Fix Rollup by removing recursion

Closes GH-3.

Author: wooorm

lib/all.js

@@ -3,7 +3,7 @@
  * @typedef {import('./index.js').State} State
  */
 
-import {all} from './all.js'
+import {all} from './one.js'
 import {name} from './name.js'
 import {value} from './value.js'
 

lib/element.js

@@ -1,14 +1,16 @@
 /**
+ * @typedef {import('unist').Parent} UnistParent
  * @typedef {import('xast').Root} Root
  * @typedef {import('xast').RootChildMap} RootChildMap
  * @typedef {import('./index.js').State} State
  */
 
 /**
  * @typedef {Root | RootChildMap[keyof RootChildMap]} Node
+ * @typedef {Extract<Node, UnistParent>} Parent
+ * @typedef {Parent['children'][number]} Child
  */
 
-import {all} from './all.js'
 import {element} from './element.js'
 import {text} from './text.js'
 import {comment} from './comment.js'
@@ -57,3 +59,27 @@ export function one(node, state) {
 
   return result
 }
+
+/**
+ * Serialize all children of `parent`.
+ *
+ * @param {Parent} parent
+ *   xast parent node.
+ * @param {State} state
+ *   Info passed around about the current state.
+ * @returns {string}
+ *   Serialized XML.
+ */
+export function all(parent, state) {
+  /** @type {Array<Child>} */
+  const children = (parent && parent.children) || []
+  let index = -1
+  /** @type {Array<string>} */
+  const results = []
+
+  while (++index < children.length) {
+    results[index] = one(children[index], state)
+  }
+
+  return results.join('')
+}