diff --git a/lib/index.js b/lib/index.js
index 7f9093b..7720690 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,8 +1,8 @@
 /**
- * @typedef {import('vfile').VFile} VFile
- * @typedef {import('vfile-message').VFileMessage} VFileMessage
  * @typedef {import('eslint').ESLint.LintResult} LintResult
  * @typedef {import('eslint').Linter.LintMessage} LintMessage
+ * @typedef {import('vfile').VFile} VFile
+ * @typedef {import('vfile-message').VFileMessage} VFileMessage
  */
 
 import {statistics} from 'vfile-statistics'
@@ -17,7 +17,9 @@ import {statistics} from 'vfile-statistics'
  *   Lint results.
  */
 export function toESLint(files) {
-  return files.map((x) => file(x))
+  return files.map(function (file) {
+    return transformFile(file)
+  })
 }
 
 /**
@@ -28,12 +30,14 @@ export function toESLint(files) {
  * @returns {LintResult}
  *   ESLint result.
  */
-function file(file) {
+function transformFile(file) {
   const stats = statistics(file)
 
   return {
     filePath: file.path,
-    messages: file.messages.map((x) => message(x)),
+    messages: file.messages.map(function (message) {
+      return transformMessage(message)
+    }),
     fatalErrorCount: stats.fatal,
     errorCount: stats.fatal,
     warningCount: stats.nonfatal,
@@ -52,9 +56,10 @@ function file(file) {
  * @returns {LintMessage}
  *   ESLint message.
  */
-function message(x) {
+function transformMessage(x) {
   /* c8 ignore next */
   const end = x.position ? x.position.end : {line: undefined, column: undefined}
+
   return {
     fatal: x.fatal === true ? true : undefined,
     severity: x.fatal ? 2 : 1,
diff --git a/test.js b/test.js
index a7eb6c4..839e4d0 100644
--- a/test.js
+++ b/test.js
@@ -2,11 +2,10 @@ import assert from 'node:assert/strict'
 import test from 'node:test'
 import {VFile} from 'vfile'
 import {toESLint} from './index.js'
-import * as mod from './index.js'
 
-test('toESLint', () => {
+test('toESLint', async function () {
   assert.deepEqual(
-    Object.keys(mod).sort(),
+    Object.keys(await import('./index.js')).sort(),
     ['toESLint'],
     'should expose the public api'
   )