1 files changed, 43 insertions, 0 deletions
diff --git a/comm/mail/components/storybook/.storybook/preview.mjs b/comm/mail/components/storybook/.storybook/preview.mjs
new file mode 100644
index 0000000000..6b654c6049
--- /dev/null
+++ b/comm/mail/components/storybook/.storybook/preview.mjs
@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { DOMLocalization } from "@fluent/dom";
+import { FluentBundle, FluentResource } from "@fluent/bundle";
+
+// Base Fluent set up.
+let storybookBundle = new FluentBundle("en-US");
+let loadedResources = new Set();
+function* generateBundles() {
+  yield* [storybookBundle];
+}
+document.l10n = new DOMLocalization([], generateBundles);
+document.l10n.connectRoot(document.documentElement);
+
+// Any fluent imports should go through MozXULElement.insertFTLIfNeeded.
+window.MozXULElement = {
+  async insertFTLIfNeeded(name) {
+    if (loadedResources.has(name)) {
+      return;
+    }
+    //TODO might have to dynamically change this depending on where a component
+    // lives in the tree (for example for calendar or mailnews).
+    // eslint-disable-next-line no-unsanitized/method
+    let imported = await import(
+      /* webpackInclude: /.*[\/\\].*\.ftl/ */
+      `mail/locales/en-US/${name}`
+    );
+    let ftlContents = imported.default;
+
+    if (loadedResources.has(name)) {
+      // Seems possible we've attempted to load this twice before the first call
+      // resolves, so once the first load is complete we can abandon the others.
+      return;
+    }
+
+    let ftlResource = new FluentResource(ftlContents);
+    storybookBundle.addResource(ftlResource);
+    loadedResources.add(name);
+    document.l10n.translateRoots();
+  },
+};