質問編集履歴

補足を追記

2020/06/28 01:20

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@@ -203,3 +203,101 @@
 }
 ```
+###補足
+下記のプログラムが同じindex.jsファイルに書かれていますが、こちらは動作します。
+```
+'use strict';
+const functions = require('firebase-functions');
+const express = require('express');
+const line = require('@line/bot-sdk');
+// channel secretとaccess tokenをFirebaseの環境変数から呼び出す
+const config = {
+    channelSecret: functions.config().channel.secret,
+    channelAccessToken: functions.config().channel.accesstoken
+}
+// create LINE SDK client
+const client = new line.Client(config);
+// create Express app
+const app = express();
+// register a webhook handler with middleware
+app.post('/webhook', line.middleware(config), (req, res) => {
+    Promise
+      .all(req.body.events.map(handleEvent))
+      .then((result) => res.json(result))
+      .catch((err) => {
+      console.error(err);
+      res.status(500).end();
+    });
+});
+// event handler
+async function handleEvent(event) {
+  if (event.type !== 'message' || event.message.type !== 'text') {
+    // ignore non-text-message event
+    return Promise.resolve(null);
+  }
+  // create a echoing text message
+  const echo = { type: 'text', text: event.message.text };
+  // use reply API
+  return client.replyMessage(event.replyToken, echo );
+}
+exports.app = functions.https.onRequest(app);
+```