Refactor to move implementation to lib/

index.js

@@ -1,48 +1,5 @@
 /**
- * @typedef {import('hast').Root} Root
+ * @typedef {import('./lib/index.js').Options} Options
  */
 
-/**
- * @typedef Options
- *   Configuration (optional).
- * @property {string} [prefix='']
- *   Prefix to add in front of `id`s (default: `''`).
- */
-
-import GithubSlugger from 'github-slugger'
-import {headingRank} from 'hast-util-heading-rank'
-import {toString} from 'hast-util-to-string'
-import {visit} from 'unist-util-visit'
-
-/** @type {Options} */
-const emptyOptions = {}
-const slugs = new GithubSlugger()
-
-/**
- * Add `id`s to headings.
- *
- * @param {Options | null | undefined} [options]
- *   Configuration (optional).
- * @returns
- *   Transform.
- */
-export default function rehypeSlug(options) {
-  const settings = options || emptyOptions
-  const prefix = settings.prefix || ''
-
-  /**
-   * @param {Root} tree
-   *   Tree.
-   * @returns {undefined}
-   *   Nothing.
-   */
-  return function (tree) {
-    slugs.reset()
-
-    visit(tree, 'element', function (node) {
-      if (headingRank(node) && !node.properties.id) {
-        node.properties.id = prefix + slugs.slug(toString(node))
-      }
-    })
-  }
-}
+export {default} from './lib/index.js'

lib/index.js

@@ -0,0 +1,48 @@
+/**
+ * @typedef {import('hast').Root} Root
+ */
+
+/**
+ * @typedef Options
+ *   Configuration (optional).
+ * @property {string} [prefix='']
+ *   Prefix to add in front of `id`s (default: `''`).
+ */
+
+import GithubSlugger from 'github-slugger'
+import {headingRank} from 'hast-util-heading-rank'
+import {toString} from 'hast-util-to-string'
+import {visit} from 'unist-util-visit'
+
+/** @type {Options} */
+const emptyOptions = {}
+const slugs = new GithubSlugger()
+
+/**
+ * Add `id`s to headings.
+ *
+ * @param {Options | null | undefined} [options]
+ *   Configuration (optional).
+ * @returns
+ *   Transform.
+ */
+export default function rehypeSlug(options) {
+  const settings = options || emptyOptions
+  const prefix = settings.prefix || ''
+
+  /**
+   * @param {Root} tree
+   *   Tree.
+   * @returns {undefined}
+   *   Nothing.
+   */
+  return function (tree) {
+    slugs.reset()
+
+    visit(tree, 'element', function (node) {
+      if (headingRank(node) && !node.properties.id) {
+        node.properties.id = prefix + slugs.slug(toString(node))
+      }
+    })
+  }
+}

package.json

@@ -28,6 +28,7 @@
   "types": "index.d.ts",
   "main": "index.js",
   "files": [
+    "lib/",
     "index.d.ts",
     "index.js"
   ],