1 files changed, 31 insertions, 0 deletions
diff --git a/browser/extensions/screenshots/selector/callBackground.js b/browser/extensions/screenshots/selector/callBackground.js
new file mode 100644
index 0000000000..3fb8734c38
--- /dev/null
+++ b/browser/extensions/screenshots/selector/callBackground.js
@@ -0,0 +1,31 @@
+/* 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/. */
+
+/* globals log */
+
+"use strict";
+
+this.callBackground = function callBackground(funcName, ...args) {
+  return browser.runtime.sendMessage({funcName, args}).then((result) => {
+    if (result && result.type === "success") {
+      return result.value;
+    } else if (result && result.type === "error") {
+      const exc = new Error(result.message || "Unknown error");
+      exc.name = "BackgroundError";
+      if ("errorCode" in result) {
+        exc.errorCode = result.errorCode;
+      }
+      if ("popupMessage" in result) {
+        exc.popupMessage = result.popupMessage;
+      }
+      throw exc;
+    } else {
+      log.error("Unexpected background result:", result);
+      const exc = new Error(`Bad response type from background page: ${result && result.type || undefined}`);
+      exc.resultType = result ? (result.type || "undefined") : "undefined result";
+      throw exc;
+    }
+  });
+};
+null;