fix: only export one thing from glob source (#223)

Fixes:

```
node_modules/ipfs-utils/dist/src/files/glob-source.d.ts:2:1 - error TS2309: An export assignment cannot be used in a module with other exported elements.

2 export = _exports;
```

Author: achingbrain

src/files/glob-source.js

@@ -6,19 +6,13 @@ const glob = require('it-glob')
 const Path = require('path')
 const errCode = require('err-code')
 
-/**
- * @typedef {import('ipfs-unixfs').MtimeLike} MtimeLike
- * @typedef {import('../types').GlobSourceOptions} GlobSourceOptions
- * @typedef {import('../types').GlobSourceResult} GlobSourceResult
- */
-
 /**
  * Create an async iterator that yields paths that match requested glob pattern
  *
  * @param {string} cwd - The directory to start matching the pattern in
  * @param {string} pattern - Glob pattern to match
- * @param {GlobSourceOptions} [options] - Optional options
- * @returns {AsyncGenerator<GlobSourceResult, void, unknown>} File objects that match glob
+ * @param {import('../types').GlobSourceOptions} [options] - Optional options
+ * @returns {AsyncGenerator<import('../types').GlobSourceResult, void, unknown>} File objects that match glob
  */
 module.exports = async function * globSource (cwd, pattern, options) {
   options = options || {}