[[名前付きimport (ESM)|名前付きimport]]でインポートできる[[export (ESM)|export]]形式。`default`キーワードを使う。
```js
const name = "tatsuwo";
export default name;
// import name from "./libs.js";
```
```js
export default function hello() {
console.log("hello");
}
// import hello from "./libs.js";
```
```js
function hello() {
console.log("hello");
}
export default hello;
// import hello from "./libs.js";
```
```js
function hello() {
console.log("hello");
}
export { hello as default };
// import hello from "./libs.js";
```