diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c1870cf..3b8aa86 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -10,12 +10,12 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
+          - 16
           - 14
           - 12
-          - 10
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm install
diff --git a/index.d.ts b/index.d.ts
index 9d3cc78..a3af616 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,3 +1,12 @@
+export interface Options {
+	/**
+	Whether [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code) should be counted. They are ignored by default.
+
+	@default false
+	*/
+	readonly countAnsiEscapeCodes?: boolean;
+}
+
 /**
 Get the real length of a string - by correctly counting astral symbols and ignoring [ansi escape codes](https://github.com/sindresorhus/strip-ansi).
 
@@ -5,7 +14,7 @@ Get the real length of a string - by correctly counting astral symbols and ignor
 
 @example
 ```
-import stringLength = require('string-length');
+import stringLength from 'string-length';
 
 '🐴'.length;
 //=> 2
@@ -17,6 +26,4 @@ stringLength('\u001B[1municorn\u001B[22m');
 //=> 7
 ```
 */
-declare function stringLength(string: string): number;
-
-export = stringLength;
+export default function stringLength(string: string, options?: Options): number;
diff --git a/index.js b/index.js
index c2589a2..2ec6c62 100644
--- a/index.js
+++ b/index.js
@@ -1,19 +1,18 @@
-'use strict';
-const stripAnsi = require('strip-ansi');
-const charRegex = require('char-regex');
+import stripAnsi from 'strip-ansi';
+import charRegex from 'char-regex';
 
-const stringLength = string => {
+export default function stringLength(string, {countAnsiEscapeCodes = false} = {}) {
 	if (string === '') {
 		return 0;
 	}
 
-	const strippedString = stripAnsi(string);
+	if (!countAnsiEscapeCodes) {
+		string = stripAnsi(string);
+	}
 
-	if (strippedString === '') {
+	if (string === '') {
 		return 0;
 	}
 
-	return strippedString.match(charRegex()).length;
-};
-
-module.exports = stringLength;
+	return string.match(charRegex()).length;
+}
diff --git a/index.test-d.ts b/index.test-d.ts
index 09d16b9..86cdce0 100644
--- a/index.test-d.ts
+++ b/index.test-d.ts
@@ -1,5 +1,6 @@
 import {expectType} from 'tsd';
-import stringLength = require('.');
+import stringLength from './index.js';
 
 expectType<number>(stringLength('🐴'));
 expectType<number>(stringLength('\u001B[1municorn\u001B[22m'));
+expectType<number>(stringLength('\u001B[1municorn\u001B[22m', {countAnsiEscapeCodes: true}));
diff --git a/package.json b/package.json
index 5acf08f..f34a87b 100644
--- a/package.json
+++ b/package.json
@@ -10,8 +10,10 @@
 		"url": "https://sindresorhus.com"
 	},
 	"engines": {
-		"node": ">=10"
+		"node": ">=12.20"
 	},
+	"type": "module",
+	"exports": "./index.js",
 	"scripts": {
 		"test": "xo && ava && tsd"
 	},
@@ -34,12 +36,12 @@
 		"codes"
 	],
 	"dependencies": {
-		"char-regex": "^1.0.2",
+		"char-regex": "^2.0.0",
 		"strip-ansi": "^6.0.0"
 	},
 	"devDependencies": {
-		"ava": "^3.1.0",
-		"tsd": "^0.11.0",
-		"xo": "^0.25.3"
+		"ava": "^3.15.0",
+		"tsd": "^0.17.0",
+		"xo": "^0.40.2"
 	}
 }
diff --git a/readme.md b/readme.md
index 6156940..cf0e88b 100644
--- a/readme.md
+++ b/readme.md
@@ -13,7 +13,7 @@ $ npm install string-length
 ## Usage
 
 ```js
-const stringLength = require('string-length');
+import stringLength from 'string-length';
 
 '🐴'.length;
 //=> 2
@@ -25,6 +25,21 @@ stringLength('\u001B[1municorn\u001B[22m');
 //=> 7
 ```
 
+## API
+
+### stringLength(string, options?)
+
+#### options
+
+Type: `object`
+
+##### countAnsiEscapeCodes
+
+Type: `boolean`\
+Default: `false`
+
+Whether [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code) should be counted. They are ignored by default.
+
 ## Related
 
 - [string-length-cli](https://github.com/LitoMore/string-length-cli) - CLI for this module
diff --git a/test.js b/test.js
index dcbf97d..7bedaa1 100644
--- a/test.js
+++ b/test.js
@@ -1,9 +1,10 @@
-const test = require('ava');
-const stringLength = require('.');
+import test from 'ava';
+import stringLength from './index.js';
 
 test('get the real length of a string', t => {
 	t.is(stringLength(''), 0);
 	t.is(stringLength('\u001B[1m\u001B[22m'), 0);
+	t.is(stringLength('\u001B[1m\u001B[22m', {countAnsiEscapeCodes: true}), 9);
 	t.is(stringLength('𠀔'), 1);
 	t.is(stringLength('foo𠁐bar𠀃'), 8);
 	t.is(stringLength('あ'), 1);
@@ -11,8 +12,10 @@ test('get the real length of a string', t => {
 	t.is(stringLength('🐴'), 1);
 	t.is(stringLength('𝌆'), 1);
 	t.is(stringLength('\u001B[1mfoo\u001B[22m'), 3);
+	t.is(stringLength('\u001B[1mfoo\u001B[22m', {countAnsiEscapeCodes: true}), 12);
 	t.is(stringLength('❤️'), 1);
 	t.is(stringLength('👊🏽'), 1);
 	t.is(stringLength('🏴󠁧󠁢󠁥󠁮󠁧󠁿❤️谢👪'), 4);
 	t.is(stringLength('\u001B[1m👩‍👧‍👦°✿\u001B[22m'), 3);
+	t.is(stringLength('\u001B[1m👩‍👧‍👦°✿\u001B[22m', {countAnsiEscapeCodes: true}), 12);
 });