chore: release (prerelease) (#1108)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

.changeset/pre.json

@@ -27,6 +27,7 @@
     "nice-ears-shop",
     "ninety-geckos-build",
     "old-ants-fix",
+    "pretty-clocks-guess",
     "rich-pianos-walk",
     "rotten-shirts-fail",
     "smooth-bulldogs-type",

CHANGELOG.md

@@ -1,5 +1,32 @@
 # Changelog
 
+## 4.0.0-prerelease.15
+
+### Major Changes
+
+- 502dbd1: BREAKING: All of our hooks, parsers, preprocessors, transforms, formats, actions, fileHeaders and filters, support async functions as well now. This means that the formatHelpers -> fileHeader helper method is now asynchronous, to support async fileheader functions.
+
+  ```js
+  import StyleDictionary from 'style-dictionary';
+
+  const { fileHeader } = StyleDictionary.formatHelpers;
+
+  StyleDictionary.registerFormat({
+    name: 'custom/css',
+    // this can be async now, usually it is if you use fileHeader format helper, since that now always returns a Promise
+    formatter: async function ({ dictionary, file, options }) {
+      const { outputReferences } = options;
+      return (
+        // this helper is now async! because the user-passed file.fileHeader might be an async function
+        (await fileHeader({ file })) +
+        ':root {\n' +
+        formattedVariables({ format: 'css', dictionary, outputReferences }) +
+        '\n}\n'
+      );
+    },
+  });
+  ```
+
 ## 4.0.0-prerelease.14
 
 ### Minor Changes

package.json

@@ -1,6 +1,6 @@
 {
   "name": "style-dictionary",
-  "version": "4.0.0-prerelease.14",
+  "version": "4.0.0-prerelease.15",
   "description": "Style once, use everywhere. A build system for creating cross-platform styles.",
   "keywords": [
     "style dictionary",