Build system integration using vue-cli.

src/components/Message.vue

@@ -0,0 +1,41 @@
+<template>
+  <article v-if="item" class="message" :class="item.style">
+    <div v-if="item.title" class="message-header">
+      <p>{{ item.title }}</p>
+    </div>
+    <div v-if="item.content" class="message-body" v-html="item.content"></div>
+  </article>
+</template>
+
+<script>
+export default {
+  name: "Message",
+  props: {
+    item: Object,
+  },
+  created: function () {
+    // Look for a new message if an endpoint is provided.
+    let that = this;
+    if (this.item && this.item.url) {
+      this.getMessage(this.item.url).then(function (message) {
+        // keep the original config value if no value is provided by the endpoint
+        for (const prop of ["title", "style", "content"]) {
+          if (prop in message && message[prop] !== null) {
+            that.item[prop] = message[prop];
+          }
+        }
+      });
+    }
+  },
+  methods: {
+    getMessage: function (url) {
+      return fetch(url).then(function (response) {
+        if (response.status != 200) {
+          return;
+        }
+        return response.json();
+      });
+    },
+  },
+};
+</script>