# defaultExtensionMap

**Kind:** Constant

**Source:** [`src/helper/ssg/ssg.ts`](https://github.com/honojs/hono/blob/main/src/helper/ssg/ssg.ts#L90)

**Part of:** [Helper](subsystem-src-helper)

## Definition

```ts
Record<string, string>
```

## Value

```ts
{
  'text/html': 'html',
  'text/xml': 'xml',
  'application/xml': 'xml',
  'application/atom+xml': 'xml',
  'application/rss+xml': 'xml',
  'application/yaml': 'yaml',
}
```