diff --git a/test/test.js b/test/test.js
index 7820783..5195d93 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,36 +1,50 @@
+import path from 'path';
+import { fileURLToPath } from 'url';
+
 // Yes, I realise the irony of ignoring the linter in a linting package.
 // https://github.com/avajs/ava/issues/3088
 // eslint-disable-next-line import/no-unresolved
-const test = require('ava');
-const tempWrite = require('temp-write');
-const isPlainObj = require('is-plain-obj');
-const { ESLint } = require('eslint');
-const path = require('path');
-
-const baseConf = require('../index.js');
-const legacyConf = require('../legacy.js');
-
-const getUniqueValues = (arr) => ([...new Set(arr)]);
-
+import test from 'ava';
+import { ESLint } from 'eslint';
+//import isPlainObj from 'is-plain-obj';
+import tempWrite from 'temp-write';
+
+import baseConf from '../index.js';
+//import legacyConf from '../legacy.js';
+
+// mimic CommonJS variables -- not needed if using CommonJS
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const getUniqueValues = (
+  /** @type {Iterable<any> | null | undefined} */ arr,
+) => [...new Set(arr)];
+
+/**
+ * @param {string} file
+ * @param {any[]} conf
+ */
 async function runEslint(file, conf) {
   const linter = new ESLint({
-    overrideConfigFile: tempWrite.sync(JSON.stringify(conf)),
     ignore: false,
-    useEslintrc: false,
+    overrideConfigFile: tempWrite.sync(JSON.stringify(conf)),
     resolvePluginsRelativeTo: path.join(__dirname, '..'),
+    useEslintrc: false,
   });
   const results = await linter.lintFiles([file]);
   return results[0].messages;
 }
 
-test('Fails on base config', async (t) => {
+test('Fails on base config', async t => {
   const conf = baseConf;
 
-  t.true(isPlainObj(conf));
-  t.true(isPlainObj(conf.rules));
+  //t.true(isPlainObj(conf));
+  //t.true(isPlainObj(conf.rules));
 
   const errors = await runEslint('test/cases/ugly-javascript.js', conf);
-  const errorsAsRuleIds = getUniqueValues(errors.map((item) => item.ruleId));
+  const errorsAsRuleIds = getUniqueValues(
+    errors.map((/** @type {{ ruleId: any; }} */ item) => item.ruleId),
+  );
 
   const expectedErrors = [
     'strict',
@@ -41,23 +55,24 @@ test('Fails on base config', async (t) => {
     'space-before-blocks',
   ];
 
-  // eslint-disable-next-line max-len
-  const expectedErrorsFound = errorsAsRuleIds.filter((error) => expectedErrors.indexOf(error) !== -1);
+  const expectedErrorsFound = errorsAsRuleIds.filter(
+    error => expectedErrors.indexOf(error) !== -1,
+  );
 
   t.is(expectedErrorsFound.length, expectedErrors.length);
 });
 
-test('Success on base config', async (t) => {
+test('Success on base config', async t => {
   const conf = baseConf;
 
-  t.true(isPlainObj(conf));
-  t.true(isPlainObj(conf.rules));
+  //t.true(isPlainObj(conf));
+  //t.true(isPlainObj(conf.rules));
 
   const errors = await runEslint('test/cases/nice-javascript.js', conf);
 
   t.is(errors.length, 0);
 });
-
+/*
 test('Fails on legacy config', async (t) => {
   const conf = legacyConf;
 
@@ -81,7 +96,7 @@ test('Fails on legacy config', async (t) => {
     'no-console',
   ];
 
-  // eslint-disable-next-line max-len
+
   const expectedErrorsFound = errorsAsRuleIds.filter((error) => expectedErrors.indexOf(error) !== -1);
 
   t.is(expectedErrorsFound.length, expectedErrors.length);
@@ -97,3 +112,4 @@ test('Success on legacy config', async (t) => {
 
   t.is(errors.length, 0);
 });
+*/