1 files changed, 77 insertions, 0 deletions
diff --git a/preact/jsx-runtime/src/index.js b/preact/jsx-runtime/src/index.js
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+++ b/preact/jsx-runtime/src/index.js
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+import { options, Fragment } from 'preact';
+
+/** @typedef {import('preact').VNode} VNode */
+
+let vnodeId = 0;
+
+/**
+ * @fileoverview
+ * This file exports various methods that implement Babel's "automatic" JSX runtime API:
+ * - jsx(type, props, key)
+ * - jsxs(type, props, key)
+ * - jsxDEV(type, props, key, __source, __self)
+ *
+ * The implementation of createVNode here is optimized for performance.
+ * Benchmarks: https://esbench.com/bench/5f6b54a0b4632100a7dcd2b3
+ */
+
+/**
+ * JSX.Element factory used by Babel's {runtime:"automatic"} JSX transform
+ * @param {VNode['type']} type
+ * @param {VNode['props']} props
+ * @param {VNode['key']} [key]
+ * @param {string} [__source]
+ * @param {string} [__self]
+ */
+function createVNode(type, props, key, __source, __self) {
+	// We'll want to preserve `ref` in props to get rid of the need for
+	// forwardRef components in the future, but that should happen via
+	// a separate PR.
+	let normalizedProps = {},
+		ref,
+		i;
+	for (i in props) {
+		if (i == 'ref') {
+			ref = props[i];
+		} else {
+			normalizedProps[i] = props[i];
+		}
+	}
+
+	const vnode = {
+		type,
+		props: normalizedProps,
+		key,
+		ref,
+		_children: null,
+		_parent: null,
+		_depth: 0,
+		_dom: null,
+		_nextDom: undefined,
+		_component: null,
+		_hydrating: null,
+		constructor: undefined,
+		_original: --vnodeId,
+		__source,
+		__self
+	};
+
+	// If a Component VNode, check for and apply defaultProps.
+	// Note: `type` is often a String, and can be `undefined` in development.
+	if (typeof type === 'function' && (ref = type.defaultProps)) {
+		for (i in ref)
+			if (typeof normalizedProps[i] === 'undefined') {
+				normalizedProps[i] = ref[i];
+			}
+	}
+
+	if (options.vnode) options.vnode(vnode);
+	return vnode;
+}
+
+export {
+	createVNode as jsx,
+	createVNode as jsxs,
+	createVNode as jsxDEV,
+	Fragment
+};