Add defaultHandlers export for reusing

Closes GH-67.
Closes GH-68.
Closes GH-69.

Reviewed-by: Christian Murphy <christian.murphy.42@gmail.com>
Reviewed-by: Titus Wormer <tituswormer@gmail.com>

Author: JounQin

index.js

@@ -5,4 +5,4 @@
  * @typedef {import('./lib/types.js').Handle} Handle
  */
 
-export {one, all, toMdast} from './lib/index.js'
+export {one, all, defaultHandlers, toMdast} from './lib/index.js'

lib/index.js

@@ -21,6 +21,7 @@ import {own} from './util/own.js'
 
 export {one} from './one.js'
 export {all} from './all.js'
+export {handlers as defaultHandlers}
 
 const block = convert(['heading', 'paragraph', 'root'])
 

test/index.js

@@ -18,7 +18,7 @@ import rehypeStringify from 'rehype-parse'
 import remarkStringify from 'remark-stringify'
 import {assert} from 'mdast-util-assert'
 import {removePosition} from 'unist-util-remove-position'
-import {one, all, toMdast} from '../index.js'
+import {one, all, defaultHandlers, toMdast} from '../index.js'
 
 const fixtures = path.join('test', 'fixtures')
 
@@ -27,6 +27,8 @@ test('exports', (t) => {
 
   t.assert(all, 'should export `all`')
 
+  t.assert(defaultHandlers, 'should export `defaultHandlers`')
+
   t.end()
 })