Require Node.js 16 and improve length calculation (#17)

Author: Richienb

.github/workflows/main.yml

@@ -10,10 +10,11 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
+          - 18
           - 16
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm install

index.js

@@ -1,5 +1,6 @@
 import stripAnsi from 'strip-ansi';
-import charRegex from 'char-regex';
+
+const segmenter = new Intl.Segmenter();
 
 export default function stringLength(string, {countAnsiEscapeCodes = false} = {}) {
 	if (string === '') {
@@ -14,5 +15,11 @@ export default function stringLength(string, {countAnsiEscapeCodes = false} = {}
 		return 0;
 	}
 
-	return string.match(charRegex()).length;
+	let length = 0;
+
+	for (const _ of segmenter.segment(string)) { // eslint-disable-line no-unused-vars
+		length++;
+	}
+
+	return length;
 }

package.json

@@ -11,7 +11,7 @@
 		"url": "https://sindresorhus.com"
 	},
 	"engines": {
-		"node": ">=12.20"
+		"node": ">=16"
 	},
 	"type": "module",
 	"exports": "./index.js",
@@ -37,7 +37,6 @@
 		"codes"
 	],
 	"dependencies": {
-		"char-regex": "^2.0.0",
 		"strip-ansi": "^7.0.1"
 	},
 	"devDependencies": {