docker + node.jsでe6を試したメモ

babel-nodeを利用して、node.jsでもes6の記法を使えるようにする。
node_modulesをignoreから外す。*

環境

• docker17.03.0-ce
• ubuntu-16.04(仮想環境)
• vagrant1.9.2
• virtual box 5.1.18
• windows10

ディレクトリ構造

- express
  - Dockerfile
  - package.json
  - .babelrc
- project
  - src
    - app
      - app.js 
      - bin
        - www
- docker-compose.yml

ファイル

express/Dockerfile

FROM node:7.7.3
WORKDIR /express/app
RUN npm init -y
RUN npm install babel-cli --save
RUN npm install express@5.0.0-alpha.5 --save
RUN npm install babel-preset-latest --save-dev

express/package.json

{
  "name": "app",
  "version": "1.0.0",
  "description": "",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "babel-node ./bin/www"
  },
  "dependencies": {
    "babel-cli": "^6.24.0",
    "express": "^5.0.0-alpha.5"
  },
  "devDependencies": {
    "babel-preset-latest": "^6.24.0"
  }
}

express/.babelrc

{
  "ignore": [],
  "presets": ["latest"]
}

docker-compose.yml

version: '2'
services:
  express:
    build: ./express
    volumes:
    - ./express/package.json:/express/app/package.json
    - ./express/.babelrc:/express/app/.babelrc
    - ./project/src/app/bin:/express/app/bin
    - ./project/src/app/app.js:/express/app/app.js
    ports:
      - "3000:3000"
    command: [npm, run, start]

project/src/app/app.js

import express from 'express';

const app = express();

app.get('/', (req, res) => {
  res.send('Hello World!');
});

module.exports = app;

project/src/app/bin/www

#!/usr/bin/env node

import app from '../app';
import debug_module from 'debug';
import http from 'http';

const debug = debug_module('wmfwapp:server');

const port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

const server = http.createServer(app);

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

function normalizePort(val) {
  const port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  const bind = typeof port === 'string'
    ? `Pipe ${port}`
    : `Port ${port}`;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(`${bind} requires elevated privileges`);
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(`${bind} is already in use`);
      process.exit(1);
      break;
    default:
      throw error;
  }
}

function onListening() {
  const addr = server.address();
  const bind = typeof addr === 'string'
    ? `pipe ${addr}`
    : `port ${addr.port}`;
  debug(`Listening on ${bind}`);
}

参考

ECMAScript6でNode.jsを動かす - babel-node
babel-presets
babel-node