Monkey patch mithril so we can use JSX component syntax

<Alert foo="bar"/> instead of Alert.component({foo: 'bar'})

js/lib/App.js

@@ -2,6 +2,7 @@ import ItemList from 'flarum/utils/ItemList';
 import Alert from 'flarum/components/Alert';
 import Translator from 'flarum/Translator';
 import extract from 'flarum/utils/extract';
+import patchMithril from 'flarum/utils/patchMithril';
 
 /**
  * The `App` class provides a container for an application, as well as various
@@ -9,6 +10,8 @@ import extract from 'flarum/utils/extract';
  */
 export default class App {
   constructor() {
+    patchMithril(window);
+
     /**
      * The forum model for this application.
      *

js/lib/utils/patchMithril.js

@@ -0,0 +1,17 @@
+import Component from '../Component';
+
+export default function patchMithril(global) {
+  const mo = global.m;
+
+  const m = function(comp, ...args) {
+    if (comp.prototype && comp.prototype instanceof Component) {
+      return comp.component(...args);
+    }
+
+    return mo.apply(this, arguments);
+  }
+
+  Object.keys(mo).forEach(key => m[key] = mo[key]);
+
+  global.m = m;
+}