feat(dom-to-react): support Preact

Author: David Bailey

README.md

@@ -194,6 +194,18 @@ parse('<p><br id="remove"></p>', {
 });
 ```
 
+### library
+
+The `library` option allows you to specify which component library is used to create elements (currently either React or Preact). React is used by default if this option is not specified, or if the given option is unknown.
+
+Here's an example showing how to use Preact:
+
+```js
+parse('<br>', {
+  library: 'preact'
+});
+```
+
 ## FAQ
 
 #### Is this library XSS safe?

lib/dom-to-react.js

@@ -1,10 +1,21 @@
-var React = require('react');
 var attributesToProps = require('./attributes-to-props');
 var utilities = require('./utilities');
 
-var cloneElement = React.cloneElement;
-var createElement = React.createElement;
-var isValidElement = React.isValidElement;
+/**
+ * Requires the appropriate component library (React or Preact).
+ *
+ * @param  {Object} [options] - The additional options.
+ * @return {Object}
+ */
+function requireReact(options) {
+  options = options || {};
+
+  if (options.library === 'preact') {
+    return require('preact');
+  }
+
+  return require('react');
+}
 
 /**
  * Converts DOM nodes to React elements.
@@ -15,6 +26,12 @@ var isValidElement = React.isValidElement;
  * @return {ReactElement|Array}
  */
 function domToReact(nodes, options) {
+  var React = requireReact(options);
+
+  var cloneElement = React.cloneElement;
+  var createElement = React.createElement;
+  var isValidElement = React.isValidElement;
+
   options = options || {};
   var result = [];
   var node;