * The time that the rendering of this `vnode` was completed. Will only be
+	 * set when the devtools are attached.
+	 * Default value: `-1`
+	 */
+	endTime?: number;
+}
+
+//
+// Preact Component interface
+// -----------------------------------
+
+export type Key = string | number | any;
+
+export type RefObject<T> = { current: T | null };
+export type RefCallback<T> = (instance: T | null) => void;
+export type Ref<T> = RefObject<T> | RefCallback<T> | null;
+
+export type ComponentChild =
+	| VNode<any>
+	| object
+	| string
+	| number
+	| bigint
+	| boolean
+	| null
+	| undefined;
+export type ComponentChildren = ComponentChild[] | ComponentChild;
+
+export interface Attributes {
+	key?: Key | undefined;
+	jsx?: boolean | undefined;
+}
+
+export interface ClassAttributes<T> extends Attributes {
+	ref?: Ref<T>;
+}
+
+export interface PreactDOMAttributes {
+	children?: ComponentChildren;
+	dangerouslySetInnerHTML?: {
+		__html: string;
+	};
+}
+
+export interface ErrorInfo {
+	componentStack?: string;
+}
+
+export type RenderableProps<P, RefType = any> = P &
+	Readonly<Attributes & { children?: ComponentChildren; ref?: Ref<RefType> }>;
+
+export type ComponentType<P = {}> = ComponentClass<P> | FunctionComponent<P>;
+export type ComponentFactory<P = {}> = ComponentType<P>;
+
+export type ComponentProps<
+	C extends ComponentType<any> | keyof JSXInternal.IntrinsicElements
+> = C extends ComponentType<infer P>
+	? P
+	: C extends keyof JSXInternal.IntrinsicElements
+	? JSXInternal.IntrinsicElements[C]
+	: never;
+
+export interface FunctionComponent<P = {}> {
+	(props: RenderableProps<P>, context?: any): VNode<any> | null;
+	displayName?: string;
+	defaultProps?: Partial<P>;
+}
+export interface FunctionalComponent<P = {}> extends FunctionComponent<P> {}
+
+export interface ComponentClass<P = {}, S = {}> {
+	new (props: P, context?: any): Component<P, S>;
+	displayName?: string;
+	defaultProps?: Partial<P>;
+	contextType?: Context<any>;
+	getDerivedStateFromProps?(
+		props: Readonly<P>,
+		state: Readonly<S>
+	): Partial<S> | null;
+	getDerivedStateFromError?(error: any): Partial<S> | null;
+}
+export interface ComponentConstructor<P = {}, S = {}>
+	extends ComponentClass<P, S> {}
+
+// Type alias for a component instance considered generally, whether stateless or stateful.
+export type AnyComponent<P = {}, S = {}> =
+	| FunctionComponent<P>
+	| Component<P, S>;
+
+export interface Component<P = {}, S = {}> {
+	componentWillMount?(): void;
+	componentDidMount?(): void;
+	componentWillUnmount?(): void;
+	getChildContext?(): object;
+	componentWillReceiveProps?(nextProps: Readonly<P>, nextContext: any): void;
+	shouldComponentUpdate?(
+		nextProps: Readonly<P>,
+		nextState: Readonly<S>,
+		nextContext: any
+	): boolean;
+	componentWillUpdate?(
+		nextProps: Readonly<P>,
+		nextState: Readonly<S>,
+		nextContext: any
+	): void;
+	getSnapshotBeforeUpdate?(oldProps: Readonly<P>, oldState: Readonly<S>): any;
+	componentDidUpdate?(
+		previousProps: Readonly<P>,
+		previousState: Readonly<S>,
+		snapshot: any
+	): void;
+	componentDidCatch?(error: any, errorInfo: ErrorInfo): void;
+}
+
+export abstract class Component<P, S> {
+	constructor(props?: P, context?: any);
+
+	static displayName?: string;
+	static defaultProps?: any;
+	static contextType?: Context<any>;
+
+	// Static members cannot reference class type parameters. This is not
+	// supported in TypeScript. Reusing the same type arguments from `Component`
+	// will lead to an impossible state where one cannot satisfy the type
+	// constraint under no circumstances, see #1356.In general type arguments
+	// seem to be a bit buggy and not supported well at the time of this
+	// writing with TS 3.3.3333.
+	static getDerivedStateFromProps?(
+		props: Readonly<object>,
+		state: Readonly<object>
+	): object | null;
+	static getDerivedStateFromError?(error: any): object | null;
+
+	state: Readonly<S>;
+	props: RenderableProps<P>;
+	context: any;
+	base?: Element | Text;
+
+	// From https://github.com/DefinitelyTyped/DefinitelyTyped/blob/e836acc75a78cf0655b5dfdbe81d69fdd4d8a252/types/react/index.d.ts#L402
+	// // We MUST keep setState() as a unified signature because it allows proper checking of the method return type.
+	// // See: https://github.com/DefinitelyTyped/DefinitelyTyped/issues/18365#issuecomment-351013257
+	setState<K extends keyof S>(
+		state:
+			| ((
+					prevState: Readonly<S>,
+					props: Readonly<P>
+			  ) => Pick<S, K> | Partial<S> | null)
+			| (Pick<S, K> | Partial<S> | null),
+		callback?: () => void
+	): void;
+
+	forceUpdate(callback?: () => void): void;
+
+	abstract render(
+		props?: RenderableProps<P>,
+		state?: Readonly<S>,
+		context?: any
+	): ComponentChild;
+}
+
+//
+// Preact createElement
+// -----------------------------------
+
+export function createElement(
+	type: 'input',
+	props:
+		| (JSXInternal.DOMAttributes<HTMLInputElement> &
+				ClassAttributes<HTMLInputElement>)
+		| null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export function createElement<
+	P extends JSXInternal.HTMLAttributes<T>,
+	T extends HTMLElement
+>(
+	type: keyof JSXInternal.IntrinsicElements,
+	props: (ClassAttributes<T> & P) | null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export function createElement<
+	P extends JSXInternal.SVGAttributes<T>,
+	T extends HTMLElement
+>(
+	type: keyof JSXInternal.IntrinsicElements,
+	props: (ClassAttributes<T> & P) | null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export function createElement<T extends HTMLElement>(
+	type: string,
+	props:
+		| (ClassAttributes<T> &
+				JSXInternal.HTMLAttributes &
+				JSXInternal.SVGAttributes)
+		| null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export function createElement<P>(
+	type: ComponentType<P>,
+	props: (Attributes & P) | null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export namespace createElement {
+	export import JSX = JSXInternal;
+}
+
+export function h(
+	type: 'input',
+	props:
+		| (JSXInternal.DOMAttributes<HTMLInputElement> &
+				ClassAttributes<HTMLInputElement>)
+		| null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export function h<
+	P extends JSXInternal.HTMLAttributes<T>,
+	T extends HTMLElement
+>(
+	type: keyof JSXInternal.IntrinsicElements,
+	props: (ClassAttributes<T> & P) | null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export function h<
+	P extends JSXInternal.SVGAttributes<T>,
+	T extends HTMLElement
+>(
+	type: keyof JSXInternal.IntrinsicElements,
+	props: (ClassAttributes<T> & P) | null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export function h<T extends HTMLElement>(
+	type: string,
+	props:
+		| (ClassAttributes<T> &
+				JSXInternal.HTMLAttributes &
+				JSXInternal.SVGAttributes)
+		| null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export function h<P>(
+	type: ComponentType<P>,
+	props: (Attributes & P) | null,
+	...children: ComponentChildren[]
+): VNode<any>;
+export namespace h {
+	export import JSX = JSXInternal;
+}
+
+//
+// Preact render
+// -----------------------------------
+
+interface ContainerNode {
+	nodeType: Node['nodeType'];
+	parentNode: Node['parentNode'];
+	firstChild: Node['firstChild'];
+	insertBefore: Node['insertBefore'];
+	appendChild: Node['appendChild'];
+	removeChild: Node['removeChild'];
+	childNodes: ArrayLike<Node>
+}
+
+export function render(
+	vnode: ComponentChild,
+	parent: ContainerNode
+): void;
+/**
+ * @deprecated Will be removed in v11.
+ *
+ * Replacement Preact 10+ implementation can be found here: https://gist.github.com/developit/f4c67a2ede71dc2fab7f357f39cff28c
+ */
+export function render(
+	vnode: ComponentChild,
+	parent: ContainerNode,
+	replaceNode?: Element | Text
+): void;
+export function hydrate(
+	vnode: ComponentChild,
+	parent: ContainerNode
+): void;
+export function cloneElement(
+	vnode: VNode<any>,
+	props?: any,
+	...children: ComponentChildren[]
+): VNode<any>;
+export function cloneElement<P>(
+	vnode: VNode<P>,
+	props?: any,
+	...children: ComponentChildren[]
+): VNode<P>;
+
+//
+// Preact Built-in Components
+// -----------------------------------
+
+// TODO: Revisit what the public type of this is...
+export const Fragment: FunctionComponent<{}>;
+
+//
+// Preact options
+// -----------------------------------
+
+/**
+ * Global options for preact
+ */
+export interface Options {
+	/** Attach a hook that is invoked whenever a VNode is created. */
+	vnode?(vnode: VNode): void;
+	/** Attach a hook that is invoked immediately before a vnode is unmounted. */
+	unmount?(vnode: VNode): void;
+	/** Attach a hook that is invoked after a vnode has rendered. */
+	diffed?(vnode: VNode): void;
+	event?(e: Event): any;
+	requestAnimationFrame?(callback: () => void): void;
+	debounceRendering?(cb: () => void): void;
+	useDebugValue?(value: string | number): void;
+	_addHookName?(name: string | number): void;
+	__suspenseDidResolve?(vnode: VNode, cb: () => void): void;
+	// __canSuspenseResolve?(vnode: VNode, cb: () => void): void;
+}
+
+export const options: Options;
+
+//
+// Preact helpers
+// -----------------------------------
+export function createRef<T = any>(): RefObject<T>;
+export function toChildArray(
+	children: ComponentChildren
+): Array<VNode | string | number>;
+export function isValidElement(vnode: any): vnode is VNode;
+
+//
+// Context
+// -----------------------------------
+export interface Consumer<T>
+	extends FunctionComponent<{
+		children: (value: T) => ComponentChildren;
+	}> {}
+export interface PreactConsumer<T> extends Consumer<T> {}
+
+export interface Provider<T>
+	extends FunctionComponent<{
+		value: T;
+		children: ComponentChildren;
+	}> {}
+export interface PreactProvider<T> extends Provider<T> {}
+export type ContextType<C extends Context<any>> = C extends Context<infer T>
+	? T
+	: never;
+
+export interface Context<T> {
+	Consumer: Consumer<T>;
+	Provider: Provider<T>;
+	displayName?: string;
+}
+export interface PreactContext<T> extends Context<T> {}
+
+export function createContext<T>(defaultValue: T): Context<T>;

backend/node_modules/preact/src/index.js

@@ -0,0 +1,13 @@
+export { render, hydrate } from './render';
+export {
+	createElement,
+	createElement as h,
+	Fragment,
+	createRef,
+	isValidElement
+} from './create-element';
+export { Component } from './component';
+export { cloneElement } from './clone-element';
+export { createContext } from './create-context';
+export { toChildArray } from './diff/children';
+export { default as options } from './options';

backend/node_modules/preact/src/internal.d.ts

@@ -0,0 +1,156 @@
+import * as preact from './index';
+
+export enum HookType {
+	useState = 1,
+	useReducer = 2,
+	useEffect = 3,
+	useLayoutEffect = 4,
+	useRef = 5,
+	useImperativeHandle = 6,
+	useMemo = 7,
+	useCallback = 8,
+	useContext = 9,
+	useErrorBoundary = 10,
+	// Not a real hook, but the devtools treat is as such
+	useDebugvalue = 11
+}
+
+export interface DevSource {
+	fileName: string;
+	lineNumber: number;
+}
+
+export interface ErrorInfo {
+	componentStack?: string;
+}
+
+export interface Options extends preact.Options {
+	/** Attach a hook that is invoked before render, mainly to check the arguments. */
+	_root?(
+		vnode: ComponentChild,
+		parent: Element | Document | ShadowRoot | DocumentFragment
+	): void;
+	/** Attach a hook that is invoked before a vnode is diffed. */
+	_diff?(vnode: VNode): void;
+	/** Attach a hook that is invoked after a tree was mounted or was updated. */
+	_commit?(vnode: VNode, commitQueue: Component[]): void;
+	/** Attach a hook that is invoked before a vnode has rendered. */
+	_render?(vnode: VNode): void;
+	/** Attach a hook that is invoked before a hook's state is queried. */
+	_hook?(component: Component, index: number, type: HookType): void;
+	/** Bypass effect execution. Currenty only used in devtools for hooks inspection */
+	_skipEffects?: boolean;
+	/** Attach a hook that is invoked after an error is caught in a component but before calling lifecycle hooks */
+	_catchError(
+		error: any,
+		vnode: VNode,
+		oldVNode: VNode | undefined,
+		errorInfo: ErrorInfo | undefined
+	): void;
+}
+
+export type ComponentChild =
+	| VNode<any>
+	| string
+	| number
+	| boolean
+	| null
+	| undefined;
+export type ComponentChildren = ComponentChild[] | ComponentChild;
+
+export interface FunctionComponent<P = {}> extends preact.FunctionComponent<P> {
+	// Internally, createContext uses `contextType` on a Function component to
+	// implement the Consumer component
+	contextType?: PreactContext;
+
+	// Internally, createContext stores a ref to the context object on the Provider
+	// Function component to help devtools
+	_contextRef?: PreactContext;
+
+	// Define these properties as undefined on FunctionComponent to get rid of
+	// some errors in `diff()`
+	getDerivedStateFromProps?: undefined;
+	getDerivedStateFromError?: undefined;
+}
+
+export interface ComponentClass<P = {}> extends preact.ComponentClass<P> {
+	_contextRef?: any;
+
+	// Override public contextType with internal PreactContext type
+	contextType?: PreactContext;
+}
+
+// Redefine ComponentType using our new internal FunctionComponent interface above
+export type ComponentType<P = {}> = ComponentClass<P> | FunctionComponent<P>;
+
+export interface PreactElement extends HTMLElement {
+	_children?: VNode<any> | null;
+	/** Event listeners to support event delegation */
+	_listeners?: Record<string, (e: Event) => void>;
+
+	// Preact uses this attribute to detect SVG nodes
+	ownerSVGElement?: SVGElement | null;
+
+	// style: HTMLElement["style"]; // From HTMLElement
+
+	data?: string | number; // From Text node
+}
+
+// We use the `current` property to differentiate between the two kinds of Refs so
+// internally we'll define `current` on both to make TypeScript happy
+type RefObject<T> = { current: T | null };
+type RefCallback<T> = { (instance: T | null): void; current: undefined };
+type Ref<T> = RefObject<T> | RefCallback<T>;
+
+export interface VNode<P = {}> extends preact.VNode<P> {
+	// Redefine type here using our internal ComponentType type
+	type: string | ComponentType<P>;
+	props: P & { children: ComponentChildren };
+	ref?: Ref<any> | null;
+	_children: Array<VNode<any>> | null;
+	_parent: VNode | null;
+	_depth: number | null;
+	/**
+	 * The [first (for Fragments)] DOM child of a VNode
+	 */
+	_dom: PreactElement | null;
+	/**
+	 * The last dom child of a Fragment, or components that return a Fragment
+	 */
+	_nextDom: PreactElement | null;
+	_component: Component | null;
+	_hydrating: boolean | null;
+	constructor: undefined;
+	_original: number;
+}
+
+export interface Component<P = {}, S = {}> extends preact.Component<P, S> {
+	// When component is functional component, this is reset to functional component
+	constructor: ComponentType<P>;
+	state: S; // Override Component["state"] to not be readonly for internal use, specifically Hooks
+	base?: PreactElement;
+
+	_dirty: boolean;
+	_force?: boolean;
+	_renderCallbacks: Array<() => void>; // Only class components
+	_stateCallbacks: Array<() => void>; // Only class components
+	_globalContext?: any;
+	_vnode?: VNode<P> | null;
+	_nextState?: S | null; // Only class components
+	/** Only used in the devtools to later dirty check if state has changed */
+	_prevState?: S | null;
+	/**
+	 * Pointer to the parent dom node. This is only needed for top-level Fragment
+	 * components or array returns.
+	 */
+	_parentDom?: PreactElement | null;
+	// Always read, set only when handling error
+	_processingException?: Component<any, any> | null;
+	// Always read, set only when handling error. This is used to indicate at diffTime to set _processingException
+	_pendingError?: Component<any, any> | null;
+}
+
+export interface PreactContext extends preact.Context<any> {
+	_id: string;
+	_defaultValue: any;
+}

backend/node_modules/preact/src/options.js

@@ -0,0 +1,16 @@
+import { _catchError } from './diff/catch-error';
+
+/**
+ * The `option` object can potentially contain callback functions
+ * that are called during various stages of our renderer. This is the
+ * foundation on which all our addons like `preact/debug`, `preact/compat`,
+ * and `preact/hooks` are based on. See the `Options` type in `internal.d.ts`
+ * for a full list of available option hooks (most editors/IDEs allow you to
+ * ctrl+click or cmd+click on mac the type definition below).
+ * @type {import('./internal').Options}
+ */
+const options = {
+	_catchError
+};
+
+export default options;

backend/node_modules/preact/src/render.js

@@ -0,0 +1,75 @@
+import { EMPTY_OBJ } from './constants';
+import { commitRoot, diff } from './diff/index';
+import { createElement, Fragment } from './create-element';
+import options from './options';
+import { slice } from './util';
+
+/**
+ * Render a Preact virtual node into a DOM element
+ * @param {import('./internal').ComponentChild} vnode The virtual node to render
+ * @param {import('./internal').PreactElement} parentDom The DOM element to
+ * render into
+ * @param {import('./internal').PreactElement | object} [replaceNode] Optional: Attempt to re-use an
+ * existing DOM tree rooted at `replaceNode`
+ */
+export function render(vnode, parentDom, replaceNode) {
+	if (options._root) options._root(vnode, parentDom);
+
+	// We abuse the `replaceNode` parameter in `hydrate()` to signal if we are in
+	// hydration mode or not by passing the `hydrate` function instead of a DOM
+	// element..
+	let isHydrating = typeof replaceNode === 'function';
+
+	// To be able to support calling `render()` multiple times on the same
+	// DOM node, we need to obtain a reference to the previous tree. We do
+	// this by assigning a new `_children` property to DOM nodes which points
+	// to the last rendered tree. By default this property is not present, which
+	// means that we are mounting a new tree for the first time.
+	let oldVNode = isHydrating
+		? null
+		: (replaceNode && replaceNode._children) || parentDom._children;
+
+	vnode = (
+		(!isHydrating && replaceNode) ||
+		parentDom
+	)._children = createElement(Fragment, null, [vnode]);
+
+	// List of effects that need to be called after diffing.
+	let commitQueue = [];
+	diff(
+		parentDom,
+		// Determine the new vnode tree and store it on the DOM element on
+		// our custom `_children` property.
+		vnode,
+		oldVNode || EMPTY_OBJ,
+		EMPTY_OBJ,
+		parentDom.ownerSVGElement !== undefined,
+		!isHydrating && replaceNode
+			? [replaceNode]
+			: oldVNode
+			? null
+			: parentDom.firstChild
+			? slice.call(parentDom.childNodes)
+			: null,
+		commitQueue,
+		!isHydrating && replaceNode
+			? replaceNode
+			: oldVNode
+			? oldVNode._dom
+			: parentDom.firstChild,
+		isHydrating
+	);
+
+	// Flush all queued effects
+	commitRoot(commitQueue, vnode);
+}
+
+/**
+ * Update an existing DOM element with data from a Preact virtual node
+ * @param {import('./internal').ComponentChild} vnode The virtual node to render
+ * @param {import('./internal').PreactElement} parentDom The DOM element to
+ * update
+ */
+export function hydrate(vnode, parentDom) {
+	render(vnode, parentDom, hydrate);
+}

backend/node_modules/preact/src/util.js

@@ -0,0 +1,27 @@
+import { EMPTY_ARR } from "./constants";
+
+/**
+ * Assign properties from `props` to `obj`
+ * @template O, P The obj and props types
+ * @param {O} obj The object to copy properties to
+ * @param {P} props The object to copy properties from
+ * @returns {O & P}
+ */
+export function assign(obj, props) {
+	// @ts-ignore We change the type of `obj` to be `O & P`
+	for (let i in props) obj[i] = props[i];
+	return /** @type {O & P} */ (obj);
+}
+
+/**
+ * Remove a child node from its parent if attached. This is a workaround for
+ * IE11 which doesn't support `Element.prototype.remove()`. Using this function
+ * is smaller than including a dedicated polyfill.
+ * @param {Node} node The node to remove
+ */
+export function removeNode(node) {
+	let parentNode = node.parentNode;
+	if (parentNode) parentNode.removeChild(node);
+}
+
+export const slice = EMPTY_ARR.slice;