Refactored, added es5 build

src/index.js

@@ -0,0 +1,28 @@
+import Vue    from 'vue'
+import Modal  from './Modal.vue'
+
+const ModalPlugin = {
+  install(Vue, options = {}) {
+    if (!this.hasOwnProperty("event")) {
+      this.event = new Vue()
+    }
+
+    const $modal = {
+      show(name, params) {
+        ModalPlugin.event.$emit('toggle', name, true, params)
+      },
+      hide(name, params) {
+        ModalPlugin.event.$emit('toggle', name, false, params)
+      }
+    }
+
+    Object.defineProperty(Vue.prototype, '$modal', {
+      get: () => $modal
+    })
+
+    Vue.component('modal', Modal)
+    return null
+  },
+}
+
+export default ModalPlugin