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