line-bot-sdk-nodejs を typescript で使う

	npm install --save express
	npm install --save typescript
        npm install --save @line/bot-sdk
	npm install --save @types/express
	npm install --save @types/node

	npm install --save-dev ts-node
	npm install --save-dev ts-node-dev

	npx tsc --init

	mkdir src
	touch src/index.ts

	npx ts-node src/index.ts

とかでセットアップして

npx ts-node-dev --respawn src/index.ts

で起動。

コードはこんな感じ(typescript 慣れてないから怪しい)。

import line = require('@line/bot-sdk');
import express = require('express');


const config: line.Config =  {
  channelAccessToken: process.env.LINE_CHANNEL_ACCESS_TOKEN!,
  channelSecret: process.env.LINE_CHANNEL_SECRET!,
};

// create LINE SDK client
const client = new line.Client(<line.ClientConfig>config);

// create Express app
// about Express itself: https://expressjs.com/
const app = express();

// register a webhook handler with middleware
// about the middleware, please refer to doc
app.post('/callback', line.middleware(<line.MiddlewareConfig>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
function handleEvent(event: line.WebhookEvent) {
  if (event.type !== 'message' || event.message.type !== 'text') {
    // ignore non-text-message event
    return Promise.resolve(null);
  }

  console.log(`Received message: ${event.message.text}`);

  // create a echoing text message
  const echo: line.TextMessage = { type: 'text', text: event.message.text };

  // use reply API
  return client.replyMessage(event.replyToken, echo);
}

// listen on port
const port = process.env.PORT || 3000;
app.listen(port, () => {
  console.log(`listening on ${port}`);
});

Published: 2019-05-07(Tue) 17:35