Format emojis in the service worker directly

web/src/app/notificationUtils.js

@@ -0,0 +1,35 @@
+// This is a separate file since the other utils import `config.js`, which depends on `window`
+// and cannot be used in the service worker
+
+import emojisMapped from "./emojisMapped";
+
+const toEmojis = (tags) => {
+  if (!tags) return [];
+  return tags.filter((tag) => tag in emojisMapped).map((tag) => emojisMapped[tag]);
+};
+
+export const formatTitle = (m) => {
+  const emojiList = toEmojis(m.tags);
+  if (emojiList.length > 0) {
+    return `${emojiList.join(" ")} ${m.title}`;
+  }
+  return m.title;
+};
+
+export const formatTitleWithDefault = (m, fallback) => {
+  if (m.title) {
+    return formatTitle(m);
+  }
+  return fallback;
+};
+
+export const formatMessage = (m) => {
+  if (m.title) {
+    return m.message;
+  }
+  const emojiList = toEmojis(m.tags);
+  if (emojiList.length > 0) {
+    return `${emojiList.join(" ")} ${m.message}`;
+  }
+  return m.message;
+};