add unflatten function

Author: Rich-Harris

index.js

@@ -1,3 +1,3 @@
 export { uneval } from './src/uneval.js';
-export { parse } from './src/parse.js';
+export { parse, unflatten } from './src/parse.js';
 export { stringify } from './src/stringify.js';

src/parse.js

@@ -12,8 +12,14 @@ import {
  * @param {string} serialized
  */
 export function parse(serialized) {
-	const parsed = JSON.parse(serialized);
+	return unflatten(JSON.parse(serialized));
+}
 
+/**
+ * Revive a value flattened with `devalue.flatten`
+ * @param {number | any[]} parsed
+ */
+export function unflatten(parsed) {
 	if (typeof parsed === 'number') return hydrate(parsed, true);
 
 	if (!Array.isArray(parsed) || parsed.length === 0) {

test/test.js

@@ -1,7 +1,7 @@
 import * as vm from 'vm';
 import * as assert from 'uvu/assert';
 import * as uvu from 'uvu';
-import { uneval, parse, stringify } from '../index.js';
+import { uneval, unflatten, parse, stringify } from '../index.js';
 
 const fixtures = {
 	basics: [
@@ -406,6 +406,23 @@ for (const [name, tests] of Object.entries(fixtures)) {
 	test.run();
 }
 
+for (const [name, tests] of Object.entries(fixtures)) {
+	const test = uvu.suite(`unflatten: ${name}`);
+	for (const t of tests) {
+		test(t.name, () => {
+			const actual = unflatten(JSON.parse(t.json));
+			const expected = t.value;
+
+			if (t.validate) {
+				t.validate(actual);
+			} else {
+				assert.equal(actual, expected);
+			}
+		});
+	}
+	test.run();
+}
+
 const invalid = [
 	{
 		name: 'empty string',