When there is only a single export from a module, prefer using default export over named export.
The following patterns are considered warnings:
```javascript // bad.js
// There is only a single module export and it's a named export. export const foo = 'foo';
```
The following patterns are not warnings:
```javascript // good1.js
// There is a default export. export const foo = 'foo'; const bar = 'bar'; export default 'bar'; ```
```javascript // good2.js
// There is more than one named export in the module. export const foo = 'foo'; export const bar = 'bar'; ```
```javascript // good3.js
// There is more than one named export in the module const foo = 'foo'; const bar = 'bar'; export { foo, bar } ```
```javascript // good4.js
// There is a default export. const foo = 'foo'; export { foo as default } ```
```javascript // export-star.js
// Any batch export will disable this rule. The remote module is not inspected. export * from './other-module' ```