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Javascript 備忘録8<モジュール>

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■モジュールについて
→モジュールには2種類存在する
→ESMとCJS

■ESMとCJSの比較
→ESMはimport/exportを使用
→CJSはrequire/exportsを使用

■EMでモジュールを使用する

moduleA.js
export let hello = 'hello';

export function helloFn() {
    console.log('hello')
}
moduleB.js
// 別のモジュールからimportする
import { hello, helloFn } from './moduleA.js';
// 下のように as を使用して別の変数名にすることが可能
import { hello as ya, helloFn as fn }from './moduleA.js';

// 変数と関数が使用できるようになる
console.log(hello);
helloFn();
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