preact-lib-utils.js

import { h, options } from 'preact';

const X = 'props' in h('a');

export const getProps = X ? vnode => vnode.props : vnode => vnode.attributes;

export const setProps = X
  ? (vnode, props) => { vnode.props = props; }
  : (vnode, props) => { vnode.attributes = props; };

export const getType = X ? vnode => vnode.type : vnode => vnode.nodeName;

export const getChild = X ? vnode => vnode.props.children : vnode => vnode.children[0];

/**
 * Install a plugin hook into Preact.
 * @example
 *   hook('vnode', (old, vnode) => {
 *     const props = getProps(vnode);
 *     if (props) props.foo = 'bar';
 *     old(vnode)
 *   });
 */
export const hook = (type, fn) => { options[hook] = fn.bind(null, options[hook]); };