patch: fix(upgrade) bing client (#505)

src/utils/fetch-bg.mjs

@@ -0,0 +1,30 @@
+import Browser from 'webextension-polyfill'
+
+/**
+ * @param {RequestInfo|URL} input
+ * @param {RequestInit=} init
+ * @returns {Promise<Response>}
+ */
+export function fetchBg(input, init) {
+  return new Promise((resolve, reject) => {
+    Browser.runtime
+      .sendMessage({
+        type: 'FETCH',
+        data: { input, init },
+      })
+      .then((messageResponse) => {
+        const [response, error] = messageResponse
+        if (response === null) {
+          reject(error)
+        } else {
+          const body = response.body ? new Blob([response.body]) : undefined
+          resolve(
+            new Response(body, {
+              status: response.status,
+              statusText: response.statusText,
+            }),
+          )
+        }
+      })
+  })
+}