1 files changed, 97 insertions, 0 deletions
diff --git a/preact/src/create-element.js b/preact/src/create-element.js
new file mode 100644
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+++ b/preact/src/create-element.js
@@ -0,0 +1,97 @@
+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
+	};
+
+	if (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;