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49-01

[1, 2, 3].map(n => n ** n);

49-02

"use strict";

[1, 2, 3].map(function (n) {
  return Math.pow(n, n);
});

49-03

{
  "name": "esnext-project",
  "version": "1.0.0",
  "devDependencies": {
    "@babel/cli": "^7.10.3",
    "@babel/core": "^7.10.3"
  }
}

49-04

{
  "name": "esnext-project",
  "version": "1.0.0",
  "devDependencies": {
    "@babel/cli": "^7.10.3",
    "@babel/core": "^7.10.3",
    "@babel/preset-env": "^7.10.3"
  }
}

49-05

{
  "presets": ["@babel/preset-env"]
}

49-06

{
  "name": "esnext-project",
  "version": "1.0.0",
  "scripts": {
    "build": "babel src/js -w -d dist/js"
  },
  "devDependencies": {
    "@babel/cli": "^7.10.3",
    "@babel/core": "^7.10.3",
    "@babel/preset-env": "^7.10.3"
  }
}

49-07

// src/js/lib.js
export const pi = Math.PI; // ES6 모듈

export function power(x, y) {
  return x ** y; // ES7: 지수 연산자
}

// ES6 클래스
export class Foo {
  #private = 10; // stage 3: 클래스 필드 정의 제안

  foo() {
    // stage 4: 객체 Rest/Spread 프로퍼티 제안
    const { a, b, ...x } = { ...{ a: 1, b: 2 }, c: 3, d: 4 };
    return { a, b, x };
  }

  bar() {
    return this.#private;
  }
}

49-08

// src/js/main.js
import { pi, power, Foo } from './lib';

console.log(pi);
console.log(power(pi, pi));

const f = new Foo();
console.log(f.foo());
console.log(f.bar());

49-09

{
  "name": "esnext-project",
  "version": "1.0.0",
  "scripts": {
    "build": "babel src/js -w -d dist/js"
  },
  "devDependencies": {
    "@babel/cli": "^7.10.3",
    "@babel/core": "^7.10.3",
    "@babel/plugin-proposal-class-properties": "^7.10.1",
    "@babel/preset-env": "^7.10.3"
  }
}

49-10

{
  "presets": ["@babel/preset-env"],
  "plugins": ["@babel/plugin-proposal-class-properties"]
}

49-11

// dist/js/main.js
"use strict";

var _lib = require("./lib");

// src/js/main.js
console.log(_lib.pi);
console.log((0, _lib.power)(_lib.pi, _lib.pi));
var f = new _lib.Foo();
console.log(f.foo());
console.log(f.bar());

49-12

<!DOCTYPE html>
<html>
<body>
  <script src="dist/js/lib.js"></script>
  <script src="dist/js/main.js"></script>
</body>
</html>

49-13

{
  "name": "esnext-project",
  "version": "1.0.0",
  "scripts": {
    "build": "babel src/js -w -d dist/js"
  },
  "devDependencies": {
    "@babel/cli": "^7.10.3",
    "@babel/core": "^7.10.3",
    "@babel/plugin-proposal-class-properties": "^7.10.1",
    "@babel/preset-env": "^7.10.3",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.12"
  }
}

49-14

{
  "name": "esnext-project",
  "version": "1.0.0",
  "scripts": {
    "build": "webpack -w"
  },
  "devDependencies": {
    "@babel/cli": "^7.10.3",
    "@babel/core": "^7.10.3",
    "@babel/plugin-proposal-class-properties": "^7.10.1",
    "@babel/preset-env": "^7.10.3",
    "babel-loader": "^8.1.0",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.12"
  }
}

49-15

const path = require('path');

module.exports = {
  // entry file
  // https://webpack.js.org/configuration/entry-context/#entry
  entry: './src/js/main.js',
  // 번들링된 js 파일의 이름(filename)과 저장될 경로(path)를 지정
  // https://webpack.js.org/configuration/output/#outputpath
  // https://webpack.js.org/configuration/output/#outputfilename
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'js/bundle.js'
  },
  // https://webpack.js.org/configuration/module
  module: {
    rules: [
      {
        test: /\.js$/,
        include: [
          path.resolve(__dirname, 'src/js')
        ],
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env'],
            plugins: ['@babel/plugin-proposal-class-properties']
          }
        }
      }
    ]
  },
  devtool: 'source-map',
  // https://webpack.js.org/configuration/mode
  mode: 'development'
};

49-16

<!DOCTYPE html>
<html>
<body>
  <script src="./dist/js/bundle.js"></script>
</body>
</html>

49-17

// src/js/main.js
import { pi, power, Foo } from './lib';

console.log(pi);
console.log(power(pi, pi));

const f = new Foo();
console.log(f.foo());
console.log(f.bar());

// polyfill이 필요한 코드
console.log(new Promise((resolve, reject) => {
  setTimeout(() => resolve(1), 100);
}));

// polyfill이 필요한 코드
console.log(Object.assign({}, { x: 1 }, { y: 2 }));

// polyfill이 필요한 코드
console.log(Array.from([1, 2, 3], v => v + v));

49-18

...
// 190 line
console.log(new Promise(function (resolve, reject) {
  setTimeout(function () {
    return resolve(1);
  }, 100);
})); // polyfill이 필요한 코드

console.log(Object.assign({}, {
  x: 1
}, {
  y: 2
})); // polyfill이 필요한 코드

console.log(Array.from([1, 2, 3], function (v) {
  return v + v;
}));
...

49-19

{
  "name": "esnext-project",
  "version": "1.0.0",
  "scripts": {
    "build": "webpack -w"
  },
  "devDependencies": {
    "@babel/cli": "^7.10.3",
    "@babel/core": "^7.10.3",
    "@babel/plugin-proposal-class-properties": "^7.10.1",
    "@babel/preset-env": "^7.10.3",
    "babel-loader": "^8.1.0",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.12"
  },
  "dependencies": {
    "@babel/polyfill": "^7.10.1"
  }
}

49-20

// src/js/main.js
import "@babel/polyfill";
import { pi, power, Foo } from './lib';
...

49-21

const path = require('path');

module.exports = {
  // entry file
  // https://webpack.js.org/configuration/entry-context/#entry
  entry: ['@babel/polyfill', './src/js/main.js'],
...