diff --git a/.eslintrc b/.eslintrc
index 9ad7ef5..758ff12 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,7 +1,7 @@
 {
 	"root": true,
 
-	"extends": "@ljharb/eslint-config/node/6",
+	"extends": "@ljharb",
 
 	"overrides": [
 		{
diff --git a/.github/workflows/node-aught.yml b/.github/workflows/node-aught.yml
index ee6cbc2..f3cddd8 100644
--- a/.github/workflows/node-aught.yml
+++ b/.github/workflows/node-aught.yml
@@ -6,7 +6,7 @@ jobs:
   tests:
     uses: ljharb/actions/.github/workflows/node.yml@main
     with:
-      range: '>= 6 < 10'
+      range: '< 10'
       type: minors
       command: npm run tests-only
 
diff --git a/index.js b/index.js
index 54f0f67..65c159a 100644
--- a/index.js
+++ b/index.js
@@ -1,31 +1,41 @@
 'use strict';
 
-const hasOwn = (obj, key) => Object.prototype.hasOwnProperty.call(obj, key);
-const isObject = (val) => val !== null && typeof val === 'object' && !Array.isArray(val);
+var hasOwn = function (obj, key) {
+	return Object.prototype.hasOwnProperty.call(obj, key);
+};
+var isObject = function (val) {
+	return val !== null && typeof val === 'object' && !Array.isArray(val);
+};
 
-const isDescriptor = (obj, key) => {
+module.exports = function isDataDescriptor(obj, key) {
 	if (!isObject(obj)) {
 		return false;
 	}
-	const desc = key ? Object.getOwnPropertyDescriptor(obj, key) : obj;
+	var desc = key ? Object.getOwnPropertyDescriptor(obj, key) : obj;
 	if (isObject(desc)) {
-		const booleans = [
-			'configurable', 'enumerable', 'writable',
-		];
-		if (!hasOwn(desc, 'value') || hasOwn(desc, 'get') || hasOwn(desc, 'set')) {
+		if (
+			!hasOwn(desc, 'value')
+			|| hasOwn(desc, 'get')
+			|| hasOwn(desc, 'set')
+			|| (hasOwn(desc, 'configurable') && typeof desc.configurable !== 'boolean')
+			|| (hasOwn(desc, 'enumerable') && typeof desc.enumerable !== 'boolean')
+			|| (hasOwn(desc, 'writable') && typeof desc.writable !== 'boolean')
+		) {
 			return false;
 		}
-		for (const descKey of Object.keys(desc)) {
-			if (booleans.includes(descKey) && typeof desc[descKey] !== 'boolean') {
-				return false;
-			}
-			if (!booleans.includes(descKey) && descKey !== 'value') {
+		for (var descKey in desc) { // eslint-disable-line no-restricted-syntax
+			if (
+				hasOwn(desc, descKey)
+				&& descKey !== 'configurable'
+				&& descKey !== 'enumerable'
+				&& descKey !== 'writable'
+				&& descKey !== 'value'
+			) {
 				return false;
 			}
 		}
+
 		return true;
 	}
 	return false;
 };
-
-module.exports = isDescriptor;
diff --git a/package.json b/package.json
index 03ad64d..c9e8460 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,7 @@
 		"tape": "^5.6.3"
 	},
 	"engines": {
-		"node": ">=6"
+		"node": ">= 0.4"
 	},
 	"auto-changelog": {
 		"output": "CHANGELOG.md",
diff --git a/test/index.js b/test/index.js
index b431593..fa0c04e 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,12 +1,12 @@
 'use strict';
 
-const test = require('tape');
+var test = require('tape');
 
-const isDescriptor = require('../');
-const noop = () => {};
+var isDescriptor = require('../');
+var noop = function () {};
 
-test('isDescriptor', (t) => {
-	t.test('value type: is false when not an object', (st) => {
+test('isDescriptor', function (t) {
+	t.test('value type: is false when not an object', function (st) {
 		st.notOk(isDescriptor('a'));
 		st.notOk(isDescriptor(null));
 		st.notOk(isDescriptor([]));
@@ -14,13 +14,13 @@ test('isDescriptor', (t) => {
 		st.end();
 	});
 
-	t.test('data descriptor:', (st) => {
+	t.test('data descriptor:', function (st) {
 		st.notOk(isDescriptor({ value: 'foo', bar: 'baz' }), 'is false when the object has invalid properties');
 
 		st.notOk(isDescriptor({ value: 'foo', get: noop }), 'is false when the object has get or set properties');
 		st.notOk(isDescriptor({ get: noop, value: noop }), 'is false when the object has get or set properties');
 
-		st.test('is false when the object has invalid properties and strict is true', (s2t) => {
+		st.test('is false when the object has invalid properties and strict is true', function (s2t) {
 			s2t.notOk(isDescriptor({ value: 'foo', bar: 'baz' }));
 			s2t.notOk(isDescriptor({ value: 'foo', bar: 'baz' }));
 			s2t.notOk(isDescriptor({ value: 'foo', get: noop }));
@@ -29,14 +29,14 @@ test('isDescriptor', (t) => {
 			s2t.end();
 		});
 
-		st.test('is true when the object has valid data-descriptor properties', (s2t) => {
+		st.test('is true when the object has valid data-descriptor properties', function (s2t) {
 			s2t.ok(isDescriptor({ value: 'foo' }));
 			s2t.ok(isDescriptor({ value: noop }));
 
 			s2t.end();
 		});
 
-		st.test('is false when valid properties are invalid types', (s2t) => {
+		st.test('is false when valid properties are invalid types', function (s2t) {
 			s2t.notOk(isDescriptor({ value: 'foo', enumerable: 'foo' }));
 			s2t.notOk(isDescriptor({ value: 'foo', configurable: 'foo' }));
 			s2t.notOk(isDescriptor({ value: 'foo', writable: 'foo' }));
@@ -44,7 +44,7 @@ test('isDescriptor', (t) => {
 			s2t.end();
 		});
 
-		st.test('should be true when a value is a valid data descriptor', (s2t) => {
+		st.test('should be true when a value is a valid data descriptor', function (s2t) {
 			s2t.ok(isDescriptor({ value: 'foo' }));
 			s2t.notOk(isDescriptor({ writable: true }));
 			s2t.notOk(isDescriptor({ value: 'foo', get: 'foo' }));
@@ -52,7 +52,7 @@ test('isDescriptor', (t) => {
 			s2t.end();
 		});
 
-		st.test('is false when descriptor has an in-valid propery and "strict" is true', (s2t) => {
+		st.test('is false when descriptor has an in-valid propery and "strict" is true', function (s2t) {
 			s2t.ok(isDescriptor({ value: 'foo' }));
 			s2t.notOk(isDescriptor({ writable: true }, void undefined, true));
 			s2t.notOk(isDescriptor({ value: 'foo', get: 'foo' }, void undefined, true));
@@ -60,7 +60,7 @@ test('isDescriptor', (t) => {
 			s2t.end();
 		});
 
-		st.test('should be false when the value is not a valid descriptor', (s2t) => {
+		st.test('should be false when the value is not a valid descriptor', function (s2t) {
 			s2t.notOk(isDescriptor('foo'));
 			s2t.notOk(isDescriptor({}));
 			s2t.notOk(isDescriptor({ configurable: true }));
@@ -69,7 +69,7 @@ test('isDescriptor', (t) => {
 				get: undefined,
 				set: undefined,
 				enumerable: true,
-				configurable: true,
+				configurable: true
 			}));
 
 			s2t.end();